[PyQt] flexible column widget

[c.buhtz at posteo.jp]

I asked in past about it and again I find it really hard to "find
something" I am looking for in PyQt5. There is only the reference guide.

Tutorials or topic overviews like other libraries offer are not
available. And for that current topic I miss the concrete word I should
look for.

I am want to arrange some widgets (e.g. lists?) in three columns on the
main window.

The user should be able to "touch" the borders between two columsn
with the mouse and drag it horizontal to make one column bigger and the
other smaller.

Is there something in PyQt5?
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