Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3968 by thilina....@gmail.com: factor_list() error Python3
http://code.google.com/p/sympy/issues/detail?id=3968
Following function call generate an error in Python3 but work well in
Python2.
factor_list(x*(x+y))
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/home/thilinarmtb/GSoC/sympy/sympy/polys/polytools.py", line 5675,
in factor_list
return _generic_factor_list(f, gens, args, method='factor')
File "/home/thilinarmtb/GSoC/sympy/sympy/polys/polytools.py", line 5423,
in _generic_factor_list
fp = _sorted_factors(fp, method)
File "/home/thilinarmtb/GSoC/sympy/sympy/polys/polytools.py", line 5322,
in _sorted_factors
return sorted(factors, key=key)
TypeError: unorderable types: list() < int()
Similarly following calls generate the same error:
[1] factor_list(y*(x+y)), factor_list(x*y + y**2)
[2] factor_list(x*(x+y+z)), factor_list(x**2+x*y+x*z)
[3] factor_list((x + 1)*(x + y))
But the following don't:
[4] factor_list(x*(x**2 + y**2)), factor_list(x**3 + x*y**2)
[5] factor_list(x**3 - x), factor_list(x*(x**2 - 1))
[6] factor_list(x**2 + x*y + x + y)
[7] factor_list((x + z)*(x + y)), factor_list(x**2 + x*z + y*x + y*z)
Here [6] is mathematically same as [3]. But only [3] gives the error.
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