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Isinstance() determines if an object is an instance of a given class

# It has the following syntax: isinstance(obj1, obj2) class C1(object): pass class C2(object): pass c1 = C1() c2 = C2() print isinstance(c1, C1) print isinstance(c2, C1) print isinstance(c1, C2) print isinstance(c2, C2) print isinstance(C2, c2) print isinstance(4, int) print isinstance(4, str) print isinstance('4', str)