Comment #9 on issue 1491 by Toon.Verstraelen: generalize mainvar in
LatexPrinter
http://code.google.com/p/sympy/issues/detail?id=1491
Ordering in _print_Add should not only be a part of the LatexPrinter. Can't
we do
this in the Printer base class? One could implemented an iterator method
like this:
class Printer(object):
def iter_terms(self, expr):
if not isinstance(expr, Add):
raise TypeError()
if self.add_cmp is None:
for arg in expr.args:
yield arg
else:
for arg in sorted(expr.args, cmp=self.add_cmp):
yield arg
This iter method can be used by all printers who feel the need for it.
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