Response to SymPy integrate issue

[patrickwalls]

Let's write a response to the issue 14235 in SymPy.

[cbm755]

Some ideas:

>>> a = Symbol('a')
>>> p = Symbol('p', positive=True)
>>> r = Symbol('r', real=True)

Try those with integrate, what happens in each case and what should happen?

Printing of the "periodic" thing has improved a lot in sympy master.

For the real case r = Symbol('r', real=True), perhaps the result can be improved: we should file a new issue.