Hi Crístian,
I like the idea of cleanup, but for python projects, we should comply with PEP8[1], which limit all lines to a maximum of 79 characters. So after we can all files pep clean, it will resolve the line length problem too.
If you have interest in the pep8 clean, you could use the command line tool pep8 and or vim plugin[2] to check if a python file is pep8 clean. After the cleanup, we need put it to the list of PEP8_WHITELIST in Makefile.am. It can guarantee the files are checked when 'make check-local' is executed.
[1] http://www.python.org/dev/peps/pep-0008/#maximum-line-length
[2] https://github.com/kimchi-project/kimchi/wiki/PEP8-Checking-Using-Syntastic