On Fri, 17 Jan 2014 00:24:40 +0200, Nac Temha wrote:
> Hi everyone,
>
> I want to do operation with chars in the given string. Actually I want
> to grouping the same chars.
>
> For example;
>
> input : "344111133311222223377"
> operation-> (3)(44)(1111)(333)(11)(22222)(33)(77)
> output: "34131237"
> How can I do without list, regular expression. just using string
> operations. Using an effective methods of python for this problem.
You can do it on one line, but it looks really messy:
output = ''.join([{x:input[x]for x in range(len(input))}[x]for x in range
(len({x:input[x]for x in range(len(input))}))if(x==0 or {x:input[x]for x
in range(len(input))}[x-1]!={x:input[x]for x in range(len(input))}[x])])
It looks much better if you do it in steps:
a = {x:input[x]for x in range(len(input))}
b = [a[n]for n in range(len(a))if(n==0 or a[n-1]!=a[n])])
output = ''.join(b)
If you really want to do it using just 'string' ops:
for i in range(len(input)):
if (i==0):
output=input[0]
elif input[i]!=input[i-1]:
output+=input[i]
--
Denis McMahon, denismfmcma...@gmail.com
--
https://mail.python.org/mailman/listinfo/python-list
