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From: marduk <marduk@python.net>
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Subject: Re: Issue with my code
Date: Tue, 05 Feb 2013 13:56:55 -0500
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On Tue, Feb 5, 2013, at 01:38 PM, maiden129 wrote:
> Hi,
> 
> I'm trying to create this program that counts the occurrences of each
> digit in a string which the user have to enter.
> 
> Here is my code:
> 
> s=input("Enter a string, eg(4856w23874): ")
> s=list(s)
> 
> checkS=['0','1','2','3','4','5','6','7','8','9']
> 
> for i in s:
>     if i in checkS:
>         t=s.count(i)
>         if t>1:
>             for k in range(1,t):
>                 s=s.remove(i)
>                 print(i, "occurs", t,"times.")
> 
>         elif t==1:
>             print(i,"occurs 1 time.")
>     else: pass
> 
> but it keeps showing this error:
> 
>  t=s.count(i)
> AttributeError: 'NoneType' object has no attribute 'count'

s=s.remove(i) does not return a new list but modifies the list  in
place.

So you probably just want

>>> s.remove(i)

Also, there are various inefficiencies in your code, but that is the
main issue with the AttributeError.