I was benchmarking some code (in particular the density() method of
matrices) and noticed code of the form
if not x.is_zero():
however, that's a lot slower than doing just
if x:
So, this makes me wonder: what is the reason for the is_zero() method?
Are there classes where "x.is_zero()" is not the same as "not x"?
sage: L = list(GF(2)); timeit('[x for x in L if x]')
625 loops, best of 3: 245 ns per loop
sage: L = list(GF(2)); timeit('[x for x in L if x.is_zero()]')
625 loops, best of 3: 323 ns per loop
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