{"id":1052752,"date":"2024-12-31T14:27:47","date_gmt":"2024-12-31T06:27:47","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1052752.html"},"modified":"2024-12-31T14:27:49","modified_gmt":"2024-12-31T06:27:49","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8python%e4%b8%8astr%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1052752.html","title":{"rendered":"\u5982\u4f55\u5728Python\u4e0astr\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"

\"\u5982\u4f55\u5728Python\u4e0astr\u4ec0\u4e48\u610f\u601d\"<\/p>\n

\u5728Python\u4e2d\uff0cstr\u4ee3\u8868\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/strong> \u5b57\u7b26\u4e32\u662f\u7531\u4e00\u7cfb\u5217\u5b57\u7b26\u7ec4\u6210\u7684\u5e8f\u5217\uff0c\u7528\u4e8e\u8868\u793a\u6587\u672c\u6570\u636e\u3002\u5b57\u7b26\u4e32\u53ef\u4ee5\u5305\u62ec\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u7b26\u53f7\u548c\u7a7a\u767d\u5b57\u7b26\u3002Python \u63d0\u4f9b\u4e86\u591a\u79cd\u64cd\u4f5c\u548c\u65b9\u6cd5\u6765\u5904\u7406\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdPython\u4e2d\u5b57\u7b26\u4e32\u7684\u5b9a\u4e49\u3001\u521b\u5efa\u3001\u64cd\u4f5c\u548c\u5e38\u89c1\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5b57\u7b26\u4e32\u7684\u5b9a\u4e49\u548c\u521b\u5efa<\/h3>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528\u5355\u5f15\u53f7\u3001\u53cc\u5f15\u53f7\u6216\u4e09\u5f15\u53f7\u62ec\u8d77\u6765\u3002\u5355\u5f15\u53f7\u548c\u53cc\u5f15\u53f7\u7684\u4f7f\u7528\u6ca1\u6709\u533a\u522b\uff0c\u53ea\u662f\u4e3a\u4e86\u65b9\u4fbf\u5728\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u5f15\u53f7\u800c\u4e0d\u9700\u8981\u8f6c\u4e49\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

# \u4f7f\u7528\u5355\u5f15\u53f7<\/p>\n
str1 = 'Hello, World!'<\/p>\n
\u4f7f\u7528\u53cc\u5f15\u53f7<\/strong><\/h2>\n
str2 = "Hello, World!"<\/p>\n
\u4f7f\u7528\u4e09\u5f15\u53f7\uff08\u591a\u884c\u5b57\u7b26\u4e32\uff09<\/strong><\/h2>\n
str3 = '''Hello,<\/p>\n
World!'''<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\uff0c\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u5c31\u4e0d\u80fd\u88ab\u66f4\u6539\u3002\u5982\u679c\u9700\u8981\u4fee\u6539\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5b57\u7b26\u4e32\u7684\u57fa\u672c\u64cd\u4f5c<\/h3>\n<\/p>\n
Python \u63d0\u4f9b\u4e86\u8bb8\u591a\u5185\u7f6e\u64cd\u4f5c\u6765\u5904\u7406\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u64cd\u4f5c\uff1a<\/p>\n<\/p>\n
1\u3001\u8fde\u63a5\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528\u52a0\u53f7\uff08+<\/code>\uff09\u8fd0\u7b97\u7b26\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u5728\u4e00\u8d77\uff1a<\/p>\n<\/p>\n
str1 = 'Hello'<\/p>\n
str2 = 'World'<\/p>\n
result = str1 + ', ' + str2 + '!'<\/p>\n
print(result)  # \u8f93\u51fa\uff1aHello, World!<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u91cd\u590d\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528\u4e58\u53f7\uff08*<\/code>\uff09\u8fd0\u7b97\u7b26\u5c06\u5b57\u7b26\u4e32\u91cd\u590d\u591a\u6b21\uff1a<\/p>\n<\/p>\n
str1 = 'Hello'<\/p>\n
result = str1 * 3<\/p>\n
print(result)  # \u8f93\u51fa\uff1aHelloHelloHello<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u7d22\u5f15\u548c\u5207\u7247<\/h4>\n<\/p>\n
\u5b57\u7b26\u4e32\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u5355\u4e2a\u5b57\u7b26\uff0c\u901a\u8fc7\u5207\u7247\u8bbf\u95ee\u5b50\u5b57\u7b26\u4e32\u3002\u7d22\u5f15\u4ece0\u5f00\u59cb\uff0c\u8d1f\u7d22\u5f15\u4ece\u5b57\u7b26\u4e32\u672b\u5c3e\u5f00\u59cb\u8ba1\u6570\uff1a<\/p>\n<\/p>\n
str1 = 'Hello, World!'<\/p>\n
print(str1[0])   # \u8f93\u51fa\uff1aH<\/p>\n
print(str1[-1])  # \u8f93\u51fa\uff1a!<\/p>\n
print(str1[0:5]) # \u8f93\u51fa\uff1aHello<\/p>\n
print(str1[7:])  # \u8f93\u51fa\uff1aWorld!<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u5b57\u7b26\u4e32\u5e38\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
Python \u63d0\u4f9b\u4e86\u8bb8\u591a\u5185\u7f6e\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5\uff0c\u7528\u4e8e\u68c0\u67e5\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5927\u591a\u6570\u4e0d\u4f1a\u6539\u53d8\u539f\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
1\u3001\u5927\u5c0f\u5199\u8f6c\u6362<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528 upper()<\/code>\u3001lower()<\/code>\u3001capitalize()<\/code> \u548c title()<\/code> \u65b9\u6cd5\u8f6c\u6362\u5b57\u7b26\u4e32\u7684\u5927\u5c0f\u5199\uff1a<\/p>\n<\/p>\n
str1 = 'hello, world!'<\/p>\n
print(str1.upper())       # \u8f93\u51fa\uff1aHELLO, WORLD!<\/p>\n
print(str1.lower())       # \u8f93\u51fa\uff1ahello, world!<\/p>\n
print(str1.capitalize())  # \u8f93\u51fa\uff1aHello, world!<\/p>\n
print(str1.title())       # \u8f93\u51fa\uff1aHello, World!<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u53bb\u9664\u7a7a\u767d\u5b57\u7b26<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528 strip()<\/code>\u3001lstrip()<\/code> \u548c rstrip()<\/code> \u65b9\u6cd5\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7684\u7a7a\u767d\u5b57\u7b26\uff1a<\/p>\n<\/p>\n
str1 = '   Hello, World!   '<\/p>\n
print(str1.strip())   # \u8f93\u51fa\uff1aHello, World!<\/p>\n
print(str1.lstrip())  # \u8f93\u51fa\uff1aHello, World!   <\/p>\n
print(str1.rstrip())  # \u8f93\u51fa\uff1a   Hello, World!<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u67e5\u627e\u548c\u66ff\u6362<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528 find()<\/code>\u3001rfind()<\/code>\u3001index()<\/code> \u548c rindex()<\/code> \u65b9\u6cd5\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e\uff0c\u4f7f\u7528 replace()<\/code> \u65b9\u6cd5\u66ff\u6362\u5b50\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n
str1 = 'Hello, World!'<\/p>\n
print(str1.find('World'))     # \u8f93\u51fa\uff1a7<\/p>\n
print(str1.rfind('o'))        # \u8f93\u51fa\uff1a8<\/p>\n
print(str1.replace('World', 'Python'))  # \u8f93\u51fa\uff1aHello, Python!<\/p>\n
<\/code><\/pre>\n<\/p>\n
4\u3001\u62c6\u5206\u548c\u5408\u5e76<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528 split()<\/code> \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u62c6\u5206\u4e3a\u5217\u8868\uff0c\u4f7f\u7528 join()<\/code> \u65b9\u6cd5\u5c06\u5217\u8868\u5408\u5e76\u4e3a\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n
str1 = 'Hello, World!'<\/p>\n
result = str1.split(', ')<\/p>\n
print(result)  # \u8f93\u51fa\uff1a['Hello', 'World!']<\/p>\n
list1 = ['Hello', 'World']<\/p>\n
result = ', '.join(list1)<\/p>\n
print(result)  # \u8f93\u51fa\uff1aHello, World<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u5b57\u7b26\u4e32\u683c\u5f0f\u5316<\/h3>\n<\/p>\n
Python \u63d0\u4f9b\u4e86\u591a\u79cd\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u4f7f\u5f97\u63d2\u5165\u53d8\u91cf\u548c\u8868\u8fbe\u5f0f\u53d8\u5f97\u7b80\u5355\u6613\u8bfb\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
1\u3001\u4f7f\u7528\u767e\u5206\u53f7\uff08%\uff09\u64cd\u4f5c\u7b26<\/h4>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7c7b\u4f3c\u4e8eC\u8bed\u8a00\u4e2d\u7684printf\u51fd\u6570\uff1a<\/p>\n<\/p>\n
name = 'John'<\/p>\n
age = 30<\/p>\n
print('My name is %s and I am %d years old.' % (name, age))<\/p>\n
\u8f93\u51fa\uff1aMy name is John and I am 30 years old.<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u4f7f\u7528 format()<\/code> \u65b9\u6cd5<\/h4>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u66f4\u52a0\u7075\u6d3b\u548c\u5f3a\u5927\uff1a<\/p>\n<\/p>\n
name = 'John'<\/p>\n
age = 30<\/p>\n
print('My name is {} and I am {} years old.'.format(name, age))<\/p>\n
\u8f93\u51fa\uff1aMy name is John and I am 30 years old.<\/strong><\/h2>\n
\u4f7f\u7528\u4f4d\u7f6e\u53c2\u6570<\/strong><\/h2>\n
print('My name is {0} and I am {1} years old.'.format(name, age))<\/p>\n
\u8f93\u51fa\uff1aMy name is John and I am 30 years old.<\/strong><\/h2>\n
\u4f7f\u7528\u5173\u952e\u5b57\u53c2\u6570<\/strong><\/h2>\n
print('My name is {name} and I am {age} years old.'.format(name=name, age=age))<\/p>\n
\u8f93\u51fa\uff1aMy name is John and I am 30 years old.<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u4f7f\u7528 f-strings\uff08Python 3.6+\uff09<\/h4>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u662f\u6700\u7b80\u6d01\u548c\u63a8\u8350\u7684\u65b9\u5f0f\uff1a<\/p>\n<\/p>\n
name = 'John'<\/p>\n
age = 30<\/p>\n
print(f'My name is {name} and I am {age} years old.')<\/p>\n
\u8f93\u51fa\uff1aMy name is John and I am 30 years old.<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u5b57\u7b26\u4e32\u7f16\u7801\u548c\u89e3\u7801<\/h3>\n<\/p>\n
\u5728\u5904\u7406\u6587\u672c\u6570\u636e\u65f6\uff0c\u7ecf\u5e38\u9700\u8981\u5c06\u5b57\u7b26\u4e32\u7f16\u7801\u4e3a\u5b57\u8282\uff0c\u6216\u8005\u5c06\u5b57\u8282\u89e3\u7801\u4e3a\u5b57\u7b26\u4e32\u3002Python \u63d0\u4f9b\u4e86 encode()<\/code> \u548c decode()<\/code> \u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/p>\n
1\u3001\u7f16\u7801\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528 encode()<\/code> \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u7f16\u7801\u4e3a\u5b57\u8282\uff1a<\/p>\n<\/p>\n
str1 = 'Hello, World!'<\/p>\n
encoded_str = str1.encode('utf-8')<\/p>\n
print(encoded_str)  # \u8f93\u51fa\uff1ab'Hello, World!'<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u89e3\u7801\u5b57\u8282<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528 decode()<\/code> \u65b9\u6cd5\u5c06\u5b57\u8282\u89e3\u7801\u4e3a\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n
encoded_str = b'Hello, World!'<\/p>\n
decoded_str = encoded_str.decode('utf-8')<\/p>\n
print(decoded_str)  # \u8f93\u51fa\uff1aHello, World!<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u5b57\u7b26\u4e32\u7684\u5e38\u89c1\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
1\u3001\u5904\u7406\u7528\u6237\u8f93\u5165<\/h4>\n<\/p>\n
\u5728\u8bb8\u591a\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u9700\u8981\u5904\u7406\u7528\u6237\u8f93\u5165\u5e76\u5bf9\u5176\u8fdb\u884c\u9a8c\u8bc1\u548c\u5904\u7406\u3002\u5b57\u7b26\u4e32\u64cd\u4f5c\u5728\u8fd9\u79cd\u573a\u666f\u4e0b\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n
user_input = input('Enter your name: ').strip()<\/p>\n
if user_input:<\/p>\n
    print(f'Hello, {user_input}!')<\/p>\n
else:<\/p>\n
    print('You did not enter a name.')<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u5904\u7406\u6587\u4ef6\u548c\u7f51\u7edc\u6570\u636e<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u6587\u4ef6\u548c\u7f51\u7edc\u6570\u636e\u65f6\uff0c\u7ecf\u5e38\u9700\u8981\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u5e76\u6309\u884c\u5904\u7406\uff1a<\/p>\n<\/p>\n
with open('example.txt', 'r') as file:<\/p>\n
    for line in file:<\/p>\n
        print(line.strip())<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u751f\u6210\u52a8\u6001\u5185\u5bb9<\/h4>\n<\/p>\n
\u5728\u751f\u6210\u52a8\u6001\u5185\u5bb9\uff08\u4f8b\u5982\u7f51\u9875\u3001\u62a5\u544a\u7b49\uff09\u65f6\uff0c\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u548c\u64cd\u4f5c\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u751f\u6210\u4e00\u4efd\u5305\u542b\u7528\u6237\u4fe1\u606f\u7684\u62a5\u544a\uff1a<\/p>\n<\/p>\n
user_info = {'name': 'John', 'age': 30, 'emAI<\/a>l': 'john@example.com'}<\/p>\n
report = f"""<\/p>\n
User Report<\/p>\n
-----------<\/p>\n
Name: {user_info['name']}<\/p>\n
Age: {user_info['age']}<\/p>\n
Email: {user_info['email']}<\/p>\n
"""<\/p>\n
print(report)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u5904\u7406\u6587\u672c\u6570\u636e\u7684\u57fa\u672c\u7c7b\u578b\u3002\u901a\u8fc7\u4e86\u89e3\u5b57\u7b26\u4e32\u7684\u5b9a\u4e49\u3001\u521b\u5efa\u3001\u57fa\u672c\u64cd\u4f5c\u548c\u5e38\u89c1\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5904\u7406\u548c\u64cd\u4f5c\u6587\u672c\u6570\u636e<\/strong>\u3002\u6b64\u5916\uff0c\u638c\u63e1\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u5316\u3001\u7f16\u7801\u548c\u89e3\u7801\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u5404\u79cd\u5e94\u7528\u573a\u666f\u4e2d\u7075\u6d3b\u5730\u4f7f\u7528\u5b57\u7b26\u4e32\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u7406\u89e3\u548c\u4f7f\u7528Python\u5b57\u7b26\u4e32\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
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str\u7c7b\u578b\u5728Python\u4e2d\u662f\u7528\u4e8e\u8868\u793a\u5b57\u7b26\u4e32\u7684\u6570\u636e\u7c7b\u578b\u3002\u5b83\u53ef\u4ee5\u5b58\u50a8\u6587\u672c\u6570\u636e\uff0c\u6bd4\u5982\u5355\u8bcd\u3001\u53e5\u5b50\u6216\u4efb\u4f55\u5b57\u7b26\u7684\u7ec4\u5408\u3002\u65e0\u8bba\u662f\u5904\u7406\u7528\u6237\u8f93\u5165\u3001\u6587\u4ef6\u5185\u5bb9\u8fd8\u662f\u7f51\u7edc\u6570\u636e\uff0cstr\u7c7b\u578b\u90fd\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002\u4f7f\u7528str\u7c7b\u578b\u65f6\uff0c\u53ef\u4ee5\u5229\u7528\u4e30\u5bcc\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u65b9\u6cd5\uff0c\u5982\u62fc\u63a5\u3001\u5207\u7247\u548c\u67e5\u627e\u7b49\uff0c\u6765\u5904\u7406\u548c\u4fee\u6539\u6587\u672c\u3002<\/p>\n
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