not isinstance

isinstance是一个内置函数，用于判断一个对象是否是一个已知的类型。而not isinstance则是判断一个对象是否不是某个已知类型。例如，如果我们想判断一个变量不是整数或浮点数类型，可以使用not isinstance(data, (int, float))。如果该变量不是整数或浮点数类型，

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if not isinstance

if not isinstance(data, NoneType):
这段代码是用来判断变量data的类型是否为NoneType。引用中提到了可以使用isinstance函数来判断一个对象的类型。在这段代码中，我们通过isinstance(data, NoneType)来判断data的类型是否为NoneType。如果不是NoneType，则执行if语句中的代码块。

在引用中，我们可以看到type(None)的类型是<NoneType>，所以可以将NoneType作为isinstance函数的参数之一，用于判断变量的类型是否为NoneType。如果想判断多种类型，可以使用类似的语法，将多个类型作为isinstance函数的参数。

总结起来，以上代码片段是用来判断变量data的类型是否为NoneType的，如果不是，则执行相应的代码块。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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if not isinstance()

`isinstance()` is a built-in Python function that returns a boolean value indicating whether an object is an instance of a specified class or of a subclass thereof. The syntax of the `isinstance()` function is as follows:

isinstance(object, classinfo)

Here, `object` is the object being tested and `classinfo` is either a class object or a tuple of class objects. If `object` is an instance of `classinfo`, or of a subclass thereof, the function returns `True`; otherwise, it returns `False`.

The `not` keyword is a logical operator in Python that negates the boolean value of a statement. Therefore, `not isinstance(object, classinfo)` would return `True` if `object` is not an instance of `classinfo`, or of a subclass thereof.