Updates:
        Cc: [email protected]

Comment #2 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

Actually, _compare_pretty is not even used by the printer by default any more. compare_pretty now calls sort_key(). Does the old printing order still use it? If not, it should be removed (see also issue 1491).

It appears that in a lot of cases, compare_pretty is being used with cmp_to_key. This is wrong. It should just use default_sort_key (or some variation of sort_key()).

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