how can I specify an input as the python code

Question

User enters an input like this: 4*3**2 Is there anyway to perform this, as a python code (not string)? I mean something like this:

x = input('Enter a operation: ') # 4*3**2
print('Answer is:', x) # expect: 'Answer is: 36'

How long evaluated code supposed to be?

Stepan Dyatkovskiy
– Stepan Dyatkovskiy

2021-08-17 06:26:39 +00:00
Commented Aug 17, 2021 at 6:26 — Stepan Dyatkovskiy
– Stepan Dyatkovskiy, Commented Aug 17, 2021 at 6:26
Related: stackoverflow.com/questions/15168765/…

tripleee
– tripleee

2021-08-17 06:27:47 +00:00
Commented Aug 17, 2021 at 6:27 — tripleee
– tripleee, Commented Aug 17, 2021 at 6:27

U13-Forward · Accepted Answer · 2021-08-17 06:21:31Z

3

You could use eval:

x = input('Enter a operation: ')
print('Answer is:', eval(x))

But the problem is that eval is unsafe and inefficient, see this for more information.

answered Aug 17, 2021 at 6:21

U13-Forward

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3 Comments

user15801675 Over a year ago

Hmm. But if someone could see eval() it could turn out to be really dangerous

U13-Forward Over a year ago

@Sujay I mentioned that under

DANIEL1475 Over a year ago

its insecure, because user can enter other thing and reveal my code, (is it correct?) so what if I use if statement to limit user and let him just use some special characters, like 1-9 and * and / and + and - ....?

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