How can I check if a string represents an int, without using try/except?

Question

Is there any way to tell whether a string represents an integer (e.g., '3', '-17' but not '3.14' or 'asfasfas') Without using a try/except mechanism?

is_int('3.14') = False

is_int('-7') = True

Answer 1

For checking whether a string represents an int, without using try/except if your string is a positive integer you can use .isdigit.This method will only work with positive numbers.

'16'.isdigit()

If your string contains negative integers then you can try the following way:

s = '-17'

s.startswith('-') and s[1:].isdigit()