I am coding a str() function for a custom object. The object is a liner
differential operator that consists of a linear combination of sympy
expressions and partial derivatives (defined in a class I have defined
and have their own str() function). The problem is to know when to
represent a term in the linear differential operator str() with
str(sympy expression)+str(partial derivative)
or
'('+str(sympy expression)+')'+str(partial derivative)
that is does str(sympy expression) have low level instances of '+' or
'-' in it as opposed to '+' or '-' being used in functions within the
expression such as sin(x+y) or exp(-x)?
Any suggestions would be appreciated before I resort to using grep on
str(sympy expression).
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