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gis - Dissolve Lines in Python

I have a shapefile with multiple lines. I am looking for a method to dissolve all the touching lines. This was possible in ArcMap but can't seem to do it either in Python nor QGIS:

Before: enter image description here

Desired output: enter image description here

This needs to be done on multiple lines, therefore doing it manually like in QGIS merge is not an option.

In ArcMap I used to Dissolve and multipart. Not needing to use any attributes.


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