{"id":4542,"date":"2020-10-14T12:03:55","date_gmt":"2020-10-14T06:33:55","guid":{"rendered":"http:\/\/www.pythonpool.com\/?p=4542"},"modified":"2026-07-13T12:28:15","modified_gmt":"2026-07-13T06:58:15","slug":"python-check-if-string-is-integer","status":"publish","type":"post","link":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/","title":{"rendered":"Check if a String Is an Integer in Python: int() vs isdigit()"},"content":{"rendered":"<p>To check whether text represents an integer in Python, try the same conversion the program will eventually need: call <code>int()<\/code> and catch <code>ValueError<\/code>. This accepts ordinary signed integer syntax and surrounding whitespace. Methods such as <code>isdecimal()<\/code>, <code>isdigit()<\/code>, and <code>isnumeric()<\/code> answer narrower character questions; they are not interchangeable with conversion.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #990303;color:#990303\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #990303;color:#990303\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Quick_answer\" >Quick answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Use_int_for_real_integer_syntax\" >Use int() for real integer syntax<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Convert_once_after_validation\" >Convert once after validation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Know_what_isdecimal_isdigit_and_isnumeric_mean\" >Know what isdecimal(), isdigit(), and isnumeric() mean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Accept_signed_ASCII_integers_with_a_policy\" >Accept signed ASCII integers with a policy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Handle_bases_and_leading_zeros_deliberately\" >Handle bases and leading zeros deliberately<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Do_not_confuse_text_with_an_integer_object\" >Do not confuse text with an integer object<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Validate_user_input_without_changing_it_silently\" >Validate user input without changing it silently<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Check_booleans_and_numeric-looking_values\" >Check booleans and numeric-looking values<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Test_the_full_accepted_grammar\" >Test the full accepted grammar<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Return_a_typed_result\" >Return a typed result<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Quick_answer\"><\/span>Quick answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use <code>int(value)<\/code> inside a <code>try<\/code>\/<code>except ValueError<\/code> block when the input must become an integer. Use a string method when the policy is specifically about which characters are allowed. The Python <a href=\"https:\/\/docs.python.org\/3\/library\/stdtypes.html#str.isdecimal\">string-method documentation<\/a> defines the differences among the digit predicates.<\/p>\n<figure class=\"pythonpool-article-visual\"><img src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-string-integer-validation.png\" alt=\"Python integer string validation diagram comparing int conversion, ValueError, digit methods, Unicode, and signed input\" width=\"1536\" height=\"1024\" loading=\"lazy\" decoding=\"async\"><figcaption>Use int() for real integer syntax; use isdecimal(), isdigit(), or isnumeric() only for explicit character policies.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Use_int_for_real_integer_syntax\"><\/span>Use int() for real integer syntax<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The conversion approach matches the operation that follows. It accepts values such as <code>\"42\"<\/code>, <code>\"-42\"<\/code>, <code>\"+42\"<\/code>, and strings with harmless leading or trailing whitespace. Invalid text raises <code>ValueError<\/code>.<\/p>\n<pre><code class=\"language-python\">def is_integer_text(value: str) -&gt; bool:\n    try:\n        int(value)\n    except ValueError:\n        return False\n    return True\n\nsamples = [\"42\", \"-42\", \"+42\", \" 42 \", \"4.2\", \"python\", \"\"]\nfor sample in samples:\n    print(sample, is_integer_text(sample))\n<\/code><\/pre>\n<p>This is usually the best policy for form fields, command-line values, CSV cleanup, and API payloads. It avoids accepting a character sequence that passes a digit test but cannot be stored or used by the next numeric operation.<\/p>\n<p><!-- Python Pool visual layout repair 2026-07-13 --><\/p>\n<figure class=\"pythonpool-article-visual pythonpool-supporting-visual\"><img src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/string-int-text-b185.png\" alt=\"Python Pool infographic showing a string, signs, digits, whitespace, and integer validation\" width=\"1536\" height=\"1054\" loading=\"lazy\" decoding=\"async\"><figcaption>String input: A string, signs, digits, whitespace, and integer validation.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Convert_once_after_validation\"><\/span>Convert once after validation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If the value is valid, keep the converted integer rather than validating and then parsing it again. A helper can return either a parsed value or a clear error, depending on the application boundary.<\/p>\n<pre><code class=\"language-python\">def parse_quantity(value: str) -&gt; int | None:\n    try:\n        return int(value)\n    except ValueError:\n        return None\n\nquantity = parse_quantity(\"12\")\nprint(quantity)\n<\/code><\/pre>\n<p>Decide whether an empty string should produce a default, an optional missing value, or a validation error. Do not silently turn invalid business input into zero unless zero has that explicit meaning.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Know_what_isdecimal_isdigit_and_isnumeric_mean\"><\/span>Know what isdecimal(), isdigit(), and isnumeric() mean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><code>isdecimal()<\/code> is the narrowest of the three common predicates and returns true for strings made entirely of decimal characters. <code>isdigit()<\/code> includes additional digit-like characters. <code>isnumeric()<\/code> is broader still and includes characters with numeric meaning that are not ordinary decimal digits. All three return false for an empty string, and none accepts a leading minus sign.<\/p>\n<pre><code class=\"language-python\">samples = [\"123\", \"-123\", \"\uff11\uff12\uff13\", \"\u00b2\", \"\u2155\", \"\"]\n\nfor sample in samples:\n    print(\n        repr(sample),\n        sample.isdecimal(),\n        sample.isdigit(),\n        sample.isnumeric(),\n    )\n<\/code><\/pre>\n<p>Use these methods when the product requirement is about character classes, such as a particular kind of identifier. Do not use them as a shortcut for \u201ccan this value be converted to the integer type?\u201d<\/p>\n<figure class=\"pythonpool-article-visual pythonpool-supporting-visual\"><img src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/string-int-parse-b185.png\" alt=\"Python Pool infographic mapping a string through int to a Python integer or ValueError\" width=\"1536\" height=\"1054\" loading=\"lazy\" decoding=\"async\"><figcaption>int conversion: A string through int to a Python integer or ValueError.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Accept_signed_ASCII_integers_with_a_policy\"><\/span>Accept signed ASCII integers with a policy<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If a storage or protocol contract accepts only ASCII decimal digits with an optional sign, state that policy explicitly. A regular expression can express the rule, or a conversion attempt can be followed by an ASCII check when the distinction matters.<\/p>\n<pre><code class=\"language-python\">import re\n\ninteger_pattern = re.compile(r\"^[+-]?[0-9]+$\")\nsamples = [\"42\", \"-42\", \" 42 \", \"\uff11\uff12\uff13\"]\n\nfor sample in samples:\n    print(sample, bool(integer_pattern.fullmatch(sample)))\n<\/code><\/pre>\n<p>Choose one contract and test it with signs, whitespace, empty input, leading zeros, Unicode digits, decimal points, and exponent notation. A regex that validates text does not replace the later numeric conversion.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Handle_bases_and_leading_zeros_deliberately\"><\/span>Handle bases and leading zeros deliberately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><code>int(value)<\/code> treats a normal decimal string as base ten, including leading zeros. When input may contain prefixes such as <code>0x<\/code>, pass a base explicitly or use <code>base=0<\/code> only when accepting Python-style prefixes is intentional.<\/p>\n<pre><code class=\"language-python\">decimal_value = int(\"0012\")\nhex_value = int(\"0x10\", base=0)\n\nprint(decimal_value)\nprint(hex_value)\n<\/code><\/pre>\n<p>Do not accept a base prefix accidentally in a user-facing field. Parsing rules are part of the input contract and should be documented with examples.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Do_not_confuse_text_with_an_integer_object\"><\/span>Do not confuse text with an integer object<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><code>isinstance(value, int)<\/code> checks whether a value is already an integer object. It does not validate a string. Conversely, a string that contains digits is still text until it is parsed. Keep the distinction clear at boundaries so later arithmetic and formatting do not require guesswork.<\/p>\n<p>For related conversion errors, see <a href=\"https:\/\/www.pythonpool.com\/solved-typeerror-can-only-concatenate-str-not-int-to-str\/\">str and int TypeError fixes<\/a> and <a href=\"https:\/\/www.pythonpool.com\/python-string-length\/\">Python string length<\/a>.<\/p>\n<figure class=\"pythonpool-article-visual pythonpool-supporting-visual\"><img src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/string-int-isdigit-b185.png\" alt=\"Python Pool infographic comparing isdigit, signed strings, Unicode digits, and validation\" width=\"1536\" height=\"1054\" loading=\"lazy\" decoding=\"async\"><figcaption>Digit test: Isdigit, signed strings, Unicode digits, and validation.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Validate_user_input_without_changing_it_silently\"><\/span>Validate user input without changing it silently<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Validation should report why an input is rejected and preserve the original text for correction or logging. Do not call <code>strip()<\/code> and overwrite the original value unless surrounding whitespace is explicitly allowed. When whitespace is allowed, parse the trimmed value and keep the policy visible.<\/p>\n<pre><code class=\"language-python\">raw = \"  -12  \"\ncandidate = raw.strip()\n\ntry:\n    number = int(candidate)\nexcept ValueError:\n    print(\"enter a whole number\")\nelse:\n    print(number)\n<\/code><\/pre>\n<p>For web forms and APIs, attach validation errors to the input field rather than converting them into a generic zero. This prevents invalid values from silently changing totals, page numbers, limits, or identifiers.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Check_booleans_and_numeric-looking_values\"><\/span>Check booleans and numeric-looking values<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In Python, <code>bool<\/code> is a subclass of <code>int<\/code>, so an already parsed value may need a policy that excludes booleans. A string such as <code>\"1\"<\/code> is text until conversion, while the Boolean object <code>True<\/code> is already a different type. Decide whether the application accepts either representation.<\/p>\n<pre><code class=\"language-python\">value = True\nis_integer_but_not_bool = isinstance(value, int) and not isinstance(value, bool)\nprint(is_integer_but_not_bool)\n<\/code><\/pre>\n<figure class=\"pythonpool-article-visual pythonpool-supporting-visual\"><img src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/string-int-check-b185.png\" alt=\"Python Pool infographic testing empty strings, whitespace, plus-minus signs, bases, and validation\" width=\"1536\" height=\"1054\" loading=\"lazy\" decoding=\"async\"><figcaption>Integer checks: Empty strings, whitespace, plus-minus signs, bases, and validation.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Test_the_full_accepted_grammar\"><\/span>Test the full accepted grammar<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Include leading zeros, plus and minus signs, surrounding spaces, decimal points, exponent notation, empty input, Unicode digits, and very large values in validation tests. The expected result should follow the storage and calculation contract, not only what a particular method happens to accept.<\/p>\n<p>When a base is involved, test prefixes such as <code>0x<\/code> separately and pass the intended base to <code>int()<\/code>. Do not use <code>base=0<\/code> in an ordinary decimal field unless accepting Python-style prefixes is part of the interface.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Return_a_typed_result\"><\/span>Return a typed result<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A parsing helper is easier to reuse when its return contract is clear: return an integer, return an optional integer, or raise a domain-specific validation error. Avoid returning a mixture of integer, string, and Boolean sentinel values because callers then need another layer of type guessing.<\/p>\n<p>Document the accepted grammar beside the helper so future callers do not infer it from a single example.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>How do I check if a string is an integer in Python?<\/h3>\n<p>Call int(value) inside try and catch ValueError when the text must become an integer.<\/p>\n<h3>What is the difference between isdigit() and int()?<\/h3>\n<p>isdigit() checks digit-like characters, while int() tests whether the complete text can be converted using the numeric contract.<\/p>\n<h3>Do isdecimal() and isdigit() accept negative numbers?<\/h3>\n<p>No. These methods return false for a leading minus sign; use int() or an explicit signed-input policy.<\/p>\n<h3>Does int() accept spaces and leading zeros?<\/h3>\n<p>int() accepts surrounding whitespace and normal decimal leading zeros, subject to the base and input policy you choose.<\/p>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I check if a string is an integer in Python?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Call int(value) inside try and catch ValueError when the text must become an integer.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between isdigit() and int()?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"isdigit() checks digit-like characters, while int() tests whether the complete text can be converted using the numeric contract.\"}},{\"@type\":\"Question\",\"name\":\"Do isdecimal() and isdigit() accept negative numbers?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. These methods return false for a leading minus sign; use int() or an explicit signed-input policy.\"}},{\"@type\":\"Question\",\"name\":\"Does int() accept spaces and leading zeros?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"int() accepts surrounding whitespace and normal decimal leading zeros, subject to the base and input policy you choose.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Validate integer text with int() and ValueError, or choose digit methods and regex when the input policy is narrower.<\/p>\n","protected":false},"author":1,"featured_media":32383,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[15],"tags":[2352,2354,2351,2357,2356,2353,2355],"class_list":["post-4542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-check-if-string-is-an-integer-python","tag-check-if-string-is-integer-python","tag-how-to-check-if-a-string-is-an-integer-python","tag-how-to-check-if-string-is-integer-python","tag-python-check-if-string-is-integer","tag-python-check-if-string-is-integer-or-float","tag-python-how-to-check-if-a-string-is-an-integer","infinite-scroll-item"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.1 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Check if a String Is an Integer in Python: int() vs isdigit()<\/title>\n<meta name=\"description\" content=\"Check Python integer text with int() and ValueError, then compare isdecimal(), isdigit(), isnumeric(), regex, signs, whitespace, and bases.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Check if a String Is an Integer in Python: int() vs isdigit()\" \/>\n<meta property=\"og:description\" content=\"Validate integer text with int() and ValueError, or choose digit methods and regex when the input policy is narrower.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/\" \/>\n<meta property=\"og:site_name\" content=\"Python Pool\" \/>\n<meta property=\"article:published_time\" content=\"2020-10-14T06:33:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-13T06:58:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-string-integer-validation.png\" \/>\n<meta name=\"author\" content=\"Python Pool\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Python Pool\" \/>\n<meta name=\"twitter:description\" content=\"Practical Python tutorials, error fixes, code examples, and project guides.\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-string-integer-validation.png\" \/>\n<meta name=\"twitter:creator\" content=\"@pythonpool\" \/>\n<meta name=\"twitter:site\" content=\"@pythonpool\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Python Pool\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/\"},\"author\":{\"name\":\"Python Pool\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#\\\/schema\\\/person\\\/f87448ee54c0ffd2889fbf2408c18998\"},\"headline\":\"Check if a String Is an Integer in Python: int() vs isdigit()\",\"datePublished\":\"2020-10-14T06:33:55+00:00\",\"dateModified\":\"2026-07-13T06:58:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/\"},\"wordCount\":975,\"commentCount\":7,\"publisher\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.pythonpool.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/python-check-if-string-is-integer-guide-pythonpool.png\",\"keywords\":[\"check if string is an integer python\",\"check if string is integer python\",\"how to check if a string is an integer python\",\"how to check if string is integer python\",\"python check if string is integer\",\"python check if string is integer or float\",\"python how to check if a string is an integer\"],\"articleSection\":[\"Tutorials\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/\",\"url\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/\",\"name\":\"Check if a String Is an Integer in Python: int() vs isdigit()\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.pythonpool.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/python-check-if-string-is-integer-guide-pythonpool.png\",\"datePublished\":\"2020-10-14T06:33:55+00:00\",\"dateModified\":\"2026-07-13T06:58:15+00:00\",\"description\":\"Check Python integer text with int() and ValueError, then compare isdecimal(), isdigit(), isnumeric(), regex, signs, whitespace, and bases.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.pythonpool.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/python-check-if-string-is-integer-guide-pythonpool.png\",\"contentUrl\":\"https:\\\/\\\/www.pythonpool.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/python-check-if-string-is-integer-guide-pythonpool.png\",\"width\":1350,\"height\":650,\"caption\":\"Python check if string is integer guide showing input string validated with int isdecimal and regex\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/python-check-if-string-is-integer\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.pythonpool.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Check if a String Is an Integer in Python: int() vs isdigit()\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#website\",\"url\":\"https:\\\/\\\/www.pythonpool.com\\\/\",\"name\":\"Python Pool\",\"description\":\"Practical Python tutorials, error fixes, code examples, and project guides.\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.pythonpool.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#organization\",\"name\":\"Python Pool\",\"url\":\"https:\\\/\\\/www.pythonpool.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.pythonpool.com\\\/wp-content\\\/uploads\\\/2020\\\/08\\\/aa.png\",\"contentUrl\":\"https:\\\/\\\/www.pythonpool.com\\\/wp-content\\\/uploads\\\/2020\\\/08\\\/aa.png\",\"width\":452,\"height\":185,\"caption\":\"Python Pool\"},\"image\":{\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/x.com\\\/pythonpool\",\"https:\\\/\\\/www.youtube.com\\\/c\\\/pythonpool\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.pythonpool.com\\\/#\\\/schema\\\/person\\\/f87448ee54c0ffd2889fbf2408c18998\",\"name\":\"Python Pool\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/fdd3cb9ad7f560324dfd481989550aa8ffce84388fd253c42beca35c999d3108?s=96&d=wavatar&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/fdd3cb9ad7f560324dfd481989550aa8ffce84388fd253c42beca35c999d3108?s=96&d=wavatar&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/fdd3cb9ad7f560324dfd481989550aa8ffce84388fd253c42beca35c999d3108?s=96&d=wavatar&r=g\",\"caption\":\"Python Pool\"}}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Check if a String Is an Integer in Python: int() vs isdigit()","description":"Check Python integer text with int() and ValueError, then compare isdecimal(), isdigit(), isnumeric(), regex, signs, whitespace, and bases.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/","og_locale":"en_US","og_type":"article","og_title":"Check if a String Is an Integer in Python: int() vs isdigit()","og_description":"Validate integer text with int() and ValueError, or choose digit methods and regex when the input policy is narrower.","og_url":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/","og_site_name":"Python Pool","article_published_time":"2020-10-14T06:33:55+00:00","article_modified_time":"2026-07-13T06:58:15+00:00","og_image":[{"url":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-string-integer-validation.png","type":"","width":"","height":""}],"author":"Python Pool","twitter_card":"summary_large_image","twitter_title":"Python Pool","twitter_description":"Practical Python tutorials, error fixes, code examples, and project guides.","twitter_image":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-string-integer-validation.png","twitter_creator":"@pythonpool","twitter_site":"@pythonpool","twitter_misc":{"Written by":"Python Pool","Est. reading time":"10 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#article","isPartOf":{"@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/"},"author":{"name":"Python Pool","@id":"https:\/\/www.pythonpool.com\/#\/schema\/person\/f87448ee54c0ffd2889fbf2408c18998"},"headline":"Check if a String Is an Integer in Python: int() vs isdigit()","datePublished":"2020-10-14T06:33:55+00:00","dateModified":"2026-07-13T06:58:15+00:00","mainEntityOfPage":{"@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/"},"wordCount":975,"commentCount":7,"publisher":{"@id":"https:\/\/www.pythonpool.com\/#organization"},"image":{"@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#primaryimage"},"thumbnailUrl":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-check-if-string-is-integer-guide-pythonpool.png","keywords":["check if string is an integer python","check if string is integer python","how to check if a string is an integer python","how to check if string is integer python","python check if string is integer","python check if string is integer or float","python how to check if a string is an integer"],"articleSection":["Tutorials"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/","url":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/","name":"Check if a String Is an Integer in Python: int() vs isdigit()","isPartOf":{"@id":"https:\/\/www.pythonpool.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#primaryimage"},"image":{"@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#primaryimage"},"thumbnailUrl":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-check-if-string-is-integer-guide-pythonpool.png","datePublished":"2020-10-14T06:33:55+00:00","dateModified":"2026-07-13T06:58:15+00:00","description":"Check Python integer text with int() and ValueError, then compare isdecimal(), isdigit(), isnumeric(), regex, signs, whitespace, and bases.","breadcrumb":{"@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#primaryimage","url":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-check-if-string-is-integer-guide-pythonpool.png","contentUrl":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2026\/07\/python-check-if-string-is-integer-guide-pythonpool.png","width":1350,"height":650,"caption":"Python check if string is integer guide showing input string validated with int isdecimal and regex"},{"@type":"BreadcrumbList","@id":"https:\/\/www.pythonpool.com\/python-check-if-string-is-integer\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.pythonpool.com\/"},{"@type":"ListItem","position":2,"name":"Check if a String Is an Integer in Python: int() vs isdigit()"}]},{"@type":"WebSite","@id":"https:\/\/www.pythonpool.com\/#website","url":"https:\/\/www.pythonpool.com\/","name":"Python Pool","description":"Practical Python tutorials, error fixes, code examples, and project guides.","publisher":{"@id":"https:\/\/www.pythonpool.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.pythonpool.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.pythonpool.com\/#organization","name":"Python Pool","url":"https:\/\/www.pythonpool.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.pythonpool.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2020\/08\/aa.png","contentUrl":"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2020\/08\/aa.png","width":452,"height":185,"caption":"Python Pool"},"image":{"@id":"https:\/\/www.pythonpool.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/x.com\/pythonpool","https:\/\/www.youtube.com\/c\/pythonpool"]},{"@type":"Person","@id":"https:\/\/www.pythonpool.com\/#\/schema\/person\/f87448ee54c0ffd2889fbf2408c18998","name":"Python Pool","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/fdd3cb9ad7f560324dfd481989550aa8ffce84388fd253c42beca35c999d3108?s=96&d=wavatar&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/fdd3cb9ad7f560324dfd481989550aa8ffce84388fd253c42beca35c999d3108?s=96&d=wavatar&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/fdd3cb9ad7f560324dfd481989550aa8ffce84388fd253c42beca35c999d3108?s=96&d=wavatar&r=g","caption":"Python Pool"}}]}},"_links":{"self":[{"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/posts\/4542","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/comments?post=4542"}],"version-history":[{"count":31,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/posts\/4542\/revisions"}],"predecessor-version":[{"id":41427,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/posts\/4542\/revisions\/41427"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/media\/32383"}],"wp:attachment":[{"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/media?parent=4542"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/categories?post=4542"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pythonpool.com\/wp-json\/wp\/v2\/tags?post=4542"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}