python中NONE是 什么
时间: 2023-08-20 14:05:02 浏览: 92
在Python中,`None`是一个特殊的常量,表示对象不存在或没有值。它通常用于表示空值或占位符。在函数中,如果没有返回值,通常会返回`None`。`None`是Python中的一个内置对象,它不是0、False或空字符串,而是一个唯一的对象,可以用`is`来判断是否为`None`。例如:
```python
x = None
if x is None:
print("x is None")
```
输出:
```
x is None
```
需要注意的是,`None`不等于任何其他对象,包括空字符串、空列表等,因为它们都是具有自己的类型和值的对象。
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