<\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528join()<\/code>\u800c\u975e+<\/code>\u6216+=<\/code>\u3002<\/p>\n\n\n\n# \u4f7f\u7528join\u62fc\u63a5\u5217\u8868\u4e2d\u7684\u5b57\u7b26\u4e32<\/em>
strings = [\"Hello\", \"World\"]
result = \" \".join(strings)
print(result) # \u8f93\u51fa: Hello World<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : join()<\/code>\u65b9\u6cd5\u66f4\u9002\u7528\u4e8e\u5927\u91cf\u5b57\u7b26\u4e32\u62fc\u63a5\uff0c\u6027\u80fd\u4f18\u4e8e\u591a\u6b21\u4f7f\u7528+<\/code>\u6216+=<\/code>\u3002<\/p>\n\n\n\n<\/span>2. \u5feb\u901f\u8ba1\u6570\u5b57\u7b26<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528count()<\/code>\u65b9\u6cd5\u3002<\/p>\n\n\n\ntext = \"hello world\"
char_count = text.count(\"l\")
print(char_count) # \u8f93\u51fa: 3<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : count()<\/code>\u8f7b\u677e\u7edf\u8ba1\u7279\u5b9a\u5b57\u7b26\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n\n\n\n<\/span>3. \u5206\u5272\u5b57\u7b26\u4e32<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528split()<\/code>\u3002<\/p>\n\n\n\nline = \"name:John age:30\"
pairs = line.split(\" \")
name, age = pairs[0].split(\":\")[1], pairs[1].split(\":\")[1]
print(name, age) # \u8f93\u51fa: John 30<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : split()<\/code>\u6839\u636e\u5206\u9694\u7b26\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u6210\u5217\u8868\uff0c\u7075\u6d3b\u8fd0\u7528\u53ef\u4ee5\u9ad8\u6548\u89e3\u6790\u6570\u636e\u3002<\/p>\n\n\n\n<\/span>4. \u5207\u7247\u64cd\u4f5c<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u5229\u7528\u5207\u7247\u5feb\u901f\u63d0\u53d6\u5b50\u4e32\u3002<\/p>\n\n\n\ns = \"Python\"
slice_s = s[0:2] # \u524d\u4e24\u4e2a\u5b57\u7b26<\/em>
reverse_s = s[::-1] # \u53cd\u8f6c\u5b57\u7b26\u4e32<\/em>
print(slice_s, reverse_s) # \u8f93\u51fa: Py ynohP<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u5207\u7247 [start:end:step]<\/code> \u662f\u63d0\u53d6\u5b57\u7b26\u4e32\u5b50\u4e32\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u8d1f\u6570\u7d22\u5f15\u7528\u4e8e\u4ece\u5b57\u7b26\u4e32\u672b\u5c3e\u5f00\u59cb\u8ba1\u6570\u3002<\/p>\n\n\n\n<\/span>5. \u67e5\u627e\u5b50\u4e32<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528find()<\/code>\u6216index()<\/code>\u3002<\/p>\n\n\n\ntext = \"Hello, welcome to Python.\"
pos = text.find(\"welcome\")
print(pos) # \u8f93\u51fa: 7<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : find()<\/code>\u8fd4\u56de\u5b50\u4e32\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u672a\u627e\u5230\u5219\u8fd4\u56de-1\uff1bindex()<\/code>\u7c7b\u4f3c\uff0c\u4f46\u672a\u627e\u5230\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n\n\n\n<\/span>6. \u5927\u5c0f\u5199\u8f6c\u6362<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528upper()<\/code>, lower()<\/code>, capitalize()<\/code>\u7b49\u65b9\u6cd5\u3002<\/p>\n\n\n\ntext = \"hello WORLD\"
print(text.upper()) # \u8f93\u51fa: HELLO WORLD<\/em>
print(text.lower()) # \u8f93\u51fa: hello world<\/em>
print(text.capitalize()) # \u8f93\u51fa: Hello world<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u8fd9\u4e9b\u65b9\u6cd5\u5728\u5904\u7406\u6587\u672c\u683c\u5f0f\u65f6\u975e\u5e38\u6709\u7528\uff0c\u5982\u6807\u9898\u5316\u3001\u5168\u5927\u5199\u6216\u5168\u5c0f\u5199\u8f6c\u6362\u3002<\/p>\n\n\n\n<\/span>7. \u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7a7a\u683c<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528strip()<\/code>, rstrip()<\/code>, lstrip()<\/code>\u3002<\/p>\n\n\n\ns = \" Hello World! \"
print(s.strip()) # \u8f93\u51fa: Hello World!<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : strip()<\/code>\u79fb\u9664\u5b57\u7b26\u4e32\u9996\u5c3e\u7684\u7a7a\u767d\u5b57\u7b26\uff08\u5305\u62ec\u7a7a\u683c\u3001\u6362\u884c\u7b26\u7b49\uff09\uff0crstrip()<\/code>\u548clstrip()<\/code>\u5206\u522b\u4ec5\u79fb\u9664\u53f3\u4fa7\u548c\u5de6\u4fa7\u7684\u7a7a\u767d\u5b57\u7b26\u3002<\/p>\n\n\n\n<\/span>8. \u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528f-string\uff08Python 3.6+\uff09\u3002<\/p>\n\n\n\nname = \"Alice\"
age = 30
formatted = f\"My name is {name} and I am {age} years old.\"
print(formatted) # \u8f93\u51fa: My name is Alice and I am 30 years old.<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : f-string\u63d0\u4f9b\u4e86\u7b80\u6d01\u3001\u76f4\u89c2\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u5f0f\uff0c\u76f4\u63a5\u5728\u5b57\u7b26\u4e32\u4e2d\u5d4c\u5165\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<\/span>9. \u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u5904\u7406\u5b57\u7b26\u4e32<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5217\u8868\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n\n\n\ns = \"hello\"
upper_list = [c.upper() for c in s]
print(''.join(upper_list)) # \u8f93\u51fa: HELLO<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408join()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5b57\u7b26\u4e32\u5b57\u7b26\u7684\u6279\u91cf\u64cd\u4f5c\u3002<\/p>\n\n\n\n<\/span>10. \u66ff\u6362\u5b57\u7b26\u4e32<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528replace()<\/code>\u3002<\/p>\n\n\n\ntext = \"hello, hello, world!\"
new_text = text.replace(\"hello\", \"hi\", 2) # \u66ff\u6362\u524d\u4e24\u4e2a\"hello\"<\/em>
print(new_text) # \u8f93\u51fa: hi, hi, world!<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : replace()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u6307\u5b9a\u90e8\u5206\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u9650\u5236\u66ff\u6362\u6b21\u6570\u3002<\/p>\n\n\n\n<\/span>11. \u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528len()<\/code>\u51fd\u6570\u3002<\/p>\n\n\n\ns = \"Python\"
length = len(s)
print(length) # \u8f93\u51fa: 6<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u7b80\u5355\u4f46\u91cd\u8981\uff0clen()<\/code>\u51fd\u6570\u8fd4\u56de\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/p>\n\n\n\n<\/span>12. \u68c0\u67e5\u5b57\u7b26\u4e32\u5f00\u5934\u6216\u7ed3\u5c3e<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u4f7f\u7528startswith()<\/code>, endswith()<\/code>\u3002<\/p>\n\n\n\nfilename = \"example.txt\"
if filename.endswith(\".txt\"):
print(\"It's a text file.\")<\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u8fd9\u4e24\u4e2a\u65b9\u6cd5\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u4ee5\u7279\u5b9a\u524d\u7f00\u6216\u540e\u7f00\u5f00\u59cb\u6216\u7ed3\u675f\u3002<\/p>\n\n\n\n<\/span>13. \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u5f15\u5165re<\/code>\u6a21\u5757\u8fdb\u884c\u590d\u6742\u6a21\u5f0f\u5339\u914d\u3002<\/p>\n\n\n\nimport re
text = \"My email is example@example.com\"
email = re.search(r'\\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Z|a-z]{2,}\\b', text)
if email:
print(email.group()) # \u8f93\u51fa: example@example.com<\/em><\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5f3a\u5927\u7684\u6587\u672c\u5904\u7406\u5de5\u5177\uff0c\u9002\u7528\u4e8e\u590d\u6742\u7684\u5b57\u7b26\u4e32\u5339\u914d\u548c\u63d0\u53d6\u3002<\/p>\n\n\n\n<\/span>14. \u904d\u5386\u5b57\u7b26\u4e32<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u76f4\u63a5\u904d\u5386\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\ns = \"Python\"
for char in s:
print(char)<\/code><\/pre>\n\n\n\n\u89e3\u91ca<\/strong> : \u5b57\u7b26\u4e32\u672c\u8eab\u5c31\u662f\u5e8f\u5217\uff0c\u53ef\u4ee5\u76f4\u63a5\u904d\u5386\uff0c\u9002\u5408\u5b57\u7b26\u7ea7\u64cd\u4f5c\u3002<\/p>\n\n\n\n<\/span>15. \u5b57\u7b26\u4e32\u4e0d\u53d8\u6027<\/strong><\/span><\/h2>\n\n\n\n\u6280\u5de7<\/strong> : \u6ce8\u610f\u5b57\u7b26\u4e32\u7684\u4e0d\u53ef\u53d8\u6027\u3002<\/p>\n\n\n\ns = \"Python\"