{"id":12531,"date":"2023-12-31T07:34:12","date_gmt":"2023-12-31T04:04:12","guid":{"rendered":"https:\/\/rasanegar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/"},"modified":"2023-12-31T07:34:12","modified_gmt":"2023-12-31T04:04:12","slug":"%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88","status":"publish","type":"post","link":"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/","title":{"rendered":"\u0686\u06af\u0648\u0646\u0647 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0633\u0631\u0641\u0635\u0644\u0647\u0627\u06cc \u0645\u0637\u0644\u0628<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d9%85%d8%b9%d8%b1%d9%81%db%8c\" >\u0645\u0639\u0631\u0641\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%a7%d8%b1%d8%b2%db%8c%d8%a7%d8%a8%db%8c_%d8%a8%d9%88%d9%84%db%8c_%d8%af%d8%b1_%d9%be%d8%a7%db%8c%d8%aa%d9%88%d9%86\" >\u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0628\u0648\u0644\u06cc \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_%d8%a7%db%8c%d9%86%da%a9%d9%87_%d8%a2%db%8c%d8%a7_%db%8c%da%a9_%d8%b1%d8%b4%d8%aa%d9%87_%d8%ae%d8%a7%d9%84%db%8c_%d8%a7%d8%b3%d8%aa_%db%8c%d8%a7_%d8%ae%db%8c%d8%b1\" >\u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u062e\u06cc\u0631<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%b1%d9%88%d8%b4_1_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d8%a7%d8%b2_%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1\" >\u0631\u0648\u0634 1: \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 == \u0627\u067e\u0631\u0627\u062a\u0648\u0631<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%b1%d9%88%d8%b4_2_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d8%a7%d8%b2_not_%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1\" >\u0631\u0648\u0634 2: \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 not \u0627\u067e\u0631\u0627\u062a\u0648\u0631<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_%d8%a7%db%8c%d9%86%da%a9%d9%87_%d8%a2%db%8c%d8%a7_%db%8c%da%a9_%d8%b1%d8%b4%d8%aa%d9%87_%d9%88%d8%ac%d9%88%d8%af_%d8%af%d8%a7%d8%b1%d8%af_%db%8c%d8%a7_%d8%ae%db%8c%d8%b1_none\" >\u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06cc\u0627 \u062e\u06cc\u0631 None<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_%d8%a7%db%8c%d9%86%da%a9%d9%87_%d8%a2%db%8c%d8%a7_%db%8c%da%a9_%d8%b1%d8%b4%d8%aa%d9%87_%d8%ae%d8%a7%d9%84%db%8c_%d8%a7%d8%b3%d8%aa_%db%8c%d8%a7_%d9%86%d9%87_none\" >\u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0646\u0647 None<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d9%86%da%a9%d8%a7%d8%aa_%d9%88_%d8%aa%d9%88%d8%b5%db%8c%d9%87_%d9%87%d8%a7\" >\u0646\u06a9\u0627\u062a \u0648 \u062a\u0648\u0635\u06cc\u0647 \u0647\u0627<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d9%86%da%a9%d9%86%db%8c%d8%af_%d8%a8%d8%ac%d8%a7%db%8c_is_%d8%a8%d8%b1%d8%a7%db%8c_%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_none\" >\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0646\u06a9\u0646\u06cc\u062f == \u0628\u062c\u0627\u06cc is \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc None<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%a7%d8%b2_%e2%80%9c%d8%ad%d9%82%db%8c%d9%82%d8%aa%e2%80%9d_%d9%be%d8%a7%db%8c%d8%aa%d9%88%d9%86_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%da%a9%d9%86%db%8c%d8%af\" >\u0627\u0632 &#8220;\u062d\u0642\u06cc\u0642\u062a&#8221; \u067e\u0627\u06cc\u062a\u0648\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d8%b1%d8%b3%db%8c%d8%af%da%af%db%8c_none_%d9%87%d9%86%da%af%d8%a7%d9%85_%d8%a7%d9%86%d8%ac%d8%a7%d9%85_%d8%b9%d9%85%d9%84%db%8c%d8%a7%d8%aa_%d8%b1%d9%88%db%8c_%d8%b1%d8%b4%d8%aa%d9%87_%d9%87%d8%a7%db%8c\" >\u0631\u0633\u06cc\u062f\u06af\u06cc None \u0647\u0646\u06af\u0627\u0645 \u0627\u0646\u062c\u0627\u0645 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0648\u06cc \u0631\u0634\u062a\u0647 \u0647\u0627\u06cc<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/rasanegaar.com\/blog\/%da%86%da%af%d9%88%d9%86%d9%87-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d9%85-%da%a9%d9%87-%d8%a2%db%8c%d8%a7-%db%8c%da%a9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%af%d8%b1-%d9%be%d8%a7%db%8c%d8%aa%d9%88\/#%d9%86%d8%aa%db%8c%d8%ac%d9%87\" >\u0646\u062a\u06cc\u062c\u0647<\/a><\/li><\/ul><\/nav><\/div>\n<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">\u0632\u0645\u0627\u0646 \u0644\u0627\u0632\u0645 \u0628\u0631\u0627\u06cc \u0645\u0637\u0627\u0644\u0639\u0647: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">\u062f\u0642\u06cc\u0642\u0647<\/span><\/span><p> <br \/>\n<\/p>\n<div><noscript><\/noscript><\/p>\n<h2 id=\"introduction\"><span class=\"ez-toc-section\" id=\"%d9%85%d8%b9%d8%b1%d9%81%db%8c\"><\/span>\u0645\u0639\u0631\u0641\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0627\u063a\u0644\u0628 \u0645\u0647\u0645 \u0627\u0633\u062a \u06a9\u0647 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0646\u0647 <code>None<\/code> \u0642\u0628\u0644 \u0627\u0632 \u0627\u0646\u062c\u0627\u0645 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0648\u06cc \u0622\u06cc \u062a\u06cc.  \u0627\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u0632 \u062e\u0637\u0627\u0647\u0627\u06cc \u063a\u06cc\u0631\u0645\u0646\u062a\u0638\u0631\u0647 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u062f \u0648 \u06a9\u062f \u0634\u0645\u0627 \u0631\u0627 \u0642\u0648\u06cc \u062a\u0631 \u06a9\u0646\u062f.  \u0627\u0645\u0627 \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631\u06cc\u0646 \u0648 \u067e\u0627\u06cc\u062a\u0648\u0646\u06cc\u06a9 \u062a\u0631\u06cc\u0646 \u0631\u0627\u0647 \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0686\u06cc\u0633\u062a\u061f  \u0648 \u0628\u0627\u06cc\u062f \u0645\u0631\u0627\u0642\u0628 \u0686\u0647 \u0645\u0634\u06a9\u0644\u0627\u062a \u0627\u062d\u062a\u0645\u0627\u0644\u06cc \u0628\u0627\u0634\u06cc\u062f\u061f<\/p>\n<blockquote>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647\u060c \u0645\u0627 \u0627\u06cc\u0646 \u0633\u0648\u0627\u0644\u0627\u062a \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645 \u0648 \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u06cc\u0645 \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0628\u0647 \u062f\u0631\u0633\u062a\u06cc \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0646\u0647 <code>None<\/code> \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0648 \u0647\u0645\u0686\u0646\u06cc\u0646 \u0628\u062d\u062b \u062f\u0631 \u0645\u0648\u0631\u062f \u0628\u0631\u062e\u06cc \u0627\u0632 \u0628\u0647\u062a\u0631\u06cc\u0646 \u0631\u0648\u0634 \u0647\u0627 \u0628\u0631\u0627\u06cc \u0642\u0627\u0628\u0644 \u0627\u0639\u062a\u0645\u0627\u062f\u062a\u0631 \u06a9\u0631\u062f\u0646 \u0648 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u06a9\u062f \u0634\u0645\u0627.<\/p>\n<\/blockquote>\n<h2 id=\"booleanevaluationinpython\"><span class=\"ez-toc-section\" id=\"%d8%a7%d8%b1%d8%b2%db%8c%d8%a7%d8%a8%db%8c_%d8%a8%d9%88%d9%84%db%8c_%d8%af%d8%b1_%d9%be%d8%a7%db%8c%d8%aa%d9%88%d9%86\"><\/span>\u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0628\u0648\u0644\u06cc \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u00ab\u0648\u0627\u0642\u0639\u06cc\u062a\u00bb \u06cc\u0627 \u00ab\u0646\u0627\u062f\u0631\u0633\u062a\u00bb \u062f\u0631 \u0646\u0638\u0631 \u06af\u0631\u0641\u062a\u0647 \u0645\u06cc\u200c\u0634\u0648\u0646\u062f \u0631\u0648\u06cc \u0622\u06cc\u0627 \u0622\u0646\u0647\u0627 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0645\u06cc \u06a9\u0646\u0646\u062f <code>True<\/code> \u06cc\u0627 <code>False<\/code> \u062f\u0631 \u0632\u0645\u06cc\u0646\u0647 \u0628\u0648\u0644\u06cc  \u0627\u06cc\u0646 \u0645\u0641\u0647\u0648\u0645 \u0647\u0646\u06af\u0627\u0645 \u0628\u0631\u0631\u0633\u06cc \u0634\u0631\u0627\u06cc\u0637 \u062f\u0631 \u06a9\u062f \u0646\u0642\u0634 \u0645\u0647\u0645\u06cc \u0627\u06cc\u0641\u0627 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0628\u0631\u0627\u06cc \u0631\u0634\u062a\u0647 \u0647\u0627\u060c \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc (<code>\"\"<\/code>) &#8220;\u0646\u0627\u062f\u0631\u0633\u062a&#8221; \u062f\u0631 \u0646\u0638\u0631 \u06af\u0631\u0641\u062a\u0647 \u0645\u06cc \u0634\u0648\u062f &#8211; \u0622\u0646 \u0631\u0627 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0645\u06cc \u06a9\u0646\u062f <code>False<\/code> \u062f\u0631 \u0632\u0645\u06cc\u0646\u0647 \u0628\u0648\u0644\u06cc  \u0627\u0632 \u0633\u0648\u06cc \u062f\u06cc\u06af\u0631\u060c \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u063a\u06cc\u0631 \u062e\u0627\u0644\u06cc &#8220;\u062d\u0642\u06cc\u0642\u062a&#8221; \u0627\u0633\u062a &#8211; \u0622\u0646 \u0631\u0627 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0645\u06cc \u06a9\u0646\u062f <code>True<\/code>.  \u0627\u0631\u0632\u0634 \u0648\u06cc\u0698\u0647 <code>None<\/code> \u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u062f\u0631 \u0642\u0637\u0639\u0647 \u06a9\u062f \u0632\u06cc\u0631 \u0646\u0634\u0627\u0646 \u062f\u0627\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a\u060c &#8220;\u0646\u0627\u062f\u0631\u0633\u062a&#8221; \u0646\u06cc\u0632 \u062f\u0631 \u0646\u0638\u0631 \u06af\u0631\u0641\u062a\u0647 \u0645\u06cc \u0634\u0648\u062f:<\/p>\n<pre><code class=\"hljs\">s1 = <span class=\"hljs-string\">\"\"<\/span>\ns2 = <span class=\"hljs-string\">\"Hello\"<\/span>\ns3 = <span class=\"hljs-literal\">None<\/span>\n\n<span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-built_in\">bool<\/span>(s1))  \n<span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-built_in\">bool<\/span>(s2))  \n<span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-built_in\">bool<\/span>(s3))  \n<\/code><\/pre>\n<p>\u0627\u06cc\u0646 \u062e\u0627\u0635\u06cc\u062a \u0631\u0634\u062a\u0647 \u0647\u0627 \u0648 <code>None<\/code> \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u062e\u06cc\u0631 \u0628\u0633\u06cc\u0627\u0631 \u0645\u0641\u06cc\u062f \u0627\u0633\u062a <code>None<\/code>.  \u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u062f\u0631 \u0628\u062e\u0634\u200c\u0647\u0627\u06cc \u0628\u0639\u062f\u06cc \u062e\u0648\u0627\u0647\u06cc\u0645 \u062f\u06cc\u062f\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u062f\u0633\u062a\u0648\u0631\u0647\u0627\u06cc \u0633\u0627\u062f\u0647 if \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u0628\u0631\u0631\u0633\u06cc\u200c\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0648 \u0627\u0632 &#8220;\u0646\u0627\u062f\u0631\u0633\u062a\u06cc&#8221; \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f \u0648 <code>None<\/code>.<\/p>\n<h2 id=\"checkingifastringisempty\"><span class=\"ez-toc-section\" id=\"%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_%d8%a7%db%8c%d9%86%da%a9%d9%87_%d8%a2%db%8c%d8%a7_%db%8c%da%a9_%d8%b1%d8%b4%d8%aa%d9%87_%d8%ae%d8%a7%d9%84%db%8c_%d8%a7%d8%b3%d8%aa_%db%8c%d8%a7_%d8%ae%db%8c%d8%b1\"><\/span>\u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u062e\u06cc\u0631<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0647\u0646\u06af\u0627\u0645 \u0628\u0631\u0631\u0633\u06cc \u062e\u0627\u0644\u06cc \u0628\u0648\u062f\u0646 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 \u0627\u06cc\u0646 \u0648\u0627\u0642\u0639\u06cc\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc &#8220;\u0646\u0627\u062f\u0631\u0633\u062a&#8221; \u0627\u0633\u062a.  \u0634\u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u0647\u0631 \u062f\u0648 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f <code>==<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u06cc\u0627 <code>not<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u0628\u0631\u0631\u0633\u06cc.<\/p>\n<h3 id=\"method1usingtheoperator\"><span class=\"ez-toc-section\" id=\"%d8%b1%d9%88%d8%b4_1_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d8%a7%d8%b2_%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1\"><\/span>\u0631\u0648\u0634 1: \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>==<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code class=\"hljs\">s = <span class=\"hljs-string\">\"\"<\/span>\n<span class=\"hljs-keyword\">if<\/span> s == <span class=\"hljs-string\">\"\"<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is empty\"<\/span>)\n<span class=\"hljs-keyword\">else<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is not empty\"<\/span>)\n<\/code><\/pre>\n<h3 id=\"method2usingthenotoperator\"><span class=\"ez-toc-section\" id=\"%d8%b1%d9%88%d8%b4_2_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d8%a7%d8%b2_not_%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1\"><\/span>\u0631\u0648\u0634 2: \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>not<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code class=\"hljs\">s = <span class=\"hljs-string\">\"\"<\/span>\n<span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-keyword\">not<\/span> s:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is empty\"<\/span>)\n<span class=\"hljs-keyword\">else<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is not empty\"<\/span>)\n<\/code><\/pre>\n<p>\u062f\u0631 \u0647\u0631 \u062f\u0648\u06cc \u0627\u06cc\u0646 \u0631\u0648\u0634 \u0647\u0627\u060c <code>if<\/code> \u0628\u06cc\u0627\u0646\u06cc\u0647 \u0627\u0631\u0627\u062f\u0647 print <code>\"String is empty\"<\/code>  \u0627\u06af\u0631 \u0631\u0634\u062a\u0647 <code>s<\/code> \u062e\u0627\u0644\u06cc \u0627\u0633\u062a.  \u0631\u0627 <code>not<\/code> \u0639\u0645\u0644\u06af\u0631 \u062f\u0631 \u0645\u062b\u0627\u0644 \u062f\u0648\u0645 &#8220;\u0635\u062d\u062a&#8221; \u06cc\u0627 &#8220;\u0646\u0627\u062f\u0631\u0633\u062a\u06cc&#8221; \u0631\u0634\u062a\u0647 \u0631\u0627 \u0646\u0641\u06cc \u0645\u06cc \u06a9\u0646\u062f \u0648 \u06a9\u062f \u0631\u0627 \u06a9\u0645\u06cc \u0645\u062e\u062a\u0635\u0631\u062a\u0631 \u0645\u06cc \u06a9\u0646\u062f.  \u0627\u06cc\u0646 \u06cc\u06a9 \u0631\u0648\u0634 \u0631\u0627\u06cc\u062c \u067e\u0627\u06cc\u062a\u0648\u0646\u06cc\u06a9 \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0631\u0634\u062a\u0647 \u0647\u0627\u06cc \u062e\u0627\u0644\u06cc \u0627\u0633\u062a.<\/p>\n<h2 id=\"checkingifastringisnone\"><span class=\"ez-toc-section\" id=\"%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_%d8%a7%db%8c%d9%86%da%a9%d9%87_%d8%a2%db%8c%d8%a7_%db%8c%da%a9_%d8%b1%d8%b4%d8%aa%d9%87_%d9%88%d8%ac%d9%88%d8%af_%d8%af%d8%a7%d8%b1%d8%af_%db%8c%d8%a7_%d8%ae%db%8c%d8%b1_none\"><\/span>\u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06cc\u0627 \u062e\u06cc\u0631 <code>None<\/code><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06cc\u0627 \u062e\u06cc\u0631 <code>None<\/code>\u0628\u0647\u062a\u0631\u06cc\u0646 \u0631\u0648\u0634 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>is<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0628\u0647 \u062c\u0627\u06cc <code>==<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631.  \u0627\u06cc\u0646 \u0628\u062e\u0627\u0637\u0631 \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 <code>is<\/code> \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u0622\u06cc\u0627 \u0647\u0631 \u062f\u0648 \u0639\u0645\u0644\u0648\u0646\u062f \u06cc\u06a9 \u0634\u06cc \u0647\u0633\u062a\u0646\u062f\u060c \u0646\u0647 \u0641\u0642\u0637 \u0645\u0639\u0627\u062f\u0644.<\/p>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u0646\u06af\u0627\u0647\u06cc \u0628\u0647 \u06a9\u0627\u0631\u0628\u0631\u062f \u0639\u0645\u0644\u06cc \u0622\u0646 \u0628\u06cc\u0627\u0646\u062f\u0627\u0632\u06cc\u0645 <code>is<\/code> \u0639\u0645\u0644\u06af\u0631 \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06cc\u0627 \u062e\u06cc\u0631 <code>None<\/code>&#8220;:<\/p>\n<pre><code class=\"hljs\">s = <span class=\"hljs-literal\">None<\/span>\n\n<span class=\"hljs-keyword\">if<\/span> s <span class=\"hljs-keyword\">is<\/span> <span class=\"hljs-literal\">None<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is None\"<\/span>)\n<span class=\"hljs-keyword\">else<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is not None\"<\/span>)\n<\/code><\/pre>\n<p>\u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u0627\u0646\u062a\u0638\u0627\u0631 \u0645\u06cc \u0631\u0641\u062a\u060c <code>if<\/code> \u0628\u06cc\u0627\u0646\u06cc\u0647 \u0627\u0631\u0627\u062f\u0647 print <code>\"String is None\"<\/code>  \u0627\u06af\u0631 \u0645\u062a\u063a\u06cc\u0631 <code>s<\/code> \u0627\u0633\u062a <code>None<\/code>.<\/p>\n<div class=\"alert alert-note\">\n<div class=\"flex\">\n<div class=\"flex-shrink-0 mr-3\"><\/div>\n<div class=\"w-full\">\n<p>\u06cc\u0627\u062f \u0622\u0648\u0631\u062f\u0646\u060c <code>None<\/code> \u06cc\u06a9 \u062a\u06a9\u200c\u062a\u0648\u0646 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646 \u0627\u0633\u062a\u060c \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u06a9\u0647 \u062a\u0646\u0647\u0627 \u06cc\u06a9 \u0646\u0645\u0648\u0646\u0647 \u0627\u0632 \u0622\u0646 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f <code>None<\/code>.  \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646\u060c \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>is<\/code> \u0645\u0646\u0627\u0633\u0628 \u062a\u0631 \u0627\u0633\u062a \u0648 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0647\u0646\u06af\u0627\u0645 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631 \u0628\u0627\u0634\u062f <code>None<\/code>.<\/p>\n<\/p><\/div><\/div><\/div>\n<h2 id=\"checkingifastringisemptyornone\"><span class=\"ez-toc-section\" id=\"%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_%d8%a7%db%8c%d9%86%da%a9%d9%87_%d8%a2%db%8c%d8%a7_%db%8c%da%a9_%d8%b1%d8%b4%d8%aa%d9%87_%d8%ae%d8%a7%d9%84%db%8c_%d8%a7%d8%b3%d8%aa_%db%8c%d8%a7_%d9%86%d9%87_none\"><\/span>\u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0646\u0647 <code>None<\/code><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u06cc\u0627 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0646\u0647 <code>None<\/code> \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0645\u0627 <em>\u062a\u06a9\u0646\u06cc\u06a9 \u0647\u0627\u06cc \u0645\u0648\u0631\u062f \u0628\u062d\u062b \u0631\u0627 \u0628\u0627 \u0647\u0645 \u062a\u0631\u06a9\u06cc\u0628 \u06a9\u0646\u06cc\u062f<\/em> \u062f\u0631 \u0628\u062e\u0634 \u0647\u0627\u06cc \u0642\u0628\u0644\u06cc  \u0645\u0627 \u0627\u0632 \u06cc\u06a9 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f <code>or<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0647\u0631 \u062f\u0648 \u0634\u0631\u0627\u06cc\u0637 \u0628\u0647 \u0637\u0648\u0631 \u0647\u0645\u0632\u0645\u0627\u0646:<\/p>\n<pre><code class=\"hljs\">s = <span class=\"hljs-string\">\"\"<\/span>  \n\n<span class=\"hljs-keyword\">if<\/span> s <span class=\"hljs-keyword\">is<\/span> <span class=\"hljs-literal\">None<\/span> <span class=\"hljs-keyword\">or<\/span> s == <span class=\"hljs-string\">\"\"<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is empty or None\"<\/span>)\n<span class=\"hljs-keyword\">else<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is not empty and not None\"<\/span>)\n<\/code><\/pre>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644\u060c <code>if<\/code> \u0628\u06cc\u0627\u0646\u06cc\u0647 \u062f\u0648 \u0634\u0631\u0637 \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u062f: if <code>s<\/code> \u0627\u0633\u062a <code>None<\/code> \u0648 \u0627\u06af\u0631 <code>s<\/code> \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a  \u0627\u06af\u0631 \u0647\u0631 \u06cc\u06a9 \u0627\u0632 \u0634\u0631\u0637 \u0647\u0627 \u062f\u0631\u0633\u062a \u0628\u0627\u0634\u062f\u060c \u062f\u0631\u0633\u062a \u0645\u06cc \u0634\u0648\u062f print <code>\"String is empty or None\"<\/code>.  \u0627\u06af\u0631 \u0647\u0631 \u062f\u0648 \u0634\u0631\u0637 \u0646\u0627\u062f\u0631\u0633\u062a \u0647\u0633\u062a\u0646\u062f (\u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u06a9\u0647 \u0631\u0634\u062a\u0647 \u062f\u0631\u0633\u062a \u0646\u06cc\u0633\u062a <code>None<\/code> \u0648 \u062e\u0627\u0644\u06cc \u0646\u06cc\u0633\u062a)\u060c \u062e\u0648\u0627\u0647\u062f \u0634\u062f print <code>\"String is not empty and not None\"<\/code>.<\/p>\n<h2 id=\"tipsandadvice\"><span class=\"ez-toc-section\" id=\"%d9%86%da%a9%d8%a7%d8%aa_%d9%88_%d8%aa%d9%88%d8%b5%db%8c%d9%87_%d9%87%d8%a7\"><\/span>\u0646\u06a9\u0627\u062a \u0648 \u062a\u0648\u0635\u06cc\u0647 \u0647\u0627<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 id=\"dontuseinsteadofistocheckfornone\"><span class=\"ez-toc-section\" id=\"%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d9%86%da%a9%d9%86%db%8c%d8%af_%d8%a8%d8%ac%d8%a7%db%8c_is_%d8%a8%d8%b1%d8%a7%db%8c_%d8%a8%d8%b1%d8%b1%d8%b3%db%8c_none\"><\/span>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0646\u06a9\u0646\u06cc\u062f <code>==<\/code> \u0628\u062c\u0627\u06cc <code>is<\/code> \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc <code>None<\/code><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u067e\u0627\u06cc\u062a\u0648\u0646 \u062f\u0648 \u0639\u0645\u0644\u06af\u0631 \u0628\u0631\u0627\u0628\u0631\u06cc \u062f\u0627\u0631\u062f\u060c <code>==<\/code> \u0648 <code>is<\/code>.  \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u0622\u0646\u0647\u0627 \u06af\u0627\u0647\u06cc \u0627\u0648\u0642\u0627\u062a \u06cc\u06a9\u0633\u0627\u0646 \u0639\u0645\u0644 \u0645\u06cc \u06a9\u0646\u0646\u062f\u060c \u0622\u0646\u0647\u0627 \u06cc\u06a9\u0633\u0627\u0646 \u0646\u06cc\u0633\u062a\u0646\u062f.  \u0631\u0627 <code>==<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u062f <em>\u0628\u0631\u0627\u0628\u0631\u06cc \u0627\u0631\u0632\u0634<\/em>\u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 <code>is<\/code> \u0647\u0648\u06cc\u062a \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u062f\u060c \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u06a9\u0647 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u0622\u06cc\u0627 <em>\u0639\u0645\u0644\u0648\u0646\u062f\u0647\u0627 \u06cc\u06a9 \u0634\u06cc \u0647\u0633\u062a\u0646\u062f<\/em>.<\/p>\n<p><code>None<\/code>  \u06cc\u06a9 \u062a\u06a9 \u062a\u0648\u0646 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646 \u0627\u0633\u062a &#8211; \u062a\u0646\u0647\u0627 \u06cc\u06a9 \u0646\u0645\u0648\u0646\u0647 \u0627\u0632 \u0622\u0646 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f <code>None<\/code>.  \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646\u060c \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646 \u0645\u0646\u0627\u0633\u0628 \u062a\u0631 \u0648 \u06a9\u0645\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631 \u0627\u0633\u062a <code>is<\/code> \u0647\u0646\u06af\u0627\u0645 \u0628\u0631\u0631\u0633\u06cc <code>None<\/code>.<\/p>\n<pre><code class=\"hljs\">s = <span class=\"hljs-literal\">None<\/span>\n\n\n<span class=\"hljs-keyword\">if<\/span> s <span class=\"hljs-keyword\">is<\/span> <span class=\"hljs-literal\">None<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"s is None\"<\/span>)\n\n\n<span class=\"hljs-keyword\">if<\/span> s == <span class=\"hljs-literal\">None<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"s is None\"<\/span>)\n<\/code><\/pre>\n<h3 id=\"takeadvantageofpythonstruthiness\"><span class=\"ez-toc-section\" id=\"%d8%a7%d8%b2_%e2%80%9c%d8%ad%d9%82%db%8c%d9%82%d8%aa%e2%80%9d_%d9%be%d8%a7%db%8c%d8%aa%d9%88%d9%86_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%da%a9%d9%86%db%8c%d8%af\"><\/span>\u0627\u0632 &#8220;\u062d\u0642\u06cc\u0642\u062a&#8221; \u067e\u0627\u06cc\u062a\u0648\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0628\u0631\u062e\u0648\u0631\u062f \u067e\u0627\u06cc\u062a\u0648\u0646 \u0628\u0627 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062e\u062a\u0644\u0641 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 &#8220;\u062f\u0631\u0633\u062a&#8221; \u06cc\u0627 &#8220;\u0646\u0627\u062f\u0631\u0633\u062a&#8221; \u062f\u0631 \u0632\u0645\u06cc\u0646\u0647 \u0647\u0627\u06cc \u0628\u0648\u0644\u06cc \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u06a9\u062f \u0634\u0645\u0627 \u0631\u0627 \u0633\u0627\u062f\u0647 \u06a9\u0646\u062f.  \u0628\u0647 \u062c\u0627\u06cc \u0645\u0642\u0627\u06cc\u0633\u0647 \u0635\u0631\u06cc\u062d \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0628\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc (<code>\"\"<\/code>) \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f <code>not<\/code> \u06a9\u0644\u0645\u0647 \u06a9\u0644\u06cc\u062f\u06cc \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u062e\u0627\u0644\u06cc \u0628\u0648\u062f\u0646 \u06cc\u06a9 \u0631\u0634\u062a\u0647:<\/p>\n<pre><code class=\"hljs\">s = <span class=\"hljs-string\">\"\"<\/span>\n\n\n<span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-keyword\">not<\/span> s:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is empty\"<\/span>)\n\n\n<span class=\"hljs-keyword\">if<\/span> s == <span class=\"hljs-string\">\"\"<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is empty\"<\/span>)\n<\/code><\/pre>\n<h3 id=\"handlenonewhenperformingoperationsonstrings\"><span class=\"ez-toc-section\" id=\"%d8%b1%d8%b3%db%8c%d8%af%da%af%db%8c_none_%d9%87%d9%86%da%af%d8%a7%d9%85_%d8%a7%d9%86%d8%ac%d8%a7%d9%85_%d8%b9%d9%85%d9%84%db%8c%d8%a7%d8%aa_%d8%b1%d9%88%db%8c_%d8%b1%d8%b4%d8%aa%d9%87_%d9%87%d8%a7%db%8c\"><\/span>\u0631\u0633\u06cc\u062f\u06af\u06cc <code>None<\/code> \u0647\u0646\u06af\u0627\u0645 \u0627\u0646\u062c\u0627\u0645 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0648\u06cc \u0631\u0634\u062a\u0647 \u0647\u0627\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0627\u06af\u0631 \u0634\u0627\u0646\u0633\u06cc \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06a9\u0647 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0627\u0634\u062f <code>None<\/code>\u060c \u0647\u0645\u06cc\u0634\u0647 \u0642\u0628\u0644 \u0627\u0632 \u0627\u0646\u062c\u0627\u0645 \u0639\u0645\u0644\u06cc\u0627\u062a \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f \u0631\u0648\u06cc \u0622\u06cc \u062a\u06cc.  \u063a\u0641\u0644\u062a \u0627\u0632 \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0645\u0646\u062c\u0631 \u0628\u0647 \u0627\u0644\u0641 \u0634\u0648\u062f <code>TypeError<\/code>:<\/p>\n<pre><code class=\"hljs\">s = <span class=\"hljs-literal\">None<\/span>\n\n\n<span class=\"hljs-built_in\">print<\/span>(s + <span class=\"hljs-string\">\" more text\"<\/span>)\n<\/code><\/pre>\n<p>\u0628\u0631\u0627\u06cc \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0627\u0632 \u0686\u0646\u06cc\u0646 \u062e\u0637\u0627\u0647\u0627\u06cc\u06cc\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0622\u06cc\u0627 \u0631\u0634\u062a\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06cc\u0627 \u062e\u06cc\u0631 <code>None<\/code> \u0642\u0628\u0644 \u0627\u0632 \u0627\u0646\u062c\u0627\u0645 \u0639\u0645\u0644\u06cc\u0627\u062a:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">if<\/span> s <span class=\"hljs-keyword\">is<\/span> <span class=\"hljs-keyword\">not<\/span> <span class=\"hljs-literal\">None<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(s + <span class=\"hljs-string\">\" more text\"<\/span>)\n<span class=\"hljs-keyword\">else<\/span>:\n    <span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"String is None, cannot perform operation\"<\/span>)\n<\/code><\/pre>\n<h2 id=\"conclusion\"><span class=\"ez-toc-section\" id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\"><\/span>\u0646\u062a\u06cc\u062c\u0647<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0645\u0627 \u062f\u06cc\u062f\u0647\u200c\u0627\u06cc\u0645 \u06a9\u0647 \u067e\u0627\u06cc\u062a\u0648\u0646 \u0631\u0627\u0647\u200c\u0647\u0627\u06cc \u0633\u0627\u062f\u0647 \u0648 \u06a9\u0627\u0631\u0622\u0645\u062f\u06cc \u0631\u0627 \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u0628\u0631\u0631\u0633\u06cc\u200c\u0647\u0627 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc\u200c\u06a9\u0646\u062f \u0648 \u0627\u0632 &#8220;\u0635\u062d\u062a&#8221; \u0648 &#8220;\u0646\u0627\u062f\u0631\u0633\u062a\u06cc&#8221; \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062e\u062a\u0644\u0641 \u062f\u0631 \u0632\u0645\u06cc\u0646\u0647\u200c\u0647\u0627\u06cc \u0628\u0648\u0644\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u200c\u06a9\u0646\u062f.  \u0645\u0627 \u0647\u0645\u0686\u0646\u06cc\u0646 \u062f\u0631 \u0645\u0648\u0631\u062f \u0628\u0631\u062e\u06cc \u0627\u0632 \u062f\u0627\u0645 \u0647\u0627\u06cc \u0628\u0627\u0644\u0642\u0648\u0647 \u0628\u0631\u0627\u06cc \u0627\u062c\u062a\u0646\u0627\u0628 \u0648 \u0628\u0647\u062a\u0631\u06cc\u0646 \u0631\u0648\u0634 \u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0628\u0627\u06cc\u062f \u062f\u0631 \u0647\u0646\u06af\u0627\u0645 \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u0628\u0631\u0631\u0633\u06cc \u0647\u0627 \u062f\u0646\u0628\u0627\u0644 \u0634\u0648\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>is<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc <code>None<\/code> \u0648 <code>not<\/code> \u0639\u0645\u0644\u06af\u0631 \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc.<\/p>\n<\/div>\n<p><script>\n                        !function(f,b,e,v,n,t,s)\n                        {if(f.fbq)return;n=f.fbq=function(){n.callMethod?\n                        n.callMethod.apply(n,arguments):n.queue.push(arguments)};\n                        if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';\n                        n.queue=();t=b.createElement(e);t.async=!0;\n                        t.src=v;s=b.getElementsByTagName(e)(0);\n                        s.parentNode.insertBefore(t,s)}(window, document,'script',\n                        'https:\/\/connect.facebook.net\/en_US\/fbevents.js');\n                        fbq('init', '525232124909042');\n                        fbq('track', 'PageView');\n                    <\/script>    (\u0628\u0631\u0686\u0633\u0628\u200c\u0647\u0627 \u0628\u0647 \u062a\u0631\u062c\u0645\u0647)# python<br \/>\n<br \/><br \/>\n<br \/>\u0645\u0646\u062a\u0634\u0631 \u0634\u062f\u0647 \u062f\u0631 1402-12-31 07:34:06<br \/>\n<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-center kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;center&quot;,&quot;id&quot;:&quot;12531&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\u0627\u0645\u062a\u06cc\u0627\u0632 \u0634\u0645\u0627 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0637\u0644\u0628&quot;,&quot;legend&quot;:&quot;0\\\/5 (0 \u0631\u0627\u06cc)&quot;,&quot;size&quot;:&quot;30&quot;,&quot;title&quot;:&quot;\u0686\u06af\u0648\u0646\u0647 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} ({count} \u0631\u0627\u06cc)&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 24px;\">\n            <span class=\"kksr-muted\">\u0627\u0645\u062a\u06cc\u0627\u0632 \u0634\u0645\u0627 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0637\u0644\u0628<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">\u0632\u0645\u0627\u0646 \u0644\u0627\u0632\u0645 \u0628\u0631\u0627\u06cc \u0645\u0637\u0627\u0644\u0639\u0647: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">\u062f\u0642\u06cc\u0642\u0647<\/span><\/span>\u0645\u0639\u0631\u0641\u06cc \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646\u060c \u0627\u063a\u0644\u0628 \u0645\u0647\u0645 \u0627\u0633\u062a \u06a9\u0647 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0646\u0647 None \u0642\u0628\u0644 \u0627\u0632 \u0627\u0646\u062c\u0627\u0645 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0648\u06cc \u0622\u06cc \u062a\u06cc. \u0627\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u0632 \u062e\u0637\u0627\u0647\u0627\u06cc \u063a\u06cc\u0631\u0645\u0646\u062a\u0638\u0631\u0647 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u062f \u0648 \u06a9\u062f \u0634\u0645\u0627 \u0631\u0627 \u0642\u0648\u06cc \u062a\u0631 \u06a9\u0646\u062f. \u0627\u0645\u0627 \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631\u06cc\u0646 \u0648 \u067e\u0627\u06cc\u062a\u0648\u0646\u06cc\u06a9 \u062a\u0631\u06cc\u0646 \u0631\u0627\u0647 \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0686\u06cc\u0633\u062a\u061f \u0648 \u0628\u0627\u06cc\u062f \u0645\u0631\u0627\u0642\u0628 \u0686\u0647 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":9398,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1743,620],"tags":[1749,1748,1747,1746,1751,2147,1811,1970,1753,1744,1822,3032,2750,2285,1788,1795,2176,2169,1831,1813],"class_list":["post-12531","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","category-programming","tag-python","tag-python-hosting","tag-python-vps","tag-vps-","tag-1751","tag-2147","tag-1811","tag-1970","tag-1753","tag-1744","tag-1822","tag-3032","tag-2750","tag-2285","tag-1788","tag-1795","tag-2176","tag-2169","tag-1831","tag-1813"],"acf":[],"_links":{"self":[{"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/posts\/12531","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/comments?post=12531"}],"version-history":[{"count":0,"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/posts\/12531\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/media\/9398"}],"wp:attachment":[{"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/media?parent=12531"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/categories?post=12531"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rasanegaar.com\/blog\/wp-json\/wp\/v2\/tags?post=12531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}