FreeCAD

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# Example how to use the basic sketcher tools
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from Sketcher import *
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from Part import *
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from FreeCAD import *
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import FreeCAD as App
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# set some constances for the constraints
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StartPoint = 1
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EndPoint = 2
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MiddlePoint = 3
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# create a document and a Sketch object
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if App.activeDocument() is None:
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    App.newDocument()
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f = App.activeDocument().addObject("Sketcher::SketchObject", "Sketch")
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# add geometry to the sketch
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f.Geometry = [
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    LineSegment(Vector(0, 0, 0), Vector(2, 20, 0)),
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    LineSegment(Vector(0, 0, 0), Vector(20, 2, 0)),
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]
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# add constraints to the sketch
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f.Constraints = [Constraint("Vertical", 0), Constraint("Horizontal", 1)]
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# recompute (solving) the sketch
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App.activeDocument().recompute()
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# add another constraint to tie the start points together
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l = f.Constraints
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l.append(Constraint("Coincident", 0, StartPoint, 1, StartPoint))
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f.Constraints = l
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# again recompute
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App.activeDocument().recompute()
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f.Geometry
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