Mám:1 http://cz.archive.ubuntu.com vivid-updates Release.gpg [933 B] Cíl http://cz.archive.ubuntu.com vivid-backports Release.gpg Cíl http://cz.archive.ubuntu.com ...

Short preamble: you should aim to write code that is bug-free and runs reasonably fast. Besides, your code should be easy for a moderately python-literate colleague to understand and make changes to.