python - Python中的null对象？(null object in Python?)

Question

我如何在Python中引用null对象？

  ask by Lizard translate from so

Answer 1

In Python, the 'null' object is the singleton None .

(在Python中，'null'对象是单例None 。)

The best way to check things for "Noneness" is to use the identity operator, is :

(检查“无效”的最佳方法是使用身份运算符， is ：)

if foo is None:
    ...