Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3882 by trel...@psu.edu: divisors() is not type-consistent
http://code.google.com/p/sympy/issues/detail?id=3882
Ran into a bug today with divisors()
The issue is that divisors() is not consistent in the type of the factors
it returns. If it is passed an int, then all returned factors are ints.
But if it is passed something of type sympy.core.numbers.Integer, then the
returned list can contain int's and sympy.core.numbers.Integer's. This
leads to something I found real confusing at first...
In [57]: set(divisors(4)).union(set(divisors(numbers.Integer(2))))
Out[57]: set([1, 2, 2, 4])
There are several simple ways to fix this. But are there any particular
conventions that apply? Should all the factors have the same type as the
original? Or should we escalate the type of all of the factors returned?
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