Comment #3 on issue 2436 by asmeurer: eval(str(Derivative()))
http://code.google.com/p/sympy/issues/detail?id=2436
Unless we extend D even further to make it act like Derivative if given
multiple arguments. But that's probably a bad idea :)
So we need to fix str(Derivative) to either print "Derivative" instead
of "D", or implement the D operator and change the output to be consistant
with the correct syntax.
The first way would work right now and would be very easy to fix.
The second way, if D were implemented, would provide a more concise str()
output, and also be unchanging across normal derivatives and derivatives at
a point.
Unless someone has plans to implement D right now, let's just do the first
fix (replace "D" with "Derivative"). We can then decide to do the second
or not when D is implemented.
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