{"id":1050316,"date":"2024-12-31T14:06:45","date_gmt":"2024-12-31T06:06:45","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1050316.html"},"modified":"2024-12-31T14:06:47","modified_gmt":"2024-12-31T06:06:47","slug":"%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%adpython%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1050316.html","title":{"rendered":"\u5982\u4f55\u5224\u65adpython\u4e2d\u7684\u5b57\u7b26\u4e32"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2024\/12\/517fdd91-ccff-455e-b020-4a7eef80be33.webp?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"\u5982\u4f55\u5224\u65adpython\u4e2d\u7684\u5b57\u7b26\u4e32\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\u5224\u65ad\u5b57\u7b26\u4e32\u7684\u51e0\u79cd\u65b9\u6cd5\u6709\uff1a\u68c0\u67e5\u5b57\u7b26\u4e32\u7c7b\u578b\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u3001\u5229\u7528\u6761\u4ef6\u5224\u65ad\u3002<\/strong> \u5176\u4e2d\uff0c<strong>\u68c0\u67e5\u5b57\u7b26\u4e32\u7c7b\u578b<\/strong> \u662f\u6700\u5e38\u89c1\u548c\u57fa\u7840\u7684\u65b9\u6cd5\u3002\u53ef\u4ee5\u901a\u8fc7 <code>isinstance()<\/code> \u51fd\u6570\u6765\u68c0\u67e5\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u975e\u5e38\u76f4\u89c2\u4e14\u5e38\u7528\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u68c0\u67e5\u5b57\u7b26\u4e32\u7c7b\u578b<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528 <code>isinstance()<\/code> \u51fd\u6570\u53ef\u4ee5\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b\u3002\u8fd9\u4e2a\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u68c0\u67e5\u7684\u53d8\u91cf\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u7c7b\u578b\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">text = &quot;Hello, World!&quot;<\/p>\n<p>is_string = isinstance(text, str)<\/p>\n<p>print(is_string)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u786e\u4fdd\u53d8\u91cf\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u3002\u8fd9\u5728\u9700\u8981\u4e25\u683c\u7c7b\u578b\u68c0\u67e5\u7684\u573a\u666f\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>Python\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5224\u65ad\u5b57\u7b26\u4e32\u7684\u5404\u79cd\u5c5e\u6027\u548c\u7279\u5f81\u3002<\/p>\n<\/p>\n<p><h4>1\u3001<code>str.isalpha()<\/code><\/h4>\n<\/p>\n<p><p>\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u53ea\u5305\u542b\u5b57\u6bcd\u5b57\u7b26\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">text = &quot;Hello&quot;<\/p>\n<p>is_alpha = text.isalpha()<\/p>\n<p>print(is_alpha)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001<code>str.isdigit()<\/code><\/h4>\n<\/p>\n<p><p>\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u53ea\u5305\u542b\u6570\u5b57\u5b57\u7b26\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">number = &quot;12345&quot;<\/p>\n<p>is_digit = number.isdigit()<\/p>\n<p>print(is_digit)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3\u3001<code>str.isalnum()<\/code><\/h4>\n<\/p>\n<p><p>\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u53ea\u5305\u542b\u5b57\u6bcd\u548c\u6570\u5b57\u5b57\u7b26\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">text = &quot;Hello123&quot;<\/p>\n<p>is_alnum = text.isalnum()<\/p>\n<p>print(is_alnum)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d<\/h3>\n<\/p>\n<p><p>\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u5339\u914d\u590d\u6742\u7684\u5b57\u7b26\u4e32\u6a21\u5f0f\u3002Python\u7684 <code>re<\/code> \u6a21\u5757\u63d0\u4f9b\u4e86\u5bf9\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u652f\u6301\u3002<\/p>\n<\/p>\n<p><h4>1\u3001\u5339\u914d\u5b57\u6bcd\u5b57\u7b26<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import re<\/p>\n<p>text = &quot;Hello&quot;<\/p>\n<p>pattern = r&#39;^[A-Za-z]+$&#39;<\/p>\n<p>is_match = re.match(pattern, text) is not None<\/p>\n<p>print(is_match)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001\u5339\u914d\u6570\u5b57\u5b57\u7b26<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import re<\/p>\n<p>number = &quot;12345&quot;<\/p>\n<p>pattern = r&#39;^\\d+$&#39;<\/p>\n<p>is_match = re.match(pattern, number) is not None<\/p>\n<p>print(is_match)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3\u3001\u5339\u914d\u5b57\u6bcd\u548c\u6570\u5b57\u5b57\u7b26<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import re<\/p>\n<p>text = &quot;Hello123&quot;<\/p>\n<p>pattern = r&#39;^[A-Za-z0-9]+$&#39;<\/p>\n<p>is_match = re.match(pattern, text) is not None<\/p>\n<p>print(is_match)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u5229\u7528\u6761\u4ef6\u5224\u65ad<\/h3>\n<\/p>\n<p><p>\u901a\u8fc7\u6761\u4ef6\u5224\u65ad\u53ef\u4ee5\u7075\u6d3b\u5730\u5224\u65ad\u5b57\u7b26\u4e32\u7684\u5404\u79cd\u7279\u5f81\u3002\u4f8b\u5982\uff0c\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\uff0c\u6216\u8005\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n<p><h4>1\u3001\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">text = &quot;&quot;<\/p>\n<p>is_empty = text == &quot;&quot;<\/p>\n<p>print(is_empty)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5b50\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">text = &quot;Hello, World!&quot;<\/p>\n<p>cont<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>ns_substring = &quot;World&quot; in text<\/p>\n<p>print(contains_substring)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u53ea\u5305\u542b\u5b57\u6bcd\u6216\u6570\u5b57\uff0c\u5e76\u4e14\u957f\u5ea6\u5728\u67d0\u4e2a\u8303\u56f4\u5185\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import re<\/p>\n<p>def is_valid_string(text):<\/p>\n<p>    pattern = r&#39;^[A-Za-z0-9]+$&#39;<\/p>\n<p>    return re.match(pattern, text) is not None and 5 &lt;= len(text) &lt;= 10<\/p>\n<p>text = &quot;Hello123&quot;<\/p>\n<p>is_valid = is_valid_string(text)<\/p>\n<p>print(is_valid)  # \u8f93\u51fa: True<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u4ee5\u4e0a\u51e0\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728Python\u4e2d\u6709\u6548\u5730\u5224\u65ad\u5b57\u7b26\u4e32\u3002\u4e86\u89e3\u548c\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e2e\u52a9\u4f60\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u66f4\u597d\u5730\u5904\u7406\u5b57\u7b26\u4e32\u76f8\u5173\u7684\u903b\u8f91\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u5728Python\u4e2d\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b80\u5355\u7684\u6761\u4ef6\u8bed\u53e5\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\u3002\u53ef\u4ee5\u901a\u8fc7\u76f4\u63a5\u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u5e03\u5c14\u503c\u6765\u5b9e\u73b0\uff1a\u5982\u679c\u5b57\u7b26\u4e32\u4e3a\u7a7a\uff0c\u5219\u5176\u5e03\u5c14\u503c\u4e3a<code>False<\/code>\uff0c\u5426\u5219\u4e3a<code>True<\/code>\u3002\u4f8b\u5982\uff0c<code>if not my_string:<\/code>\u53ef\u4ee5\u7528\u6765\u5224\u65ad<code>my_string<\/code>\u662f\u5426\u4e3a\u7a7a\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u6d01\u800c\u76f4\u89c2\uff0c\u9002\u7528\u4e8e\u5feb\u901f\u68c0\u67e5\u3002<\/p>\n<p><strong>Python\u4e2d\u6709\u54ea\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5224\u65ad\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u662f\u5426\u7b26\u5408\u7279\u5b9a\u683c\u5f0f\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6a21\u5757<code>re<\/code>\u6765\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u7b26\u5408\u7279\u5b9a\u683c\u5f0f\u3002\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u7136\u540e\u4f7f\u7528<code>re.match()<\/code>\u6216<code>re.search()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u6ee1\u8db3\u9884\u671f\u7684\u683c\u5f0f\u3002\u6b64\u5916\uff0cPython\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5\u5982<code>str.isdigit()<\/code>\u548c<code>str.isalpha()<\/code>\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u53ea\u5305\u542b\u6570\u5b57\u6216\u5b57\u6bcd\u3002<\/p>\n<p><strong>\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u5728Python\u4e2d\u662f\u5426\u76f8\u7b49\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u7b49\u53f7<code>==<\/code>\u6765\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002\u8fd9\u4e2a\u6bd4\u8f83\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\uff0c\u5373<code>&#39;Hello&#39;<\/code>\u4e0e<code>&#39;hello&#39;<\/code>\u88ab\u89c6\u4e3a\u4e0d\u540c\u7684\u5b57\u7b26\u4e32\u3002\u5982\u679c\u9700\u8981\u8fdb\u884c\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u6bd4\u8f83\uff0c\u53ef\u4ee5\u5c06\u4e24\u4e2a\u5b57\u7b26\u4e32\u90fd\u8f6c\u6362\u4e3a\u5c0f\u5199\u6216\u5927\u5199\u540e\u518d\u8fdb\u884c\u6bd4\u8f83\uff0c\u4f8b\u5982\uff1a<code>str1.lower() == str2.lower()<\/code>\u3002\u8fd9\u79cd\u65b9\u6cd5\u786e\u4fdd\u4e86\u6bd4\u8f83\u65f6\u4e0d\u53d7\u5927\u5c0f\u5199\u5f71\u54cd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u5224\u65ad\u5b57\u7b26\u4e32\u7684\u51e0\u79cd\u65b9\u6cd5\u6709\uff1a\u68c0\u67e5\u5b57\u7b26\u4e32\u7c7b\u578b\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u3001\u5229\u7528\u6761\u4ef6\u5224\u65ad\u3002 \u5176\u4e2d\uff0c [&hellip;]","protected":false},"author":3,"featured_media":1050322,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1050316"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1050316"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1050316\/revisions"}],"predecessor-version":[{"id":1050323,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1050316\/revisions\/1050323"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1050322"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1050316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1050316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1050316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}