In Python use the isinstance of to determine the variable type

One, the isinstance ()

In Python, you can use two functions, type() and isinstance(), to determine the type of an object, and the isinstance() function is more convenient than type.

# coding=utf-8

 

a = 10

 

def b():

    pass

 

print isinstance(a,(int,str))

print isinstance(a,(float,str))

print isinstance(b,(str,int))

 

class c:

    pass

 

obj = c()

 

print isinstance(obj,(c,int))

Execution results:

 

True

False

False

True

Ii. Difference between isinstance and type

The difference between isinstance and type is:

class A:

    pass
class B(A):

    pass
isinstance(A(), A)  # returns True

type(A()) == A      # returns True

isinstance(B(), A)    # returns True

type(B()) == A        # returns False

The difference is that it doesn't work for types like subclass, so it's highly recommended that you don't use type to determine the type of an object.