Python solve problem with string operation

[Tim Chase]

On 2014-01-17 00:24, 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.

I'm not sure what constitutes "just using string operations", but
it's quite simple with stdlib tools:

  >>> from itertools import groupby
  >>> ''.join(k for k,v in groupby("344111133311222223377"))
  '34131237'

-tkc