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20个Python常用内置函数,80%的人只用到了20%

  • 2026-07-01 12:27:24
20个Python常用内置函数,80%的人只用到了20%

map/filter/sorted/enumerate/zip…

这20个函数

帮你少写90%的for循环

1、map函数,逐一对序列进行函数计算。

>>> list(map(lambda x: x*2, [1,2,3]))[246]

2、filter函数,对序列进行函数级的条件过滤。

>>> list(filter(lambda x: x>2, [1,2,3]))[3]

3、sorted函数,对序列进行排序操作。

>>> sorted([3,1,2], reverse=True)[321]

4、enumerate函数,按序对目标序列元素进行逐一操作。

>>> for i,v in enumerate(['a','b']):...     print(i,v)... 0 a1 b

5、zip函数,对多个序列对象进行按序打包重组。

>>> list(zip([1,2],[3,4]))[(1, 3), (2, 4)]>>> list(zip([1,2],[3,4,5]))[(1, 3), (2, 4)]>>> list(zip([1,2],[3,4,5],[6,7]))[(1, 3, 6), (2, 4, 7)]

6、any/all函数,全元素逻辑判断

# any -> 任意元素为真则为真 >>> any([0,0,0])False>>> any([0,0,2])True# all -> 全部元素为真则为真 >>> all([0,1,2])False>>> all([1,1,2])True

7、sum/max/min/divmod函数,计算目标对象的和、最大值、最小值,以及商和余数。

# 求和 >>> sum([2,4,7,3,1])17# 求最大值 >>> max([2,4,7,3,1])7# 求最小值 >>> min([2,4,7,3,1])1# 直接求商和余数 >>> divmod(10,3)(31)

8、len函数,计算目标对象的长度。

>>> len([1,2,3,4])4>>> len('hello world')11

9、isinstance函数,用于目标类型判断。

>>> isinstance(123intTrue>>> isinstance('123'int)False

10、getattr函数,获取对象的某个属性值。

>>> class animal():...     def __init__(self,name=''):...             self.name = name... >>> cat = animal('Rose')>>> getattr(cat,'name')'Rose'

11、setdefault方法,更安全访问字典,访问不存在的键则创建为默认值,已存在的键则读取当前值。

>>> d = {'a':1,'b':2,'c':3}>>> d.setdefault('d',0)0>>> d{'a'1'b'2'c'3'd'0}>>> d.setdefault('d',4)0>>> d{'a'1'b'2'c'3'd'0}

12、defaultdict函数,自动向字典中添加没有的元素为默认值

>>> from collections import defaultdict>>> d = defaultdict(int)>>> ddefaultdict(<class 'int'>, {})>>> d[2]0>>> ddefaultdict(<class 'int'>, {20})
这里要注意,defaultdict创建的字典虽然和python中的字典用法很像,但实际上是一种新的字典类型。

13、Counter函数,自动完成序列内各值的统计数据。

>>> from collections import Counter>>> Counter(['a','b','a','c','a']) Counter({'a'3'b'1'c'1})

14、chain函数,连接多个同类型对象。

>>> from itertools import chain>>> list(chain([1,2],[3,4])) [1, 2, 3, 4]

注意,上面这里使用了list()函数将chain的结果进行了列表转换。这是因为chain函数返回的是一个可迭代对象,使用时才会创建数据,为了展示必须使用list()函数进行强制类型转换。

15、partial函数,固定函数的部分参数。

>>> from functools import partial# 创建一个指数函数,底数、指数均可设置>>> def power(base,exponent):...     return base**exponent... # 将指数固定为2,实现平方计算函数 >>> square = partial(power,exponent=2)>>> square(3)9>>> square(4)16

16、reduce函数,对序列进行累积计算。

>>> from functools import reduce>>> reduce(lambda a,b: a+b, [1,2,3,4])10>>> reduce(lambda a,b: a*b, [1,2,3,4])24

17、next函数,让可迭代对象移动到下一个具体值。

>>> arr_iter = iter([1,2,3,4])>>> next(arr_iter)1>>> next(arr_iter)2>>> next(arr_iter)3

18、callable函数,判断目标对象是否可调用。

>>> callable(lambda x: x) True

19、globals/locals函数,获取所有全局变量、局部变量

>>> globals(){'__name__''__main__''__doc__'None'__package__'None'__loader__': <class '_frozen_importlib.BuiltinImporter'>, '__spec__'None'__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>}>>> locals(){'__name__''__main__''__doc__'None'__package__'None'__loader__': <class '_frozen_importlib.BuiltinImporter'>, '__spec__'None'__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>}

20、type-hint语法,让变量、函数返回值也有类型身份

# :用于变量类型注解 ,->用于函数返回值类型注解 def f(x: int) -> str:    pass

注意,虽然使用了type-hint语法,但其不像其他语言是类型强制的。在Python中,类型注解仅仅展示可读性,并不做类型锁定。

 End 转角  ·  遇见  ·  程序猿
-------------------------
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却总能创造无尽幻想

......

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  1. CONNECT:[ UseTime:0.001165s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002016s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007709s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.014004s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001696s ]
  6. SELECT * FROM `set` [ RunTime:0.002104s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001663s ]
  8. SELECT * FROM `article` WHERE `id` = 491314 LIMIT 1 [ RunTime:0.012140s ]
  9. UPDATE `article` SET `lasttime` = 1783090649 WHERE `id` = 491314 [ RunTime:0.010216s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007134s ]
  11. SELECT * FROM `article` WHERE `id` < 491314 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004511s ]
  12. SELECT * FROM `article` WHERE `id` > 491314 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011239s ]
  13. SELECT * FROM `article` WHERE `id` < 491314 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.046819s ]
  14. SELECT * FROM `article` WHERE `id` < 491314 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.164760s ]
  15. SELECT * FROM `article` WHERE `id` < 491314 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.161375s ]
0.675610s