Convert a string to a callable function in Python

Question

I want to take written function (string) from a user input and convert it to a callable function in Python. How to achieve it despite any security concerns?

Example (string):

""" def test(): \n print('success') \n return 'success' """

I want to call / evaluate the said string by calling test() and make it print to the console.

Answer 1

Try this, using the compile method combined with eval or exec：

a = compile("""def test(): \n print('success') \n return 'success' """, "", "exec")
eval(a)

test()

Answer 2

When appropriate, this is a job for the exec function.

>>> exec("""def test(): \n print('success') \n return 'success' """, globals())
>>> test()
success
'success'