Even with the constructor exposed, the sequence of steps to get to it isn’t obvious.
board = pcbnew.GetBoard()
ds = board.GetDesignSettings()
# ugly. exposes a public member not via an accessor method
nc = ds.m_NetClasses
foo = pcbnew.NETCLASSPTR(“foo”)
The nc variable (NETCLASSPTR) has lots of useful get’er set’er functions, like SetClearance, SetTrackWidth. These are easy to find in the python window. Just type “foo.” and you should get a popup of available functions. You can also run the function “dir(foo)”
Modify design rules from python