functools中 chain&partial的用法

from itertools import chain

v1 = [1,2,3,4]
v2 = [5,6,7,8]

for item in chain(v1,v2):
    print(item)

from functools import partial

def func(a1,a2):
    
    print(a1 + a2) # 60


new_func = partial(func,20)  # 重新封装func,把20作为第一个参数传递
new_func(40) 

from functools import partial

def func(a2):

    print(a2) # aaaa


new_func = partial(func,'aaaaa')  # 重新封装func,把20作为第一个参数传递
new_func()