Fix #23: Make Field.Access NotIterable
Why?
Sympy does not try to iterate when the object is NotIterable. If it has __iter__ but iter throws it will only sometimes think its not iterable.
Edited by Stephan Seitz
Why?
Sympy does not try to iterate when the object is NotIterable. If it has __iter__ but iter throws it will only sometimes think its not iterable.