Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2783 by [email protected]: Error handling needs improvement if
RigidBodies don't have an attribute set
http://code.google.com/p/sympy/issues/detail?id=2783
If there is a RigidBody object (or Particle, etc) that doesn't have all of
it's attributes set correctly, it is hard to determine the error when
calling Kane.kanes_equations()
For example if the mass is set to None in a Rigidbody the error from
kanes_equations() is:
AttributeError: 'NoneType' object has no attribute 'subs'
The error should explicitly tell you that the mass is missing (or whatever
other attribute is not there).
This is also a result of not requiring the user to specify all of the
attributes of a RigidBody in it's __init__ method. The __init__ method
should require the needed attributes and at least give the user a warning
if they didn't supply all of the required attributes of a RigidBody.
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