Converting a strng to an anonymous function

[Bruno Desthuilliers]

Nathan Seese a écrit :

I'm writing a program to sort files with arbitrary python code. The
method I'm using for that is to pass sort an anonymous function taken
from the arguments. I'm wondering how to change a raw string into an
anonyous function.

Care to give a couple more explanation about your use case ? There might
be better solutions than eval/exec...

 

[Nathan Seese]

I'm writing a program to sort files with arbitrary python code. The
method I'm using for that is to pass sort an anonymous function taken
from the arguments. I'm wondering how to change a raw string into an
anonyous function.

 

[bearophileHUGS]

I'm writing a program to sort files with arbitrary python code. The
method I'm using for that is to pass sort an anonymous function taken
from the arguments. I'm wondering how to change a raw string into an
anonyous function.

Is this enough for you?

L = [1, -5, 7, -9]
sorted(L, key=abs) [1, -5, 7, -9]
func = "abs"
sorted(L, key=eval(func)) [1, -5, 7, -9]
func = "abs(x)"
sorted(L, key=lambda x: eval(func))

[1, -5, 7, -9]

Bye,
bearophile

 

[Nathan Seese]

I'm writing a program to sort files with arbitrary python code. The
method I'm using for that is to pass sort an anonymous function taken
from the arguments. I'm wondering how to change a raw string into an
anonyous function.

Is this enough for you?

L = [1, -5, 7, -9]
sorted(L, key=abs) [1, -5, 7, -9]
func = "abs"
sorted(L, key=eval(func)) [1, -5, 7, -9]
func = "abs(x)"
sorted(L, key=lambda x: eval(func))

[1, -5, 7, -9]

Bye,
bearophile

Thanks, that works great!