{"id":1105737,"date":"2025-01-08T16:33:47","date_gmt":"2025-01-08T08:33:47","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1105737.html"},"modified":"2025-01-08T16:33:50","modified_gmt":"2025-01-08T08:33:50","slug":"python%e5%a6%82%e4%bd%95%e6%a0%b9%e6%8d%ae%e6%9d%a1%e4%bb%b6%e6%8a%bd%e5%8f%96%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1105737.html","title":{"rendered":"python\u5982\u4f55\u6839\u636e\u6761\u4ef6\u62bd\u53d6\u5b57\u7b26\u4e32"},"content":{"rendered":"

\"python\u5982\u4f55\u6839\u636e\u6761\u4ef6\u62bd\u53d6\u5b57\u7b26\u4e32\"<\/p>\n

\u6839\u636e\u6761\u4ef6\u62bd\u53d6\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u6709\u5f88\u591a\u79cd\uff0c\u6bd4\u5982\u4f7f\u7528\u5207\u7247\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u3001\u5b57\u7b26\u4e32\u65b9\u6cd5\u7b49\u3002\u5177\u4f53\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u3001\u5217\u8868\u63a8\u5bfc\u5f0f\u3001\u5207\u7247\u7b49\u65b9\u6cd5\u3002<\/strong>\u5176\u4e2d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u529f\u80fd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u6839\u636e\u590d\u6742\u7684\u6761\u4ef6\u63d0\u53d6\u5b57\u7b26\u4e32\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u8be6\u7ec6\u63a2\u8ba8\u8fd9\u4e9b\u65b9\u6cd5\u4ee5\u53ca\u5b83\u4eec\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5b57\u7b26\u4e32\u65b9\u6cd5<\/p>\n<\/p>\n

Python \u63d0\u4f9b\u4e86\u591a\u79cd\u5b57\u7b26\u4e32\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u6839\u636e\u6761\u4ef6\u62bd\u53d6\u5b57\u7b26\u4e32\u3002\u5e38\u89c1\u7684\u65b9\u6cd5\u6709 find<\/code>\u3001index<\/code>\u3001split<\/code>\u3001partition<\/code>\u3001startswith<\/code>\u3001endswith<\/code> \u7b49\u3002<\/p>\n<\/p>\n

1.1\u3001find \u548c index<\/p>\n<\/p>\n

find<\/code> \u65b9\u6cd5\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u627e\u4e0d\u5230\u5219\u8fd4\u56de -1\u3002index<\/code> \u65b9\u6cd5\u4e0e find<\/code> \u7c7b\u4f3c\uff0c\u4f46\u627e\u4e0d\u5230\u5b50\u5b57\u7b26\u4e32\u65f6\u4f1a\u629b\u51fa ValueError<\/code> \u5f02\u5e38\u3002<\/p>\n<\/p>\n

s = "Hello, world!"<\/p>\n
substring = "world"<\/p>\n
position = s.find(substring)<\/p>\n
if position != -1:<\/p>\n
    extracted = s[position:position + len(substring)]<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Substring not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
1.2\u3001split \u548c partition<\/p>\n<\/p>\n
split<\/code> \u65b9\u6cd5\u6839\u636e\u6307\u5b9a\u7684\u5206\u9694\u7b26\u5c06\u5b57\u7b26\u4e32\u62c6\u5206\u6210\u591a\u4e2a\u5b50\u5b57\u7b26\u4e32\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5217\u8868\u3002partition<\/code> \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u62c6\u5206\u6210\u4e09\u4e2a\u90e8\u5206\uff1a\u5206\u9694\u7b26\u524d\u7684\u90e8\u5206\u3001\u5206\u9694\u7b26\u672c\u8eab\u548c\u5206\u9694\u7b26\u540e\u7684\u90e8\u5206\u3002<\/p>\n<\/p>\n
s = "Hello, world!"<\/p>\n
delimiter = ","<\/p>\n
parts = s.split(delimiter)<\/p>\n
if len(parts) > 1:<\/p>\n
    extracted = parts[1].strip()  # \u53bb\u9664\u7a7a\u683c<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Delimiter not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
s = "Hello, world!"<\/p>\n
delimiter = ","<\/p>\n
before, sep, after = s.partition(delimiter)<\/p>\n
if sep:<\/p>\n
    extracted = after.strip()  # \u53bb\u9664\u7a7a\u683c<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Delimiter not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
1.3\u3001startswith \u548c endswith<\/p>\n<\/p>\n
startswith<\/code> \u548c endswith<\/code> \u65b9\u6cd5\u5206\u522b\u7528\u4e8e\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4ee5\u6307\u5b9a\u7684\u5b50\u5b57\u7b26\u4e32\u5f00\u5934\u6216\u7ed3\u5c3e\u3002<\/p>\n<\/p>\n
s = "Hello, world!"<\/p>\n
prefix = "Hello"<\/p>\n
if s.startswith(prefix):<\/p>\n
    extracted = s[len(prefix):].strip()<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Prefix not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
s = "Hello, world!"<\/p>\n
suffix = "world!"<\/p>\n
if s.endswith(suffix):<\/p>\n
    extracted = s[:-len(suffix)].strip()<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Suffix not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u6b63\u5219\u8868\u8fbe\u5f0f<\/p>\n<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6587\u672c\u5904\u7406\u5de5\u5177\uff0c\u53ef\u4ee5\u6839\u636e\u590d\u6742\u7684\u6761\u4ef6\u5339\u914d\u548c\u63d0\u53d6\u5b57\u7b26\u4e32\u3002Python \u7684 re<\/code> \u6a21\u5757\u63d0\u4f9b\u4e86\u5bf9\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u652f\u6301\u3002<\/p>\n<\/p>\n
2.1\u3001\u57fa\u672c\u7528\u6cd5<\/p>\n<\/p>\n
\u4f7f\u7528 re.search<\/code> \u6216 re.findall<\/code> \u65b9\u6cd5\u6839\u636e\u6b63\u5219\u8868\u8fbe\u5f0f\u6a21\u5f0f\u5339\u914d\u5b57\u7b26\u4e32\u3002re.search<\/code> \u8fd4\u56de\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u5bf9\u8c61\uff0cre.findall<\/code> \u8fd4\u56de\u6240\u6709\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u5217\u8868\u3002<\/p>\n<\/p>\n
import re<\/p>\n
s = "Hello, world!"<\/p>\n
pattern = r"world"<\/p>\n
match = re.search(pattern, s)<\/p>\n
if match:<\/p>\n
    extracted = match.group()<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Pattern not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
import re<\/p>\n
s = "Hello, world! Welcome to the world of Python."<\/p>\n
pattern = r"world"<\/p>\n
matches = re.findall(pattern, s)<\/p>\n
if matches:<\/p>\n
    for match in matches:<\/p>\n
        print(f"Extracted substring: {match}")<\/p>\n
else:<\/p>\n
    print("Pattern not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
2.2\u3001\u4f7f\u7528\u6355\u83b7\u7ec4<\/p>\n<\/p>\n
\u6355\u83b7\u7ec4\u53ef\u4ee5\u63d0\u53d6\u5339\u914d\u6a21\u5f0f\u4e2d\u7684\u7279\u5b9a\u90e8\u5206\u3002\u4f7f\u7528\u5706\u62ec\u53f7 ()<\/code> \u5b9a\u4e49\u6355\u83b7\u7ec4\uff0c\u5e76\u4f7f\u7528 group<\/code> \u65b9\u6cd5\u8bbf\u95ee\u5339\u914d\u7684\u5185\u5bb9\u3002<\/p>\n<\/p>\n
import re<\/p>\n
s = "Hello, world!"<\/p>\n
pattern = r"(world)"<\/p>\n
match = re.search(pattern, s)<\/p>\n
if match:<\/p>\n
    extracted = match.group(1)<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Pattern not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u5217\u8868\u63a8\u5bfc\u5f0f<\/p>\n<\/p>\n
\u5217\u8868\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u65b9\u5f0f\uff0c\u7528\u4e8e\u6839\u636e\u6761\u4ef6\u751f\u6210\u5217\u8868\u3002\u53ef\u4ee5\u7ed3\u5408\u5b57\u7b26\u4e32\u65b9\u6cd5\u548c\u5217\u8868\u63a8\u5bfc\u5f0f\u6765\u63d0\u53d6\u6ee1\u8db3\u6761\u4ef6\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
s = "Hello, world! Welcome to the world of Python."<\/p>\n
words = s.split()<\/p>\n
extracted = [word for word in words if "world" in word]<\/p>\n
print(f"Extracted substrings: {extracted}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u5207\u7247<\/p>\n<\/p>\n
\u5207\u7247\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u6839\u636e\u7d22\u5f15\u63d0\u53d6\u5b57\u7b26\u4e32\u7684\u7279\u5b9a\u90e8\u5206\u3002\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\uff0c\u53ef\u4ee5\u5b9e\u73b0\u590d\u6742\u7684\u63d0\u53d6\u903b\u8f91\u3002<\/p>\n<\/p>\n
4.1\u3001\u6839\u636e\u56fa\u5b9a\u4f4d\u7f6e\u63d0\u53d6<\/p>\n<\/p>\n
\u5982\u679c\u77e5\u9053\u5b50\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u4f7f\u7528\u5207\u7247\u76f4\u63a5\u63d0\u53d6\u3002<\/p>\n<\/p>\n
s = "Hello, world!"<\/p>\n
start = 7<\/p>\n
end = 12<\/p>\n
extracted = s[start:end]<\/p>\n
print(f"Extracted substring: {extracted}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
4.2\u3001\u7ed3\u5408\u6761\u4ef6\u5224\u65ad<\/p>\n<\/p>\n
\u53ef\u4ee5\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\u548c\u5207\u7247\u5b9e\u73b0\u590d\u6742\u7684\u63d0\u53d6\u903b\u8f91\u3002<\/p>\n<\/p>\n
s = "Hello, world!"<\/p>\n
if "world" in s:<\/p>\n
    start = s.index("world")<\/p>\n
    end = start + len("world")<\/p>\n
    extracted = s[start:end]<\/p>\n
    print(f"Extracted substring: {extracted}")<\/p>\n
else:<\/p>\n
    print("Substring not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u603b\u7ed3<\/p>\n<\/p>\n
\u6839\u636e\u6761\u4ef6\u62bd\u53d6\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u5177\u4f53\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u9700\u6c42\u548c\u5b57\u7b26\u4e32\u7684\u590d\u6742\u5ea6\u3002\u5b57\u7b26\u4e32\u65b9\u6cd5\u9002\u5408\u5904\u7406\u7b80\u5355\u7684\u6761\u4ef6\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u9002\u5408\u5904\u7406\u590d\u6742\u7684\u6a21\u5f0f\u5339\u914d\uff0c\u5217\u8868\u63a8\u5bfc\u5f0f\u548c\u5207\u7247\u5219\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u81ea\u5b9a\u4e49\u7684\u63d0\u53d6\u903b\u8f91\u3002\u901a\u8fc7\u7ed3\u5408\u4e0d\u540c\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u4ece\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u8fc7\u6ee4\u5b57\u7b26\u4e32\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u3001filter\u51fd\u6570\u6216\u8005\u6b63\u5219\u8868\u8fbe\u5f0f\u7b49\u65b9\u6cd5\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u63d0\u53d6\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u8f7b\u677e\u5730\u4ece\u5b57\u7b26\u4e32\u5217\u8868\u4e2d\u7b5b\u9009\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u9879\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u7b5b\u9009\u51fa\u957f\u5ea6\u5927\u4e8e3\u7684\u5b57\u7b26\u4e32\uff1a  <\/p>\n
strings = ["apple", "is", "banana", "cat"]\nfiltered_strings = [s for s in strings if len(s) > 3]\nprint(filtered_strings)  # \u8f93\u51fa: ['apple', 'banana']\n<\/code><\/pre>\n
\u5728Python\u4e2d\u5982\u4f55\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u63d0\u53d6\u7b26\u5408\u6761\u4ef6\u7684\u5b57\u7b26\u4e32\uff1f<\/strong>
\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5904\u7406\u5b57\u7b26\u4e32\u7684\u5f3a\u5927\u5de5\u5177\u3002\u5728Python\u4e2d\uff0c\u4f7f\u7528re<\/code>\u6a21\u5757\u53ef\u4ee5\u8f7b\u677e\u63d0\u53d6\u7b26\u5408\u7279\u5b9a\u6a21\u5f0f\u7684\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u63d0\u53d6\u6240\u6709\u5305\u542b\u6570\u5b57\u7684\u5b57\u7b26\u4e32\uff1a  <\/p>\n
import re\n\ntext = "abc123, def456, ghi"\nmatches = re.findall(r'\\b\\w*\\d+\\w*\\b', text)\nprint(matches)  # \u8f93\u51fa: ['abc123', 'def456']\n<\/code><\/pre>\n
\u6709\u54ea\u4e9b\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u6211\u62bd\u53d6\u7b26\u5408\u6761\u4ef6\u7684\u5b57\u7b26\u4e32\uff1f<\/strong>
Python\u63d0\u4f9b\u4e86\u591a\u79cd\u5b57\u7b26\u4e32\u65b9\u6cd5\uff0c\u5982startswith()<\/code>\u3001endswith()<\/code>\u3001find()<\/code>\u548csplit()<\/code>\u7b49\uff0c\u80fd\u591f\u5e2e\u52a9\u7528\u6237\u6839\u636e\u4e0d\u540c\u6761\u4ef6\u63d0\u53d6\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u4f7f\u7528startswith()<\/code>\u53ef\u4ee5\u7b5b\u9009\u51fa\u4ee5\u7279\u5b9a\u5b57\u7b26\u5f00\u5934\u7684\u5b57\u7b26\u4e32\uff1a  <\/p>\n
strings = ["apple", "banana", "avocado", "berry"]\nfiltered_strings = [s for s in strings if s.startswith('a')]\nprint(filtered_strings)  # \u8f93\u51fa: ['apple', 'avocado']\n<\/code><\/pre>\n
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