I have error when I use exec() to call functions in python 3 [duplicate]

Question

I have this simple function:

def fu():
    return "great"

I need to call it by using a string,

So I tried this:

print(exec("fu()"))

But the the output I got was:

None

How do i fix it?

exec ignores the return value of a function, and always returns None, which is why none is printed. — user3483203
– user3483203, Commented May 12, 2018 at 14:32
There are quite a few smilar, maybe this one is closer: Use a string to call function in Python — wwii
– wwii, Commented May 12, 2018 at 14:56

Mehrdad Pedramfar · Accepted Answer · 2018-05-12 14:50:46Z

0

As in comments says you can not use exec for this purpose.
but eval will do what you want, full doc here:

>> eval('fu()')
"great"

Note that using eval is not the best practice.

There is a better way to access this function with globals or locals based on where you define your function, and I think it's better to use this instead of eval:

>> globals()['fu']()
"great"

edited May 12, 2018 at 14:50

answered May 12, 2018 at 14:35

Mehrdad Pedramfar

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