黑猴子的家：python 函数 - 各种参数练习

1、参数 统一 个数

code

def t1(x,y):
    print(x,y)

#调用函数的时候，参数多了少了，报错
t1(1,2,3)

打印

Traceback (most recent call last):
  File "E:/workspace/python/sk14/day03/07_function7.py", line 7, in 
    t1(1,2,3)
TypeError: t1() takes 2 positional arguments but 3 were given

2、可传递至少0个参数

code

def t2(*args):
    print(args)

#多参数
t2(1,2,3)
t2(*[1,2,3])
t2(1,2)
t2(1)
t2()

打印

(1, 2, 3)
(1, 2, 3)
(1, 2)
(1,)
()

3、至少有 1 个参数

code

def t3(x,*args):
    print(x)

t3(1,2,3,4)
t3(1,2,3)
t3(1,2)
t3(1)

打印

1
1
1
1

4、字典参数**kwargs

code

def t4(**kwargs):
    print(kwargs)

t4(name='alex',age='8',sex='f')
t4(**{'name':'alex','sex':'女','age':'8'})

打印

{'name': 'alex', 'age': '8', 'sex': 'f'}
{'name': 'alex', 'sex': '女', 'age': '8'}

5、混合参数1

code

def t5(name,age=18,**kwargs):
    print(name)
    print(age)
    print(kwargs)

t5('heihouzi',sex='m',hobby='tesla')
t5('heihouzi',sex='m',hobby='tesla',age=43)

打印

heihouzi
18
{'sex': 'm', 'hobby': 'tesla'}

heihouzi
43
{'sex': 'm', 'hobby': 'tesla'}

6、混合参数2

code

def t6(name,age=18,*args,**kwargs):
    print(name)
    print(age)
    print(args)
    print(kwargs)

t6("heihouzi",4,5,6,sex='m',hobby='tesla')

打印

heihouzi
4
(5, 6)
{'sex': 'm', 'hobby': 'tesla'}

7、嵌套函数

code

def t7(name):
    loggers(name)

def loggers(n):
    print("from %s" % n)

t7("heihouzi")

打印

from heihouzi