感謝作者和譯者，向你們致敬，辛苦了！

文章地址：Python進階

args 和 kwargs

*args 是用來發(fā)送一個非鍵值對的可變數(shù)量的參數(shù)列表給一個函數(shù).

def test_var_args(f_arg, *argv):
    print("first normal arg:", f_arg)
    for arg in argv:
        print("another arg through *argv:", arg)

test_var_args('yasoob', 'python', 'eggs', 'test')

輸出內容：

first normal arg: yasoob
another arg through *argv: python
another arg through *argv: eggs
another arg through *argv: test

**kwargs 允許你將不定長度的鍵值對, 作為參數(shù)傳遞給一個函數(shù)。

def greet_me(**kwargs):
    for key, value in kwargs.items():
        print("{0} == {1}".format(key, value))

greet_me(name="yasoob")

輸出內容：

name == yasoob

使用 *args 和 **kwargs 來調用函數(shù)

def test_args_kwargs(arg1, arg2, arg3):
    print("arg1:", arg1)
    print("arg2:", arg2)
    print("arg3:", arg3)

args = ("two", 3, 5)
test_args_kwargs(*args)
print("---")
kwargs = {"arg3": 3, "arg2": "two", "arg1": 5}
test_args_kwargs(**kwargs)

輸出內容：

arg1: two
arg2: 3
arg3: 5
---
arg1: 5
arg2: two
arg3: 3

什么時候使用它們？

做測試時，可以把API調用替換成一些測試數(shù)據(jù)

import someclass

def get_info(self, *args):
    return "Test data"

someclass.get_info = get_info