Why this is not working?

Question

def m(x,y):
return x*y
def p(x,y):
return x+y
def r(x,y):
return x-y
def impr(ordr, x, y):
return ordr(x,y)

n1=int(input("n1 :"))
n2=int(input("n2 :"))
entr=str(input("que? "))

print(impr(entr, n1, n2))

print(impr(m, 3, 3))
print(impr(p, 3, 3))
print(impr(r, 3, 3))

I can't understand why that code is giving me an error, but when I delete this part:
n1=int(input("n1 :"))
n2=int(input("n2 :"))
entr=str(input("que? "))

print(impr(entr, n1, n2))

It's working fine.
Can any one help me plz?

Answer 1

Ofcourse.
It results in an error because you are trying to call a string.

Try to change the line:
entr=str(input("que? "))

To:
entr=eval(str(input("que? ")))

And because the input function always returns a string, you can remove the str function:
entr=eval(input("que? "))

Answer 2

Some people anyways discourage the use of eval function, you can fix this with a dictionary:
d = {"m": m, "p": p, "r": r}
And change the line:
entr=str(input("que? "))
To:
entr=d[input("que? ")]

Answer 3

Thanks a lot Seb TheS !!!!