[PyQt] Limit the height of a Layout

[starglider develop]

Hello,
I'm a newby and I have a question:
how can I limit the height of a QHBoxLayout?
e.g.:
There is a  central widget with a QHBoxLayout that as two QTableWidget and I
want to limit the size of the first QTableWidget to 300 points,
but let the second QTableWidget grow until the limit of the screen.

Thank you in advance for your help.
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