In pull request 589 I added an unflatten function to iterables which
groups elements of an interable into groups of 2 (by default). Is this
a good name? Are there any objections? Should this be in the
namespace?
>>> unflatten([1,2,3,4])
[(1, 2), (3, 4)]
>>> unflatten([1,2,3])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\utilities\iterables.py", line 72, in unflatten
raise ValueError('iter length is not a multiple of %i' % n)
ValueError: iter length is not a multiple of 2
>>>
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