Entering an expression with "input" command

[johnmnz]

I want to write a program that lets the user provide an expression "on the fly" as in
expression = input ("Enter the expression")
for x in range (-10,10):
y = evaluate(expression(x))
print (y)

The idea is that I want to evaluate a user-supplied expression without having to change the source code of my program. Does Python have such a function or library? Maybe something n sympy?

Thanks - John Mycroft

[wavic]

I don't for such a module but using evaluate is a "bit" dangerous. What if someones input is this: input subprocess ; subprocess.call(['rm', '-rf', '/home/$USER']) ?

[Larz60+]

Don't actually try wavic's example. It will erase disk!
He only meant to show dangerous example.
evaluate will actually execute code typed in!

[metulburr]

Maybe something n sympy?

yes sympy is a safe way to handle expressions