python函数参数冒号_python函数形参后面加冒号

python 函数形参后面加冒号其实是添加注释， 告诉使用者每个形参、返回值的类型。这里只是建议类型，传入其他类型并不会报错。通过help函数可以查看注释的内容

# -*- coding:utf-8 -*-

def add_student(id:int=0, name:str="") -> bool:

print('add_student:', id, name)

print("函数注释", add_student.__annotations__)

return True

add_student('001', 'xiaohong')

help(add_student)

输出

Help on function add_student in module __main__:

add_student(id:int=0, name:str='') -> bool

个人认为Google风格的注释更加简洁：

# -*- coding:utf-8 -*-

def add_student2(id, name):

"""

This is a fun add_student2.

Parameters:

id - int

name - str

Returns:

bool

"""

print('add_student2:', id, name)

print("函数注释", add_student.__annotations__)

help(add_student2)

输出

Help on function add_student2 in module __main__:

add_student2(id, name)

This is a fun add_student2.

Parameters:

id - int

name - str

Returns:

bool