# untested but something like...
m = {}
def func(nc):
return 2*nc # whatever your rule is
def product_bases(w):
nc = w.args_cnc()[1]
if len(nc) == 2 or len(nc) == 1 and nc[0].is_Pow and nc[0].exp == 2:
return Mul._from_args(nc)
def updater(p, func):
p2 = product_bases(p)
if p2 and p2 not in m:
m[p2] = func(p2)
return m[p2]
return p
(15*ex**2 + 6*ey*ex).xreplace(Transform(lambda k: updater(k, func), lambda
w: w.is_Mul))
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