{"id":1068001,"date":"2024-12-31T16:39:25","date_gmt":"2024-12-31T08:39:25","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1068001.html"},"modified":"2024-12-31T16:39:27","modified_gmt":"2024-12-31T08:39:27","slug":"python%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%a6%82%e4%bd%95%e5%8c%b9%e9%85%8d%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1068001.html","title":{"rendered":"python\u5b57\u7b26\u4e32\u5982\u4f55\u5339\u914d\u5b57\u7b26\u4e32"},"content":{"rendered":"

\"python\u5b57\u7b26\u4e32\u5982\u4f55\u5339\u914d\u5b57\u7b26\u4e32\"<\/p>\n

Python\u5b57\u7b26\u4e32\u5339\u914d\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528find()\u65b9\u6cd5\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u3001in\u5173\u952e\u5b57\u3001startswith()\u65b9\u6cd5\u3001endswith()\u65b9\u6cd5\u3002<\/strong>\u8fd9\u4e9b\u65b9\u6cd5\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u573a\u666f\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5176\u4e2d\u4e00\u79cd\u65b9\u6cd5\uff0c\u5e76\u8fdb\u4e00\u6b65\u5c55\u5f00\u4ecb\u7ecd\u5176\u4ed6\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong> \u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u4e2d\u641c\u7d22\u7279\u5b9a\u6a21\u5f0f\u3002Python\u7684re<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u5bf9\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u652f\u6301\u3002\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u53ef\u4ee5\u8fdb\u884c\u590d\u6742\u7684\u5b57\u7b26\u4e32\u5339\u914d\uff0c\u5305\u62ec\u5339\u914d\u5355\u4e2a\u5b57\u7b26\u3001\u591a\u5b57\u7b26\u3001\u5206\u7ec4\u5339\u914d\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u5b57\u7b26\u4e32\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n

import re<\/p>\n
pattern = r'\\bhello\\b'<\/p>\n
text = 'hello world, hello Python'<\/p>\n
matches = re.findall(pattern, text)<\/p>\n
print(matches)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\\b<\/code>\u8868\u793a\u5355\u8bcd\u8fb9\u754c\uff0chello<\/code>\u662f\u6211\u4eec\u8981\u5339\u914d\u7684\u5b57\u7b26\u4e32\uff0cre.findall()<\/code>\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5217\u8868\uff0c\u5305\u542b\u6240\u6709\u5339\u914d\u7684\u5b50\u4e32\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u4f7f\u7528find()\u65b9\u6cd5<\/h3>\n<\/p>\n
find()\u65b9\u6cd5\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u4e2d\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u3002\u5982\u679c\u627e\u5230\u5b50\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u7d22\u5f15\uff1b\u5426\u5219\uff0c\u8fd4\u56de-1\u3002<\/p>\n<\/p>\n
text = "hello world"<\/p>\n
index = text.find("world")<\/p>\n
if index != -1:<\/p>\n
    print(f"Found 'world' at index {index}")<\/p>\n
else:<\/p>\n
    print("Did not find 'world'")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cfind()<\/code>\u65b9\u6cd5\u627e\u5230\u4e86"world"\u5b50\u5b57\u7b26\u4e32\uff0c\u5e76\u8fd4\u56de\u4e86\u5b83\u7684\u8d77\u59cb\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528in\u5173\u952e\u5b57<\/h3>\n<\/p>\n
in\u5173\u952e\u5b57\u53ef\u4ee5\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\u3002<\/p>\n<\/p>\n
text = "hello world"<\/p>\n
if "world" in text:<\/p>\n
    print("Found 'world'")<\/p>\n
else:<\/p>\n
    print("Did not find 'world'")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528in\u5173\u952e\u5b57\u975e\u5e38\u76f4\u89c2\u548c\u6613\u4e8e\u7406\u89e3\uff0c\u9002\u7528\u4e8e\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u5339\u914d\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528startswith()\u548cendswith()\u65b9\u6cd5<\/h3>\n<\/p>\n
startswith()\u65b9\u6cd5\u7528\u4e8e\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u4ee5\u7279\u5b9a\u5b50\u5b57\u7b26\u4e32\u5f00\u5934\uff0cendswith()\u65b9\u6cd5\u7528\u4e8e\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u4ee5\u7279\u5b9a\u5b50\u5b57\u7b26\u4e32\u7ed3\u5c3e\u3002<\/p>\n<\/p>\n
text = "hello world"<\/p>\n
if text.startswith("hello"):<\/p>\n
    print("String starts with 'hello'")<\/p>\n
if text.endswith("world"):<\/p>\n
    print("String ends with 'world'")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u975e\u5e38\u9002\u5408\u7528\u4e8e\u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u7279\u5b9a\u90e8\u5206\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/h3>\n<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u975e\u5e38\u9002\u5408\u7528\u4e8e\u590d\u6742\u7684\u5b57\u7b26\u4e32\u5339\u914d\u3002Python\u7684re<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u5bf9\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u652f\u6301\u3002<\/p>\n<\/p>\n
import re<\/p>\n
pattern = r'\\bworld\\b'<\/p>\n
text = 'hello world, hello Python'<\/p>\n
matches = re.findall(pattern, text)<\/p>\n
print(matches)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cre.findall()<\/code>\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5217\u8868\uff0c\u5305\u542b\u6240\u6709\u5339\u914d\u7684\u5b50\u4e32\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u8be6\u7ec6\u4ecb\u7ecd<\/h3>\n<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5b57\u7b26\u4e32\u5339\u914d\u5de5\u5177\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u7528\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u6a21\u5f0f\u548c\u51fd\u6570\u3002<\/p>\n<\/p>\n
1\u3001\u57fa\u672c\u6a21\u5f0f<\/h4>\n<\/p>\n