[Tutor] Python strings example

[Peter Otten]

On 26/04/2021 17:48, Manprit Singh wrote:
> Dear sir,
>
> consider a problem where I have to write a function that can return True if
> the string passed to the function contains at least one digit character and
> one alphabet character, else the function must return False. The way i am
> solving it is given below :
> def str_chk(word_tochk):
>      dig = False
>      alpha = False
>      for ele in word_tochk:
>          dig = dig or ele.isdigit()
>          alpha = alpha or ele.isalpha()
>      return dig and alpha
>
>
> st = "Abhay2"
> ans = str_chk(st)
> print(ans) returns True, which is correct as the string contains an
> alphabet as well as a digit character.
>
> st = "Abhay"
> ans = str_chk(st)
> print(ans) returns False . which is also correct as there is no digit
> character in the string now
>
> Any suggestions, if the solution can be improved .

I would perform the two tests separately. In the worst case you have to
iterate over the string twice, but if you're lucky you only have to scan
a small portion of the string.

def has_digits_and_alphas(s):
     return (
         any(c.isdigit() for c in s)
         and
         any(c.isalpha() for c in s)
     )