python中扩展运算符的非原位版本

Question

什么是精简的pythonic非现场版本的扩展？我厌倦了写作

x = [ 1,2,3 ]
x.extend([4,5])
f(x)

只想：

 f( x.extend( [4,5], inplace=False ) )

或其他什么

Answer 1

如何使用+运算符

def f(l):
    return l

x = [1,2,3]

>>> id(x)
48474312         # Note the id

>>> x = f(x + [4,5])
[1, 2, 3, 4, 5]

>>> id(x)
43637016         # Different id, that means not in-place