Okay, now that I've fixed the import, there is another Travis error about
the doctests that I do not understand. When running the doctests for
type_A, travis gives the following error:
Failed example:
c = CartanType('A4')
Exception raised:
Traceback (most recent call last):
File "/usr/lib/python2.6/doctest.py", line 1253, in __run
compileflags, 1) in test.globs
File "<doctest sympy.liealgebras.type_A.TypeA.cartan_matrix[1]>", line 1,
in <module>
c = CartanType('A4')
File
"/home/travis/virtualenv/python2.6/lib/python2.6/site-packages/sympy/liealgebras/cartan_type.py",
line 17, in __call__
return type_A.CartanType(n)
File
"/home/travis/virtualenv/python2.6/lib/python2.6/site-packages/sympy/liealgebras/cartan_type.py",
line 10, in __call__
c = list(c)
TypeError: 'int' object is not iterable
c isn't an int object, it's a string, and so it can be turned into a list.
This error doesn't come up when running tests on the actual code, so I do not
know why it would come up in doctests.
Sorry for having so many questions.
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