To get all function from an expression, one can do
```
from sympy import *
f = Function('f')
x = Symbol('x')
y = f(x) + 2 * sin(x)
for fun in y.atoms(Function):
print(fun.func)
```
which in this case will print out `f` and `sin`.
I would now like to distinguish between function that I defined myself
(`f`) the ones that come from elsewhere. I though about subclassing
`sympy.Function`, but apparently it's not exactly meant to be used that way
[1].
Any hints?
Cheers,
Nico
[1] https://groups.google.com/forum/#!topic/sympy/pU81Trc_Xr8
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