What does isinstance mean in python?

In python, isinstance means "determining type"; isinstance() is a built-in function used to determine whether an object is a known type, similar to type().

isinstance() function to determine whether an object is a known type, similar to type().

The difference between isinstance() and type():

• type() does not consider the subclass to be a parent class type and does not consider the inheritance relationship.

• isinstance() will consider the subclass to be a parent class type and consider the inheritance relationship.

If you want to determine whether two types are the same, it is recommended to use isinstance().

Syntax

isinstance(object, classinfo)

Parameters

• object -- Instance object.

• classinfo -- Can be a direct or indirect class name, a primitive type, or a tuple consisting of them.

Return value

If the type of the object is the same as the type of parameter two (classinfo), it returns True, otherwise it returns False.

Example:

>>>a = 2
>>> isinstance (a,int)
True
>>> isinstance (a,str)
False
>>> isinstance (a,(str,int,list))    # 是元组中的一个返回 True
True

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