How to call a function stored in another file from a Python program?

Question

If I have a text file that contains a python function definition, how can I make the function call from another Python program. Ps: The function will be defined in the Pytho

Answer 1

compile() and eval() can do the trick:

>>> code = compile('def foo(a): return a*2', '', 'exec')
>>> eval(code)
>>> foo
52: 
>>> foo(12)
53: 24

or with file:

with open(filename) as source:
    eval(compile(source.read(), filename, 'exec'))