String into int without errors

Question

I am trying to make a code that converts string into int and doesn't make any errors when the string is letters. My idea is to check if that string is numbers and if it is then it would do something. If it is not, it will print something and will go back to the start of the function. Example:

i = ()
def converter(i):
    i = input()
    if isinstance(i, int) == True:
        print('i is an integer')
    else:
        print('i is not an integer')
        converter(i)
#doesn't work :(

Or something along the lines. The idea is for the program not to crash when a string is typed in and that's why I can't use i = int(input()). Thanks in advance and have a nice day!

Just use a try and except value error.. it's literally it's purpose — Johnny John Boy, Apr 14 '21 at 08:34
`i = input()` means `i` will **always** be a `str` object, and `isinstance(i, int)` will always be False — juanpa.arrivillaga, Apr 14 '21 at 08:40

score 1 · Answer 1 · answered Apr 14 '21 at 08:32

1

I'd approach it more like this:

def converter(your_string):
    try:
        the_integer = int(your_string)
        print(the_integer)
    except ValueError:
        print("Catch Your Error, So Not An Error")

answered Apr 14 '21 at 08:32

Johnny John Boy

3,009
5
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score 0 · Answer 2 · answered Apr 14 '21 at 08:35

0

You can simply use isdigit() to check the integers in string

a=input()
for i in range(len(a)):
    if a[i].isdigit():
        #integer is present
    else:
        #notpresent

answered Apr 14 '21 at 08:35

Scrapper

182
3

you can just use `a.isdigit()` – juanpa.arrivillaga Apr 14 '21 at 08:40

wvdgoot · Answer 3 · 2021-04-14T18:50:41.603

0

You can use a regular expession to filter out non-numeric characters from your string:

>>> import re
>>> re.sub(r"\D", "", "1324l1kj234klj1235")
'132412341235'

Your script could then be

import re

def converter(string):
    return re.sub(r"\D", "", string)

i = input()
print(converter(i))

edited Apr 14 '21 at 18:50

answered Apr 14 '21 at 08:38

wvdgoot

303
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String into int without errors

3 Answers3