Buildin Function Python Tutorial

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  4. Callable() tells if an object can be invoked via the function operator ()
# It returns True  if the object is callable and False otherwise
print callable(dir)              # built-in function
print callable(1)                # integer
def foo(): pass
print callable(foo)              # user-defined function
print callable('bar')            # string
class C(object): pass
print callable(C)                # class