Python callable() built-in function

From the Python 3 documentation

Return True if the object argument appears callable, False if not. If this returns True, it is still possible that a call fails, but if it is False, calling object will never succeed. Note that classes are callable (calling a class returns a new instance); instances are callable if their class has a __call__() method.

Examples

>>> def my_function():
...     print('this is a test function')
...
>>> callable(my_function)
# True
>>> callable(True)
# False
>>> callable(1)
# False
>>> callable('a')
# False

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