problem with for and if

[YBM]

Le 05/01/2015 15:27, Dariusz Mysior a écrit :
> I want search count of szukana in zmienna but code below counting all 12 letters from "traktorzysta" word
>
> szukana="t"
> zmienna="traktorzysta"
>
>
> def gen():
>      count=int(0)
>      for a in zmienna:
>          if szukana in zmienna:
>              count+=1
>          else:
>              continue
>      return count
>
>
> print("Literka '",szukana,"' w słowie ",zmienna,
>        "wystąpiła ",gen()," razy")

In the for loop a is iterating through "traktorzysta" ("t", then "r",
then "a", ...): 12 steps

moreover the expression szukana in zmienna is always true (as t is
a letter of "traktorzysta"), so count += 1 is executed twelve times.

def gen():
     count=int(0)
     for a in zmienna:
         if a == szukana:
             count+=1
         else:
             continue
     return count

will work (even if quite ugly, why int(0)? why defining a function
without parameters? etc.)