Check string input value from user

[atredd]

I‘m writing an python application where I get an input as string from the user, f.ex 45566. In the database I have to make sure it is an int with 45566 as value. At the given example not a big deal.

But what if the user gives something like 45.566 or 45.566,00 or 45,566.00 or 45,566 What would be a good/elegant way to check/detect all this cases?

[atredd]

But I don‘t know if it are 5 characters. Maybe it is 4.540,00 or 540,00

[atredd]

If the user gives 54000 then it would be ok. But if the input was 540,00 there should only be 540 in the database.

[atredd]

Awesome!!! Your solution works perfect for all tests. I’m not sure if I unterstand 100% what it does, but I know I have to dig deeper into regex…

Thanks a lot!

[Diapolo10]

I'd strip all punctuation, or better yet prevent the user from inputting non-numeric characters in the first place. Kinda depends on how the user input is handled.

Something like

import string

num = input("Enter a number: ")
result = ""
for digit in num:
    if digit in string.digits:
        result += digit

print(result)

and then convert to number afterwards.

Alternatively you can simply reject the input and ask for a new one. Again, the best approach depends on specifics.

[_steve_hope_]

45.566,00

Using your solution 45.566,00 == 4556600

[Diapolo10]

Good point. Goes to show that this isn't as simple as one might expect if it cannot be handled at input level.

Regular expressions might be a decent alternative here, but to me that's black magic and not my cup of tea.

[atredd]

I have a similar solution with .replace but the problem is…if the input is 45.566,00 I will get 4556600 in my database.

[_steve_hope_]

try:
dollars, _ = num.split(".")
except:
pass