{"id":205,"date":"2023-02-22T22:22:15","date_gmt":"2023-02-22T14:22:15","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=205"},"modified":"2023-04-30T15:29:06","modified_gmt":"2023-04-30T07:29:06","slug":"python-string-operations","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/02\/22\/python-string-operations\/","title":{"rendered":"Python\u5b57\u7b26\u4e32\u64cd\u4f5c"},"content":{"rendered":"

\u5b57\u7b26\u4e32\u5b57\u9762\u91cf<\/h2>\n

\u53cc\u5f15\u53f7<\/h3>\n
>>> spam = "This is Tom' cat"\n>>> spam\n"This is Tom' cat"<\/code><\/pre>\n
<\/p>\n
\u8f6c\u4e49\u5b57\u7b26<\/h3>\n
>>> print('\\',\\",\\t,\\n,\\\\')\n',",    ,\n,\\<\/code><\/pre>\n
\u539f\u59cb\u5b57\u7b26\u4e32<\/h3>\n
\u5728\u5f15\u53f7\u4e4b\u524d\u52a0\u4e0ar\uff0c\u4f7f\u4ed6\u6210\u4e3a\u539f\u59cb\u5b57<\/p>\n
>>> print(r'That is Carol\\' cat')\nThat is Carol\\' cat<\/code><\/pre>\n
\u7528\u4e09\u91cd\u5f15\u53f7\u7684\u591a\u884c\u5b57\u7b26\u4e32<\/h3>\n
>>> print('''Dear Tom:\nThank for your help\nTjanks;\nLili''')\nDear Tom:\nThank for your help\nTjanks;\nLili<\/code><\/pre>\n
\u5b57\u7b26\u4e32\u4e0b\u6807\u548c\u5207\u7247<\/h3>\n
>>> spam = 'hello world!'\n>>> spam[0]\n'h'\n>>> spam[4]\n'o'\n>>> spam[-1]\n'!'\n>>> spam[0:5]\n'hello'\n>>> spam[:5]\n'hello'\n>>> spam[6:]\n'world!'<\/code><\/pre>\n
\u5b57\u7b26\u4e32\u4e2d\u7684in \u548cnot in \u64cd\u4f5c\u7b26<\/h3>\n
>>> 'hello' in 'hello word!'\nTrue<\/code><\/pre>\n
\u6709\u7528\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5<\/h2>\n
\u5b57\u7b26\u4e32\u65b9\u6cd5 upper(), lower(), isupper(), islower()<\/h3>\n
>>> spam = 'Hello word!'\n>>> spam.upper()  #\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199\n'HELLO WORD!'\n>>> spam = spam.lower()  #\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5c0f\u5199\n>>> spam\n'hello word!'\n>>> 'Hello'.islower()  #\u5224\u65ad\u5b57\u7b26\u4e32\u4e2d\u5b57\u7b26\u662f\u5426\u90fd\u4e3a\u5c0f\u5199\uff0c\u81ea\u52a8\u5ffd\u7565\u975e\u5b57\u6bcd\u7684\u90e8\u5206\nFalse\n>>> 'Hello'.isupper()  #\u5224\u65ad\u5b57\u7b26\u4e32\u4e2d\u5b57\u7b26\u662f\u5426\u5168\u4e3a\u5927\u5199\uff0c\u81ea\u52a8\u5ffd\u7565\u975e\u5b57\u6bcd\u7684\u90e8\u5206\nFalse<\/code><\/pre>\n
isX\u5b57\u7b26\u4e32\u65b9\u6cd5<\/h3>\n
    \n
  • isalpha() \u8fd4\u56deTure\uff0c\u5b57\u7b26\u4e32\u53ea\u5305\u542b\u5b57\u6bcd\uff0c\u5e76\u4e14\u975e\u7a7a<\/li>\n<\/ul>\n
    >>> 'hello'.isalpha()\nTrue\n>>> 'hello '.isalpha()\nFalse\n>>> 'hello1223'.isalpha()\nFalse<\/code><\/pre>\n
      \n
    • isalnum() \u8fd4\u56deTure\uff0c\u5b57\u7b26\u4e32\u53ea\u5305\u542b\u6570\u5b57\u548c\u5b57\u6bcd\uff0c\u5e76\u4e14\u975e\u7a7a<\/li>\n<\/ul>\n
      >>> 'hello'.isalnum()\nTrue\n>>> 'hello '.isalnum()\nFalse\n>>> 'h545'.isalnum()\nTrue<\/code><\/pre>\n
        \n
      • isdecimal() \u8fd4\u56deTrue\uff0c\u5b57\u7b26\u4e32\u53ea\u5305\u542b\u6570\u5b57\uff0c\u5e76\u4e14\u975e\u7a7a<\/li>\n<\/ul>\n
        >>> '123'.isdecimal()\nTrue\n>>> 'hello123'.isdecimal()\nFalse<\/code><\/pre>\n
          \n
        • isspace \u8fd4\u56deTrue\uff0c\u5b57\u7b26\u4e32\u53ea\u5305\u542b\u7a7a\u683c\u3001\u5236\u8868\u7b26\u3001\u6362\u884c\u5e76\u4e14\u975e\u7a7a<\/li>\n<\/ul>\n
          >>> ' '.isspace()\nTrue<\/code><\/pre>\n
            \n
          • istitle() \u8fd4\u56deTrue\uff0c\u5b57\u7b26\u4e32\u4ec5\u4ee5\u5927\u5199\u5b57\u6bcd\u5f00\u5934<\/li>\n<\/ul>\n
            >>> 'This Is Title Case'.istitle()\nTrue\n>>> 'This Is Title Case 123'.istitle()\nTrue\n>>> 'This Is not Title Case'.istitle()\nFalse\n>>> 'This Is NOT Title Case'.istitle()\nFalse<\/code><\/pre>\n
            \u5b57\u7b26\u4e32\u65b9\u6cd5 startswith() \u548c endswith()<\/h3>\n
            >>> 'hello word!'.startswith('Hello')\nFalse\n>>> 'hello word!'.startswith('hello')\nTrue\n>>> 'hello word!'.startswith('he')\nTrue\n>>> 'hello word!'.startswith('h')\nTrue\n>>> 'hello word!'.endswith('!')\nTrue\n>>> 'hello word!'.endswith('word!')\nTrue\n>>> 'hello word!'.endswith('d')\nFalse<\/code><\/pre>\n
            \u5b57\u7b26\u4e32\u65b9\u6cd5join() \u548csplit()<\/h3>\n
            >>> '--'.join(['cats','rats','bats'])  #\u7ec4\u5408\u5b57\u7b26\u4e32\n'cats--rats--bats'\n>>> 'My nmae is Simon'.split()  #\u62c6\u5206\u5b57\u7b26\u4e32\n['My', 'nmae', 'is', 'Simon']<\/code><\/pre>\n
            \u7528rjust()\u3001ljust()\u3001center() \u65b9\u6cd5\u5bf9\u9f50<\/h3>\n
            >>> 'Hello'.rjust(10)\n'     Hello'\n>>> 'Hello'.rjust(20)\n'               Hello'\n>>> 'Hello'.ljust(10)\n'Hello     '\n>>> 'Hello '.center(10)\n'  Hello   '\n>>> 'Hello'.center(5)\n'Hello'\n#\u5f53\u5b57\u7b26\u4e0d\u591f\u65f6\u624d\u4e0d\u586b\u5145\n>>> 'Hello'.center(4)\n'Hello'<\/code><\/pre>\n
            \u9ed8\u8ba4\u586b\u5145\u4e3a\u7a7a\u683c<\/p>\n
            >>> 'Hello'.rjust(20, '*')\n'***************Hello'\n>>> 'Hello'.ljust(10, '-')\n'Hello-----'\n>>> 'Hello'.center(10, '+')\n'++Hello+++'<\/code><\/pre>\n
            \u7528strip()\u3001rstrip()\u3001lstrip() \u5220\u9664\u7a7a\u767d\u5b57\u7b26<\/h3>\n
            >>> ' hello word '.strip()\n'hello word'\n>>> ' hello word'.lstrip()\n'hello word'\n>>> 'hello word '.rstrip()\n'hello word'<\/code><\/pre>\n
            strip() \u62ec\u53f7\u4e2d\u7684\u5b57\u6bcd\u987a\u5e8f\u4e0d\u5f71\u54cd\u7ed3\u679c<\/p>\n
            >>> spam = 'SpamSpamBaconSpamEggsSpamSpam'\n>>> spam.rsplit()\n['SpamSpamBaconSpamEggsSpamSpam']\n>>> spam.rstrip('Spam')\n'SpamSpamBaconSpamEggs'\n>>> spam = 'SpamSpamBaconSpamEggsSpamSpam'\n>>> spam.rstrip('mapS')\n'SpamSpamBaconSpamEggs'\n>>> spam = 'SpamSpamBaconSpamEggsSpamSpam'\n>>> spam.rstrip('mpaS')\n'SpamSpamBaconSpamEggs'\n>>> spam = 'SpamSpamBaconSpamEggsSpamSpam'\n>>> spam.strip('Spam')\n'BaconSpamEggs'<\/code><\/pre>\n
            \u7528pyperclip\u6a21\u5757\u62f7\u8d1d\u7c98\u8d34\u5b57\u7b26\u4e32<\/h3>\n
            pyperclip()\u6a21\u5757\u6709copy()\u3001paste() \u4e24\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u5411\u8ba1\u7b97\u673a\u7684\u526a\u8d34\u677f\u53d1\u9001\u6587\u672c\u3001\u6216\u8005\u4ece\u5b83\u63a5\u6536\u6587\u672c<\/p>\n
            >>> import pyperclip\n>>> pyperclip.copy('Hello')\n>>> pyperclip.paste()\n'Hello'<\/code><\/pre>\n
            \u5c0f\u9879\u76ee\uff1a\u53e3\u4ee4\u4fdd\u9669\u7bb1<\/h4>\n
            #! python3\n# pw.py - An insecure password locker program.\n\nPASSWORDS = {'email':'test@test.com',\n             'blog':'www.appblog.cn',\n             'luggage':'123456' }\nimport sys,pyperclip\nif len(sys.argv)<2:\n    print('Usage:python pw.py [account] - copy account password')\n    sys.exit()\n\naccount = sys.argv[1]  #\u8fd9\u91cc\u5e94\u8be5\u662faccount name\n\nif account in PASSWORDS:\n    pyperclip.copy(PASSWORDS[account])\n    print('Password for ' + account + ' is copied to clipboard.')\nelse:\n    print('There is no account named '+ account)<\/code><\/pre>\n
            \u5c0f\u9879\u76ee\uff1a\u5728Wiki\u6807\u8bb0\u4e2d\u6dfb\u52a0\u65e0\u5e8f\u5217\u8868<\/h4>\n
            #! python3\n# bulletPointAdder.py\n\nimport pyperclip\ntext = pyperclip.paste()\n\ntemp = text.split('\\n')\nfor i in range(len(temp)):\n    temp[i] = '* ' + temp[i]\n\ntext = '\\n'.join(temp)\npyperclip.copy(text)<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
            \u5b57\u7b26\u4e32\u5b57\u9762\u91cf \u53cc\u5f15\u53f7 >>> spam = "This is Tom' cat […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"class_list":["post-205","post","type-post","status-publish","format-standard","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/205","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=205"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/205\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=205"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=205"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}