How to determine whether python is a floating point number

#How does python determine whether it is a floating point number? The specific method is as follows:

isinstance() function

can be used to determine the type of a variable. It returns a Boolean value, False or True.

Like int, float, etc. are all basic variable types. In fact, classes are also a type of variables.

i=9，j=1.3
>>isinstance(i,float)
>>False
>>isinstance(j,float)
>>True

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