Comment #4 on issue 2074 by asmeurer: dsolve(diff(D(t), t) - k1*(B + C2*exp(-k*t) - D(t)), D(t), 'nth_linear_constant_coeff_variation_of_parameters') gives AttributeError: 'tuple' object has no attribute 'match'
http://code.google.com/p/sympy/issues/detail?id=2074
I just don't understand why you used it on compare_pretty, when the key equivalent, sort_key, already existed. Perhaps you didn't know that at the time?
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