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I want to change the data source of a layer (non geometric, just a table of fields) created from a .txt file. I know how to do it manually but I want to do it with the Python console. I have tried the setDataSource() command but I don't quite understand the arguments.

from qgis.core import QgsDataSourceUri

uri = QgsDataSourceUri()
uri.setDataSource("Path_to_new_source_txtfile","layer_name","memory")

This is the code I tried to use to change the source file, it didn't get me any error but it didn't change the source file either.

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You need to call the setDataSource() function from the actual layer, not from the class itself:

layer = iface.activeLayer()
layer.setDataSource("Path_to_new_source_txtfile","layer_name","memory")
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