Isnumeric() function don't works correctly.

Question

I am working on a affine cipher, and I want to add the possibility to use negative numbers. I have in my program a condition for verify if the keys entered by the user are integers using the isnumeric() function.
But, as you can see on my program, I had to remove the "-" sign using the replace() function to verify if the string is a number. But, when this test occur It tells me that it's not a number...
What have I done wrong ?

P. S. : I know that after correct this problem I have to make a backup for the initial keys to recover them after replace the string.
https://code.sololearn.com/c4n2rDZPx8yX/?ref=app

Answer 1

def isValid(message):
allowed="0123456789-"
if all([i in allowed for i in message]):
return True
return False

Answer 2

in stead of answering, could i ask a question?😳😳😳😳

Answer 3

Thanks you :D

Answer 4

Of course you can !
But bro if it's because my english is bad or I look like a script kiddie I apologize x)

Answer 5

What does the following code do ?

if replacedA.isnumeric() == False or replacedB.isnumeric() == False

Answer 6

It supposed to stop the program if replacedA or replacedB are not numbers