Hello,
I think I found a bug. Calling .count_ops() on an expression containing a
derivative raises a NameError.
In [1]: from sympy import *
In [2]: x = Symbol('x')
In [3]: f = Function('f')
In [4]: Dfx = f(x).diff(x)
In [5]: Dfx.count_ops()
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
...
/home/bw/myModules/sympy/core/basic.pyc in count_ops(self=D(f(x), x),
symbolic=True)
1009
1010 """
-> 1011 return Integer(len(self)-1) +
sum([t.count_ops(symbolic=symbolic) for t in self])
1012
1013 def doit(self, **hints):
NameError: global name 'Integer' is not defined
Best regards,
Bastian.
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