{"id":1104504,"date":"2025-01-08T16:21:21","date_gmt":"2025-01-08T08:21:21","guid":{"rendered":""},"modified":"2025-01-08T16:21:24","modified_gmt":"2025-01-08T08:21:24","slug":"python3%e4%b8%ad%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%a6%82%e4%bd%95%e6%af%94%e8%be%83","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1104504.html","title":{"rendered":"python3\u4e2d\u5b57\u7b26\u4e32\u5982\u4f55\u6bd4\u8f83"},"content":{"rendered":"

\"python3\u4e2d\u5b57\u7b26\u4e32\u5982\u4f55\u6bd4\u8f83\"<\/p>\n

Python3\u4e2d\u5b57\u7b26\u4e32\u6bd4\u8f83\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528\u5173\u7cfb\u8fd0\u7b97\u7b26\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u5ffd\u7565\u5927\u5c0f\u5199\u6bd4\u8f83\u3001\u5bf9\u6bd4\u5b57\u7b26\u4e32\u957f\u5ea6\u3001\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u7b49<\/strong>\u3002\u5176\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u662f\u4f7f\u7528\u5173\u7cfb\u8fd0\u7b97\u7b26\uff0c\u80fd\u591f\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u5b57\u5178\u5e8f\u3002\u5173\u7cfb\u8fd0\u7b97\u7b26\u5305\u62ec\uff1a==<\/code>\u3001!=<\/code>\u3001><\/code>\u3001<<\/code>\u3001>=<\/code>\u3001<=<\/code><\/strong>\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 ==<\/code> \u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\uff0c\u4f7f\u7528 <<\/code> \u548c ><\/code> \u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u5b57\u5178\u5e8f\u3002\u5982\u679c\u9700\u8981\u5ffd\u7565\u5927\u5c0f\u5199\u6bd4\u8f83\uff0c\u53ef\u4ee5\u5148\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u540c\u4e00\u5927\u5c0f\u5199\u3002\u4ee5\u4e0b\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5173\u7cfb\u8fd0\u7b97\u7b26\u6bd4\u8f83<\/h3>\n<\/p>\n

\u5728Python3\u4e2d\uff0c\u5b57\u7b26\u4e32\u53ef\u4ee5\u901a\u8fc7\u5173\u7cfb\u8fd0\u7b97\u7b26\u76f4\u63a5\u8fdb\u884c\u6bd4\u8f83\u3002\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u5305\u62ec\uff1a==<\/code>\u3001!=<\/code>\u3001><\/code>\u3001<<\/code>\u3001>=<\/code>\u3001<=<\/code>\u3002\u5173\u7cfb\u8fd0\u7b97\u7b26\u6bd4\u8f83\u7684\u4f9d\u636e\u662f\u5b57\u7b26\u4e32\u7684\u5b57\u5178\u5e8f\u3002<\/p>\n<\/p>\n

1. ==<\/code> \u548c !=<\/code><\/h4>\n<\/p>\n

==<\/code> \u7528\u4e8e\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\uff0c!=<\/code> \u7528\u4e8e\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e0d\u76f8\u7b49\u3002\u4e24\u8005\u7684\u6bd4\u8f83\u90fd\u533a\u5206\u5927\u5c0f\u5199\u3002<\/p>\n<\/p>\n

str1 = "apple"<\/p>\n
str2 = "Apple"<\/p>\n
str3 = "apple"<\/p>\n
print(str1 == str2)  # \u8f93\u51fa: False<\/p>\n
print(str1 == str3)  # \u8f93\u51fa: True<\/p>\n
print(str1 != str2)  # \u8f93\u51fa: True<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0cstr1<\/code> \u548c str2<\/code> \u56e0\u4e3a\u5927\u5c0f\u5199\u4e0d\u540c\uff0c==<\/code> \u8fd0\u7b97\u7ed3\u679c\u4e3a False<\/code>\u3002\u800c str1<\/code> \u548c str3<\/code> \u56e0\u4e3a\u5b8c\u5168\u76f8\u540c\uff0c==<\/code> \u8fd0\u7b97\u7ed3\u679c\u4e3a True<\/code>\u3002<\/p>\n<\/p>\n
2. ><\/code>\u3001<<\/code>\u3001>=<\/code>\u3001<=<\/code><\/h4>\n<\/p>\n
\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u5b57\u5178\u5e8f\u3002\u5b57\u5178\u5e8f\u57fa\u4e8e\u5b57\u7b26\u7684Unicode\u7801\u70b9\u987a\u5e8f\u3002<\/p>\n<\/p>\n
str1 = "apple"<\/p>\n
str2 = "banana"<\/p>\n
str3 = "Apple"<\/p>\n
print(str1 > str2)   # \u8f93\u51fa: False<\/p>\n
print(str1 < str2)   # \u8f93\u51fa: True<\/p>\n
print(str1 >= str3)  # \u8f93\u51fa: True<\/p>\n
print(str1 <= str3)  # \u8f93\u51fa: False<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0cstr1<\/code> \u6bd4 str2<\/code> \u7684\u5b57\u5178\u5e8f\u5c0f\uff0c\u56e0\u6b64 str1 < str2<\/code> \u4e3a True<\/code>\u3002\u7531\u4e8e\u5c0f\u5199\u5b57\u6bcd\u7684Unicode\u7801\u70b9\u6bd4\u5927\u5199\u5b57\u6bcd\u5927\uff0c\u6240\u4ee5 str1 >= str3<\/code> \u4e3a True<\/code>\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5ffd\u7565\u5927\u5c0f\u5199\u6bd4\u8f83<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5e0c\u671b\u6bd4\u8f83\u5b57\u7b26\u4e32\u65f6\u5ffd\u7565\u5927\u5c0f\u5199\u3002\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u540c\u4e00\u5927\u5c0f\u5199\uff08\u5982\u5168\u5c0f\u5199\u6216\u5168\u5927\u5199\uff09\u518d\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<\/p>\n
str1 = "apple"<\/p>\n
str2 = "Apple"<\/p>\n
str3 = "APPLE"<\/p>\n
print(str1.lower() == str2.lower())  # \u8f93\u51fa: True<\/p>\n
print(str1.upper() == str3.upper())  # \u8f93\u51fa: True<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8c03\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5 lower()<\/code> \u6216 upper()<\/code> \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u540c\u4e00\u5927\u5c0f\u5199\uff0c\u518d\u8fdb\u884c\u6bd4\u8f83\uff0c\u80fd\u591f\u5ffd\u7565\u5927\u5c0f\u5199\u7684\u5dee\u5f02\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u6bd4\u8f83<\/h3>\n<\/p>\n
Python3 \u63d0\u4f9b\u4e86\u5185\u7f6e\u51fd\u6570 cmp_to_key<\/code>\uff0c\u53ef\u4ee5\u7528\u4e8e\u81ea\u5b9a\u4e49\u6392\u5e8f\u89c4\u5219\u7684\u5b57\u7b26\u4e32\u6bd4\u8f83\u3002cmp_to_key<\/code> \u5728 functools<\/code> \u6a21\u5757\u4e2d\u3002<\/p>\n<\/p>\n
from functools import cmp_to_key<\/p>\n
def compare_str(str1, str2):<\/p>\n
    if str1.lower() < str2.lower():<\/p>\n
        return -1<\/p>\n
    elif str1.lower() > str2.lower():<\/p>\n
        return 1<\/p>\n
    else:<\/p>\n
        return 0<\/p>\n
str_list = ["apple", "Banana", "orange", "Apple"]<\/p>\n
sorted_list = sorted(str_list, key=cmp_to_key(compare_str))<\/p>\n
print(sorted_list)  # \u8f93\u51fa: ['apple', 'Apple', 'Banana', 'orange']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0ccompare_str<\/code> \u51fd\u6570\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\uff0csorted<\/code> \u51fd\u6570\u901a\u8fc7 cmp_to_key<\/code> \u5c06\u81ea\u5b9a\u4e49\u6bd4\u8f83\u89c4\u5219\u5e94\u7528\u4e8e\u6392\u5e8f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5bf9\u6bd4\u5b57\u7b26\u4e32\u957f\u5ea6<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u6bd4\u8f83\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u6765\u5224\u65ad\u5176\u5173\u7cfb\u3002len()<\/code> \u51fd\u6570\u53ef\u4ee5\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n<\/p>\n
str1 = "apple"<\/p>\n
str2 = "banana"<\/p>\n
if len(str1) > len(str2):<\/p>\n
    print(f"{str1} is longer than {str2}")<\/p>\n
elif len(str1) < len(str2):<\/p>\n
    print(f"{str1} is shorter than {str2}")<\/p>\n
else:<\/p>\n
    print(f"{str1} and {str2} are of the same length")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c\u901a\u8fc7\u6bd4\u8f83 str1<\/code> \u548c str2<\/code> \u7684\u957f\u5ea6\uff0c\u5224\u65ad\u5176\u5173\u7cfb\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6bd4\u8f83<\/h3>\n<\/p>\n
\u5728\u4e00\u4e9b\u9ad8\u7ea7\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u53ef\u4ee5\u7528\u4e8e\u590d\u6742\u7684\u5b57\u7b26\u4e32\u6bd4\u8f83\u548c\u5339\u914d\u3002re<\/code> \u6a21\u5757\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u529f\u80fd\u3002<\/p>\n<\/p>\n
import re<\/p>\n
pattern = r"apple"<\/p>\n
str1 = "I have an apple"<\/p>\n
str2 = "I have a banana"<\/p>\n
if re.search(pattern, str1):<\/p>\n
    print(f"The pattern '{pattern}' is found in '{str1}'")<\/p>\n
else:<\/p>\n
    print(f"The pattern '{pattern}' is not found in '{str1}'")<\/p>\n
if re.search(pattern, str2):<\/p>\n
    print(f"The pattern '{pattern}' is found in '{str2}'")<\/p>\n
else:<\/p>\n
    print(f"The pattern '{pattern}' is not found in '{str2}'")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c\u901a\u8fc7 re.search<\/code> \u51fd\u6570\u67e5\u627e\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5305\u542b\u7279\u5b9a\u6a21\u5f0f\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python3\u4e2d\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f83\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\u3002\u4f7f\u7528\u5173\u7cfb\u8fd0\u7b97\u7b26\u662f\u6700\u76f4\u63a5\u548c\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u9002\u5408\u5927\u591a\u6570\u7b80\u5355\u6bd4\u8f83\u573a\u666f\u3002\u5bf9\u4e8e\u5ffd\u7565\u5927\u5c0f\u5199\u7684\u6bd4\u8f83\uff0c\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u540c\u4e00\u5927\u5c0f\u5199\u3002\u5185\u7f6e\u51fd\u6570 cmp_to_key<\/code> \u53ef\u4ee5\u7528\u4e8e\u81ea\u5b9a\u4e49\u6bd4\u8f83\u89c4\u5219\u3002\u5bf9\u4e8e\u7279\u6b8a\u573a\u666f\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u590d\u6742\u7684\u5b57\u7b26\u4e32\u5339\u914d\u548c\u6bd4\u8f83\u3002\u901a\u8fc7\u5408\u7406\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6ee1\u8db3\u4e0d\u540c\u5e94\u7528\u573a\u666f\u7684\u9700\u6c42\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5728Python3\u4e2d\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f83\u7684\u57fa\u672c\u89c4\u5219\u662f\u4ec0\u4e48\uff1f<\/strong>
\u5728Python3\u4e2d\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f83\u662f\u57fa\u4e8e\u5b57\u5178\u5e8f\uff08lexicographical order\uff09\u8fdb\u884c\u7684\u3002\u6bd4\u8f83\u65f6\uff0cPython\u4f1a\u9010\u4e2a\u5b57\u7b26\u8fdb\u884c\u6bd4\u8f83\uff0c\u76f4\u5230\u627e\u5230\u4e0d\u540c\u7684\u5b57\u7b26\u4e3a\u6b62\u3002\u5982\u679c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5728\u5b57\u5178\u5e8f\u4e2d\u4f4d\u4e8e\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e4b\u524d\uff0c\u5219\u8fd4\u56deTrue\u3002\u6bd4\u8f83\u65f6\uff0c\u5b57\u7b26\u7684ASCII\u503c\u88ab\u7528\u4e8e\u786e\u5b9a\u987a\u5e8f\uff0c\u56e0\u6b64\u5927\u5199\u5b57\u6bcd\u4f1a\u5728\u5c0f\u5199\u5b57\u6bcd\u4e4b\u524d\u3002<\/p>\n
\u5982\u4f55\u4f7f\u7528Python3\u4e2d\u7684\u5185\u7f6e\u51fd\u6570\u6765\u6bd4\u8f83\u5b57\u7b26\u4e32\uff1f<\/strong>
Python3\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u5f0f\u6765\u6bd4\u8f83\u5b57\u7b26\u4e32\u3002\u6700\u5e38\u7528\u7684\u65b9\u5f0f\u5305\u62ec\u4f7f\u7528\u8fd0\u7b97\u7b26\uff08\u5982==<\/code>, !=<\/code>, <<\/code>, ><\/code>, <=<\/code>, >=<\/code>\uff09\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528str.compare()<\/code>\u7b49\u65b9\u6cd5\u6765\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u6bd4\u8f83\u3002\u4f7f\u7528\u8fd0\u7b97\u7b26\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u6bd4\u8f83\uff0c\u8fd4\u56de\u5e03\u5c14\u503c\uff0c\u6307\u793a\u6bd4\u8f83\u7ed3\u679c\u3002<\/p>\n
\u5728\u8fdb\u884c\u5b57\u7b26\u4e32\u6bd4\u8f83\u65f6\uff0c\u662f\u5426\u533a\u5206\u5927\u5c0f\u5199\uff1f<\/strong>
\u662f\u7684\uff0c\u5728Python3\u4e2d\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f83\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\u3002\u4f8b\u5982\uff0c"abc"<\/code>\u4e0e"ABC"<\/code>\u7684\u6bd4\u8f83\u7ed3\u679c\u4e3aFalse<\/code>\uff0c\u56e0\u4e3a\u5c0f\u5199\u5b57\u6bcd\u7684ASCII\u503c\u4f4e\u4e8e\u5bf9\u5e94\u7684\u5927\u5199\u5b57\u6bcd\u3002\u5982\u679c\u9700\u8981\u8fdb\u884c\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u6bd4\u8f83\uff0c\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u90fd\u8f6c\u6362\u4e3a\u540c\u4e00\u5927\u5c0f\u5199\u683c\u5f0f\uff08\u4f7f\u7528str.lower()<\/code>\u6216str.upper()<\/code>\uff09\u540e\u518d\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python3\u4e2d\u5b57\u7b26\u4e32\u6bd4\u8f83\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528\u5173\u7cfb\u8fd0\u7b97\u7b26\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u5ffd\u7565\u5927\u5c0f\u5199\u6bd4\u8f83\u3001\u5bf9\u6bd4\u5b57\u7b26\u4e32\u957f\u5ea6\u3001\u4f7f\u7528\u6b63\u5219\u8868 […]","protected":false},"author":3,"featured_media":1104510,"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\/1104504"}],"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=1104504"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1104504\/revisions"}],"predecessor-version":[{"id":1104515,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1104504\/revisions\/1104515"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1104510"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1104504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1104504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1104504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}