Post #3499: 
Kim_Quyen:
I have a Curve, I want to set up two types of Splines: Bezier / Poly assigned to a button. When i press the button, if the Splines are Bezier type will turn into Poly and vice versa.
Here is the code for Command tab:
sel_bezier_splines = [s for s in C.object.data.splines if [p for p in s.bezier_points if p.select_control_point]]; is_bezier = len(sel_bezier_splines) > 0; bpy.ops.curve.spline_type_set('INVOKE_DEFAULT', True, type='POLY' if is_bezier else 'BEZIER')
Or Custom tab with customizable icons and labels:
sel_bezier_splines = [s for s in C.object.data.splines if [p for p in s.bezier_points if p.select_control_point]]; is_bezier = len(sel_bezier_splines) > 0; L.operator("pme.exec", text="Bezier" if is_bezier else "Poly", icon='IPO_BEZIER' if is_bezier else 'IPO_CONSTANT').cmd = "bpy.ops.curve.spline_type_set('INVOKE_DEFAULT', True, type='%s')" % ('POLY' if is_bezier else 'BEZIER')
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