[PyQt] Expandable list as in designer

[Mads Ipsen]

How do I create a list with buttons for expanding subgroups as is done 
in Qt's designer app? Screenshot of the desired functionality is attached.

Best regards,

Mads

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+-------------------------------------------------------------+
| Mads Ipsen, Scientific developer                            |
+-------------------------------+-----------------------------+
| QuantumWise A/S               | phone:         +45-29716388 |
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