list() 和 [] 有什么区别 [英] What's the difference between list() and []

问题描述

以下代码有什么区别:

foo = list()

和

foo = []

Python 表明有一种做事方式，但有时似乎不止一种.

解决方案

一个是函数调用，一个是字面量:

<预><代码>>>>导入文件>>>def f1(): 返回列表()...>>>def f2(): 返回 []...>>>dis.dis(f1)1 0 LOAD_GLOBAL 0(列表)3 CALL_FUNCTION 06 RETURN_VALUE>>>dis.dis(f2)1 0 BUILD_LIST 03 RETURN_VALUE

使用第二种形式.它更 Pythonic，而且可能更快(因为它不涉及加载和调用单独的函数).

What's the difference between the following code:

foo = list()

And

foo = []

Python suggests that there is one way of doing things but at times there seems to be more than one.

解决方案

One's a function call, and one's a literal:

>>> import dis
>>> def f1(): return list()
... 
>>> def f2(): return []
... 
>>> dis.dis(f1)
  1           0 LOAD_GLOBAL              0 (list)
              3 CALL_FUNCTION            0
              6 RETURN_VALUE        
>>> dis.dis(f2)
  1           0 BUILD_LIST               0
              3 RETURN_VALUE        

Use the second form. It's more Pythonic, and it's probably faster (since it doesn't involve loading and calling a separate funciton).

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