Python Forum

I'm trying to work out how to test for an object being a function. Can you help?

def my_func():
    print("Running my function...")
# my_func()



random_func =my_func

#   Print the type of object.
print(type(random_func))
#   _.

#   Return true or false to the question.
print("Is this a function?", isinstance(random_func, function))
#   _.


#   Run the function.
random_func()

Error:
<class 'function'>
Traceback (most recent call last):
  File "/home/pi/Documents/Alan/Python/Test/function type.py", line 16, in <module>
    print("Is this a function?", isinstance(random_func, function))
NameError: name 'function' is not defined
>>> 

you can something like use this:

import types

JustForGiggles = True

def my_func():
    print('This is my function')

def tryit():
    if isinstance(my_func, types.FunctionType):
        print('my_func is a function')
    else:
        print('No, my_func is not a function sorry')

    if isinstance(JustForGiggles, types.FunctionType):
        print('JustForGiggles is a function')
    else:
        print('No, JustForGiggles is not a function sorry')

if __name__ == '__main__':
    tryit()

results:

Output:
my_func is a function
No, JustForGiggles is not a function sorry

Thanks Larz, that'll do nicely.

You can do by like this:

def is_function(x):
import types
return isinstance(x, types.FunctionType) \
or isinstance(x, types.BuiltinFunctionType)