ValueError("polyline requires three or more pts")

[MatthiasJ1]

Seems like an unnecessary restriction.

[jdegenstein]

I agree. I think this should be changed.

[gumyr]

Polyline with two points is just a Line which probably means that someone has made a mistake which is why the check is there. Why do you see it as "unnecessary"?

[jdegenstein]

I see it as unnecessary because Polyline could be used in e.g. a programmatic setting (such as a python function) where the number of points is variable. Having to switch between Line and Polyline based on the number of points when the latter could generate a perfectly valid output seems like an arbitrary choice.

We haven't mentioned FilletPolyline which will fillet all "middle" points. Should FilletPolyline also change to a minimum of 2 points? I don't have a strong opinion either way.

[MatthiasJ1]

@jdegenstein exactly. Also from a purely from a semantics point of view, a 2 point polyline is valid. It's the same for FilletPolyline.

[jdegenstein]

Incorporated suggestions into the merged PR here #516