Python: checking to see if a value is a certain object

Question

I know if the isinstance() method, which can be used to check if a value is a certain type. For instance,

num = 3
print isinstance(num, int)

Gives us True .

I have a custom made object now, called Project . Project has some attributes that are specific. One of my methods uses a Project as a parameter, and I want to validate that the input parameter is indeed of type Project . Will the same method work?

Answer 1

是的，即使Project是自定义类， isinstance(obj, Project)是查看obj是否为Project实例的正确方法。

Answer 2

Yes.

class A:
    pass

print(isinstance(A(), A))

prints "True".

Answer 3

The function works well.

class A:
    #some code

X=A()
if(isinstance(X, A)):
    print "hello"

prints hello