A problem with some OO code.

[TPJ]

Thank you VERY much!

These other errors are not so serious. I think I'll fix them soon. The
most important thing is that now I'm ready to work on that code again.
Life is beautiful again!

Damn, I knew it is some very stupid mistake. I must learn how to use
that pylint, instead of asking people on the web such a stupid
questions.

(The sad thing is that I'm the only one developer, who works on that
code. I think I had just stuck before I sent the first message in this
topic.)