【python学习笔记】函数参数传递方法
作者:互联网
1.位置传递
def message(name, address):
return 'my name is %s ,my home locate in %s.' %(name,address)
print(message('lily','shanghai'))
调用 message,分别把lily,shanghai 传递给name,address
2.关键字传递
def message(name, ago, address):
return 'my name is %s ,%s years ago,my home locate in %s.' %(name, ago, address)
关键字传递,可以无视参数顺序
print(message(name = 'lily', address = 'shanghai', ago = 12))
关键字和位置混用,位置参数要在关键字前面
print(message('lily', address = 'shanghai', ago = 12))
3.默认值参数
def message(name, ago, address='shanghai'):
return 'my name is %s ,%s years ago,my home locate in %s.' %(name, ago, address)
address 该参数没有给传递值,参数赋予默认值
print(message(name='lily', ago=12))
第二次调用函数的时候,address被赋值为beijing,不再使用默认值。
print(message(name='lily', address='beijing', ago=12))
4.包裹传递
参数被all收集,type: tuple
def message(*all):
print(all)
print(type(all))
message('a','b','c')
参数被collect收集,type: dict
def age(**collect):
print(collect)
print(type(collect))
age(lily=12, xiaoming=13, sare=14)
结果:
('a', 'b', 'c')
<class 'tuple'>
{'lily': 12, 'xiaoming': 13, 'sare': 14}
<class 'dict'>
包裹传递的关键在于定义函数时,在相应元组或字典前加*或**
5.解包
tuple1 = [1, 4, 6]
dict1 = {'a': 'test1', 'b': 'test2', 'c': 'test3'}
print('dict1', dict1)
def use(a, b, c):
print(a, b, c)
use(**dict1) # 把字典参数解包 此时相当于关键字参数传递 名字和函数定义的参数名必须要一一对应
use(*tuple1) #把元组解包 此时相当于位置参数传递
结果:
dict1 {'a': 'test1', 'b': 'test2', 'c': 'test3'}
test1 test2 test3
1 4 6
标签:ago,name,python,笔记,参数传递,address,print,message,lily 来源: https://www.cnblogs.com/wyr-myblog/p/14096379.html