Updates:
Labels: EasyToFix
Comment #3 on issue 2501 by asmeurer: diff(f(g(x)), x) gives a strange
answer
http://code.google.com/p/sympy/issues/detail?id=2501
Well, using a letter would be less confusing, unless that letter happens to
be used in an expression. I don't know why Dummys are not pretty printed
with a leading _ (you did use Dummy('1'), right?).
Like I said, the cleanest solution will be to add the D operator, which
will eliminate the need for Subs to represent derivatives evaluated at a
point.
But the 1 does look pretty bad. Let's replace it with Dummy('xi') for now.
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