{"id":2732,"date":"2025-03-14T22:17:21","date_gmt":"2025-03-14T14:17:21","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2732"},"modified":"2025-03-14T22:17:21","modified_gmt":"2025-03-14T14:17:21","slug":"python-3-%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/14\/python-3-%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%af%a6%e8%a7%a3\/","title":{"rendered":"Python 3 \u5b57\u7b26\u4e32\u8be6\u89e3"},"content":{"rendered":"\n

Python 3 \u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684<\/strong>\uff08\u5373\u5b57\u7b26\u4e32\u5185\u5bb9\u4e0d\u80fd\u4fee\u6539\uff09\uff0c\u5e76\u4e14\u652f\u6301\u591a\u79cd\u64cd\u4f5c<\/strong>\uff0c\u5982\u7d22\u5f15\u3001\u5207\u7247\u3001\u683c\u5f0f\u5316\u3001\u5185\u7f6e\u65b9\u6cd5\u7b49\u3002\u5b57\u7b26\u4e32\u5728 Python \u4e2d\u5c5e\u4e8e str<\/code><\/strong> \u7c7b\u578b\u3002<\/p>\n\n\n\n

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1. \u5b57\u7b26\u4e32\u7684\u5b9a\u4e49<\/strong><\/h2>\n\n\n\n

\u5728 Python 3 \u4e2d\uff0c\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528\u5355\u5f15\u53f7 '<\/code>\u3001\u53cc\u5f15\u53f7 \"<\/code> \u6216\u4e09\u5f15\u53f7 ''' \"\"\"<\/code><\/strong> \u8868\u793a\u3002<\/p>\n\n\n\n

\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n

str1 = 'Hello'\nstr2 = \"Python\"\nstr3 = '''This is\na multi-line\nstring'''\nprint(str1, str2, str3)<\/code><\/pre>\n\n\n\n
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2. \u8bbf\u95ee\u5b57\u7b26\u4e32<\/strong><\/h2>\n\n\n\n
Python \u652f\u6301\u7d22\u5f15\uff08Indexing\uff09\u548c\u5207\u7247\uff08Slicing\uff09<\/strong> \u6765\u8bbf\u95ee\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u3002<\/p>\n\n\n\n
\uff081\uff09\u7d22\u5f15<\/strong><\/h3>\n\n\n\n
\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\uff08\u4ece 0<\/strong> \u5f00\u59cb\uff09\u8bbf\u95ee\uff0c\u8d1f\u6570\u7d22\u5f15\u4ece -1<\/strong> \u5f00\u59cb\u3002<\/p>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
s = \"Python\"\nprint(s[0])   # P\nprint(s[-1])  # n\nprint(s[2])   # t<\/code><\/pre>\n\n\n\n
\uff082\uff09\u5207\u7247<\/strong><\/h3>\n\n\n\n
\u5207\u7247\u7528\u4e8e\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\uff0c\u8bed\u6cd5\uff1astring[start:end:step]<\/code><\/p>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
s = \"Hello, Python\"\nprint(s[0:5])    # Hello\nprint(s[:5])     # Hello\uff08\u9ed8\u8ba4\u4ece 0 \u5f00\u59cb\uff09\nprint(s[7:])     # Python\uff08\u9ed8\u8ba4\u5230\u672b\u5c3e\uff09\nprint(s[::2])    # Hlo yhn\uff08\u6b65\u957f\u4e3a2\uff09\nprint(s[::-1])   # \u53cd\u8f6c\u5b57\u7b26\u4e32<\/code><\/pre>\n\n\n\n
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3. \u5b57\u7b26\u4e32\u62fc\u63a5\u4e0e\u91cd\u590d<\/strong><\/h2>\n\n\n\n
Python \u5141\u8bb8\u4f7f\u7528 +<\/code>\uff08\u62fc\u63a5\uff09<\/strong> \u548c *<\/code>\uff08\u91cd\u590d\uff09<\/strong> \u64cd\u4f5c\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
str1 = \"Hello\"\nstr2 = \"Python\"\nprint(str1 + \" \" + str2)  # Hello Python\nprint(str1 * 3)           # HelloHelloHello<\/code><\/pre>\n\n\n\n
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4. \u5e38\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5<\/strong><\/h2>\n\n\n\n
Python \u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5b57\u7b26\u4e32\u65b9\u6cd5\uff0c\u4ee5\u4e0b\u662f\u5e38\u7528\u7684\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
\u65b9\u6cd5<\/th>\u8bf4\u660e<\/th>\u793a\u4f8b<\/th><\/tr><\/thead>
len(s)<\/code><\/td>\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6<\/td>len(\"Python\") \u2192 6<\/code><\/td><\/tr>
s.lower()<\/code><\/td>\u8f6c\u5c0f\u5199<\/td>\"HELLO\".lower() \u2192 \"hello\"<\/code><\/td><\/tr>
s.upper()<\/code><\/td>\u8f6c\u5927\u5199<\/td>\"hello\".upper() \u2192 \"HELLO\"<\/code><\/td><\/tr>
s.strip()<\/code><\/td>\u53bb\u9664\u4e24\u7aef\u7a7a\u683c<\/td>\" Python \".strip() \u2192 \"Python\"<\/code><\/td><\/tr>
s.lstrip()<\/code><\/td>\u53bb\u9664\u5de6\u4fa7\u7a7a\u683c<\/td>\" Python\".lstrip() \u2192 \"Python\"<\/code><\/td><\/tr>
s.rstrip()<\/code><\/td>\u53bb\u9664\u53f3\u4fa7\u7a7a\u683c<\/td>\"Python \".rstrip() \u2192 \"Python\"<\/code><\/td><\/tr>
s.replace(old, new)<\/code><\/td>\u66ff\u6362\u5b57\u7b26\u4e32<\/td>\"Hello\".replace(\"H\", \"J\") \u2192 \"Jello\"<\/code><\/td><\/tr>
s.split(delim)<\/code><\/td>\u62c6\u5206\u5b57\u7b26\u4e32<\/td>\"a,b,c\".split(\",\") \u2192 ['a', 'b', 'c']<\/code><\/td><\/tr>
s.join(iterable)<\/code><\/td>\u8fde\u63a5\u5b57\u7b26\u4e32<\/td>\" \".join(['a', 'b', 'c']) \u2192 \"a b c\"<\/code><\/td><\/tr>
s.startswith(sub)<\/code><\/td>\u662f\u5426\u4ee5 sub<\/code> \u5f00\u5934<\/td>\"Python\".startswith(\"Py\") \u2192 True<\/code><\/td><\/tr>
s.endswith(sub)<\/code><\/td>\u662f\u5426\u4ee5 sub<\/code> \u7ed3\u5c3e<\/td>\"Python\".endswith(\"on\") \u2192 True<\/code><\/td><\/tr>
s.find(sub)<\/code><\/td>\u67e5\u627e sub<\/code>\uff0c\u8fd4\u56de\u7d22\u5f15<\/td>\"hello\".find(\"l\") \u2192 2<\/code><\/td><\/tr>
s.count(sub)<\/code><\/td>\u7edf\u8ba1 sub<\/code> \u51fa\u73b0\u6b21\u6570<\/td>\"banana\".count(\"a\") \u2192 3<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
s = \"  Hello, Python!  \"\nprint(s.strip())       # \"Hello, Python!\"\nprint(s.lower())       # \"  hello, python!  \"\nprint(s.replace(\"Hello\", \"Hi\"))  # \"  Hi, Python!  \"\nprint(s.split(\",\"))    # ['  Hello', ' Python!  ']\nprint(\"-\".join([\"Hello\", \"Python\"]))  # \"Hello-Python\"<\/code><\/pre>\n\n\n\n
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5. \u5b57\u7b26\u4e32\u683c\u5f0f\u5316<\/strong><\/h2>\n\n\n\n
Python \u63d0\u4f9b\u4e86 \u4e09\u79cd\u5b57\u7b26\u4e32\u683c\u5f0f\u5316<\/strong> \u65b9\u5f0f\uff1a<\/p>\n\n\n\n
\uff081\uff09%<\/code> \u683c\u5f0f\u5316<\/strong><\/h3>\n\n\n\n
\u7c7b\u4f3c\u4e8e C \u8bed\u8a00\u98ce\u683c\uff1a<\/p>\n\n\n\n
name = \"Alice\"\nage = 25\nprint(\"My name is %s and I am %d years old.\" % (name, age))\n# My name is Alice and I am 25 years old.<\/code><\/pre>\n\n\n\n
\uff082\uff09format()<\/code> \u65b9\u6cd5<\/strong><\/h3>\n\n\n\n
print(\"My name is {} and I am {} years old.\".format(name, age))\n# My name is Alice and I am 25 years old.\n\nprint(\"My name is {0} and I am {1} years old.\".format(name, age))\n# My name is Alice and I am 25 years old.<\/code><\/pre>\n\n\n\n
\uff083\uff09f-strings\uff08Python 3.6+ \u63a8\u8350\uff09<\/strong><\/h3>\n\n\n\n
print(f\"My name is {name} and I am {age} years old.\")\n# My name is Alice and I am 25 years old.<\/code><\/pre>\n\n\n\n
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6. \u5224\u65ad\u5b57\u7b26\u4e32<\/strong><\/h2>\n\n\n\n
Python \u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u7684\u7279\u6027\uff1a<\/p>\n\n\n\n
\u65b9\u6cd5<\/th>\u8bf4\u660e<\/th>\u793a\u4f8b<\/th><\/tr><\/thead>
s.isalpha()<\/code><\/td>\u662f\u5426\u5168\u662f\u5b57\u6bcd<\/td>\"abc\".isalpha() \u2192 True<\/code><\/td><\/tr>
s.isdigit()<\/code><\/td>\u662f\u5426\u5168\u662f\u6570\u5b57<\/td>\"123\".isdigit() \u2192 True<\/code><\/td><\/tr>
s.isalnum()<\/code><\/td>\u662f\u5426\u5168\u662f\u5b57\u6bcd\u6216\u6570\u5b57<\/td>\"abc123\".isalnum() \u2192 True<\/code><\/td><\/tr>
s.isspace()<\/code><\/td>\u662f\u5426\u5168\u662f\u7a7a\u767d\u5b57\u7b26<\/td>\" \".isspace() \u2192 True<\/code><\/td><\/tr>
s.istitle()<\/code><\/td>\u662f\u5426\u662f\u6807\u9898\u683c\u5f0f<\/td>\"Hello World\".istitle() \u2192 True<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
s = \"Python3\"\nprint(s.isalpha())   # False (\u5305\u542b\u6570\u5b57)\nprint(s.isdigit())   # False (\u5305\u542b\u5b57\u6bcd)\nprint(\"123\".isdigit())  # True\nprint(\"Hello World\".istitle())  # True<\/code><\/pre>\n\n\n\n
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7. \u8f6c\u4e49\u5b57\u7b26<\/strong><\/h2>\n\n\n\n
Python \u4f7f\u7528 \\<\/code>\uff08\u53cd\u659c\u6760\uff09<\/strong> \u8fdb\u884c\u8f6c\u4e49\uff1a<\/p>\n\n\n\n
\u8f6c\u4e49\u5b57\u7b26<\/th>\u8bf4\u660e<\/th><\/tr><\/thead>
\\n<\/code><\/td>\u6362\u884c<\/td><\/tr>
\\t<\/code><\/td>\u5236\u8868\u7b26<\/td><\/tr>
\\'<\/code><\/td>\u5355\u5f15\u53f7<\/td><\/tr>
\\\"<\/code><\/td>\u53cc\u5f15\u53f7<\/td><\/tr>
\\\\<\/code><\/td>\u53cd\u659c\u6760<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
print(\"Hello\\nPython\")  # \u6362\u884c\nprint(\"Hello\\tPython\")  # \u5236\u8868\u7b26\nprint(\"I\\'m learning Python\")  # \u8f6c\u4e49\u5355\u5f15\u53f7<\/code><\/pre>\n\n\n\n
\n\n\n\n
8. \u539f\u59cb\u5b57\u7b26\u4e32\uff08r”\u2026”\uff09<\/strong><\/h2>\n\n\n\n
\u5982\u679c\u4f60\u4e0d\u60f3\u8ba9 \\<\/code> \u88ab\u8f6c\u4e49\uff0c\u53ef\u4ee5\u4f7f\u7528 \u539f\u59cb\u5b57\u7b26\u4e32<\/strong>\uff08\u5728\u5b57\u7b26\u4e32\u524d\u52a0 r<\/code>\uff09\u3002<\/p>\n\n\n\n
\ud83d\udccc \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n
print(r\"C:\\Users\\Python\")  # C:\\Users\\Python<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u603b\u7ed3<\/strong><\/h2>\n\n\n\n
    \n
  • \u5b57\u7b26\u4e32\u7d22\u5f15<\/strong>\uff08\u4ece 0<\/code> \u5f00\u59cb\uff09\u548c \u5207\u7247<\/strong>\uff08s[start:end:step]<\/code>\uff09<\/li>\n\n\n\n
  • \u5b57\u7b26\u4e32\u4e0d\u53ef\u53d8<\/strong><\/li>\n\n\n\n
  • \u5b57\u7b26\u4e32\u62fc\u63a5\uff08+<\/code>\uff09\u548c\u91cd\u590d\uff08*<\/code>\uff09<\/strong><\/li>\n\n\n\n
  • \u5b57\u7b26\u4e32\u65b9\u6cd5<\/strong>\uff08strip()<\/code>\u3001replace()<\/code>\u3001split()<\/code>\u3001join()<\/code> \u7b49\uff09<\/li>\n\n\n\n
  • \u4e09\u79cd\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u5f0f<\/strong>\uff08%<\/code>\u3001format()<\/code>\u3001f-strings<\/code>\uff09<\/li>\n\n\n\n
  • \u5224\u65ad\u5b57\u7b26\u4e32\u7279\u6027\u7684\u65b9\u6cd5<\/strong>\uff08isdigit()<\/code>\u3001isalpha()<\/code>\u3001isspace()<\/code> \u7b49\uff09<\/li>\n\n\n\n
  • \u8f6c\u4e49\u5b57\u7b26<\/strong>\uff08\\n<\/code>\u3001\\t<\/code> \u7b49\uff09\u548c \u539f\u59cb\u5b57\u7b26\u4e32\uff08r\"...\"<\/code>\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n
     \u4f60\u53ef\u4ee5\u5c1d\u8bd5\u8fd9\u4e9b\u4ee3\u7801\uff0c\u5728 Python \u7ec8\u7aef\u8fd0\u884c\u5e76\u4f53\u9a8c\u5b57\u7b26\u4e32\u7684\u5f3a\u5927\u529f\u80fd\uff01<\/strong>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Python 3 \u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff08\u5373\u5b57\u7b26\u4e32\u5185\u5bb9\u4e0d\u80fd\u4fee\u6539\uff09\uff0c\u5e76\u4e14\u652f\u6301\u591a\u79cd\u64cd\u4f5c\uff0c\u5982\u7d22\u5f15\u3001\u5207\u7247\u3001\u683c\u5f0f\u5316\u3001\u5185\u7f6e\u65b9 […]<\/p>\n","protected":false},"author":1,"featured_media":2733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"class_list":["post-2732","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python-3-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2732","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2732"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2732\/revisions"}],"predecessor-version":[{"id":2734,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2732\/revisions\/2734"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/2733"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2732"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2732"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2732"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}