判断变量是否为NONE或False的几种常见写法(if not用法教程)

1、not用法

#Python编程语言学习：判断变量是否为NONE或False的几种常见写法(if not用法教程)

import random

x_lists=[None,False,'',0,[],(),{}]

# x=random.sample(x_lists, 1)

x=random.choice(x_lists)

print(x)

if not x:

   print('not x, x is False')

   

if x is None:

   print('x is None')

2、if not用法教程

y=2020

if not y is None:

   print('x is None')

if y is not None:

   print('x is None')