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超全整理!Python 字符串常用函数大全,新手必看

  • 2026-06-30 20:15:36
超全整理!Python 字符串常用函数大全,新手必看
【写在前面】可以参看我的视频进行学习,喜欢的朋友可以,关注,点赞,分享。

Python 字符串是编程中最常用的数据类型,掌握它的内置函数,能大幅提升字符串处理效率!本篇整理了分类清晰、代码可直接运行的字符串常用函数,适合新手收藏学习,转发也方便查看~

一、字符串基础操作函数

1. 求字符串长度:len()

返回字符串的字符个数(中文、英文、符号都算1个字符)

s = "Hello Python"
print(len(s))  # 输出:12

2. 字符串拼接:+ / join()

  • 简单拼接用 +
  • 批量拼接用 join()(效率更高)
# 方法1:+ 号
s1 = "Hello"
s2 = "World"
print(s1 + " " + s2)  # 输出:Hello World

# 方法2:join() 拼接列表内所有字符串
lst = ["我""爱""Python"]
print("".join(lst))   # 输出:我爱Python
print("-".join(lst))  # 输出:我-爱-Python

3. 字符串重复:*

快速生成重复字符串

s = "666"
print(s * 3)  # 输出:666666

4. 字符串切片:[起始:结束:步长]

截取字符串指定部分,左闭右开(包含起始,不包含结束)

s = "ABCDEFG"
print(s[0:3])   # 输出:ABC(取索引0-2)
print(s[::2])   # 输出:ACEG(步长为2,全量截取)
print(s[::-1])  # 输出:GFEDCBA(字符串反转)

二、字符串大小写转换函数

1. 全部大写:upper()

2. 全部小写:lower()

3. 首字母大写:capitalize()

4. 每个单词首字母大写:title()

5. 大小写互换:swapcase()

s = "hello python"
print(s.upper())       # 输出:HELLO PYTHON
print(s.lower())       # 输出:hello python
print(s.capitalize())  # 输出:Hello python
print(s.title())       # 输出:Hello Python

s2 = "PyThOn"
print(s2.swapcase())   # 输出:pYtHoN

三、字符串查找与判断函数

1. 查找子串位置

  • find():找不到返回 -1(推荐)
  • index():找不到直接报错
s = "I love Python"
print(s.find("Python"))  # 输出:7(子串起始索引)
print(s.find("Java"))    # 输出:-1
print(s.index("love"))   # 输出:2
# print(s.index("Java")) # 报错:ValueError

2. 统计子串出现次数:count()

s = "ababa abc"
print(s.count("ab"))  # 输出:2

3. 字符串判断(返回 True/False)

函数
作用
startswith(子串)
判断是否以指定子串开头
endswith(子串)
判断是否以指定子串结尾
isalpha()
判断是否全是字母
isdigit()
判断是否全是数字
isalnum()
判断是否是字母+数字(无符号)
isspace()
判断是否全是空白字符
s = "Python123"
print(s.startswith("Py"))  # True
print(s.endswith("123"))   # True
print(s.isalpha())         # False(包含数字)
print(s.isdigit())         # False
print(s.isalnum())         # True

四、字符串替换与分割函数

1. 替换子串:replace(旧子串, 新子串, 替换次数)

s = "Hello Java Java"
print(s.replace("Java""Python"))    # 输出:Hello Python Python
print(s.replace("Java""Python"1))# 输出:Hello Python Java

2. 分割字符串:split(分隔符, 分割次数)

按指定符号分割字符串,返回列表

s = "苹果,香蕉,橘子,葡萄"
print(s.split(","))  # 输出:['苹果', '香蕉', '橘子', '葡萄']

s2 = "a b c d"
print(s2.split())    # 默认按空格分割:['a', 'b', 'c', 'd']

3. 去除首尾空白/指定字符:strip()

  • strip():去除首尾空白(空格、换行、制表符)
  • lstrip():仅去除左侧
  • rstrip():仅去除右侧
s = "  Hello Python  \n"
print(s.strip())   # 输出:Hello Python

s2 = "!!!666!!!"
print(s2.strip("!"))  # 输出:666

五、字符串格式化函数

1. f-string(Python3.6+ 推荐)

name = "小明"
age = 20
print(f"我叫{name},今年{age}岁")  # 输出:我叫小明,今年20岁

2. format() 格式化

print("我叫{},今年{}岁".format("小红"18))
print("我叫{name},今年{age}岁".format(name="小刚", age=22))

3. 百分号 % 格式化(老式写法)

print("我叫%s,今年%d岁" % ("小李"19))

六、字符串填充与对齐函数

1. 居中对齐:center(长度, 填充符)

2. 左对齐:ljust()

3. 右对齐:rjust()

s = "Python"
print(s.center(10"*"))  # 输出:**Python**
print(s.ljust(10"-"))   # 输出:Python----
print(s.rjust(10"="))   # 输出:====Python

七、高频面试小技巧

  1. 快速反转字符串s[::-1]
  2. 判断字符串是否为空if not s:
  3. 大小写不敏感比较s1.lower() == s2.lower()
  4. 批量替换多个字符:用 str.translate()

总结

  1. 基础操作:len()+*、切片是字符串核心用法
  2. 大小写/查找/替换/分割:日常处理文本最常用
  3. 判断函数:startswithisdigit 等返回布尔值,适合条件判断
  4. 格式化优先用 f-string,简洁高效

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  1. CONNECT:[ UseTime:0.000726s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000944s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000307s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000615s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000747s ]
  8. SELECT * FROM `article` WHERE `id` = 490270 LIMIT 1 [ RunTime:0.001024s ]
  9. UPDATE `article` SET `lasttime` = 1783118658 WHERE `id` = 490270 [ RunTime:0.008308s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000270s ]
  11. SELECT * FROM `article` WHERE `id` < 490270 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000589s ]
  12. SELECT * FROM `article` WHERE `id` > 490270 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003531s ]
  13. SELECT * FROM `article` WHERE `id` < 490270 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.095240s ]
  14. SELECT * FROM `article` WHERE `id` < 490270 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.119023s ]
  15. SELECT * FROM `article` WHERE `id` < 490270 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.019180s ]
0.320365s