On Tuesday, September 9, 2014 4:44:33 PM UTC+1, Nils Bruin wrote:
>
> In python, looking up a global flag is going to be relatively slow,
> because, if addressed by its proper name, it involves checking several
> __dict__s
>
Which is why it needs to be a cdef bool as I wrote earlier.
sage: sage: cython("""
....: cdef bint sage_citation_enabled = False
....: cpdef cite():
....: if sage_citation_enabled:
....: raise NotImplementedError()
....: """)
sage: def t2(a):
....: return 2*a
....:
sage: def t4(a):
....: cite()
....: return 2*a
....:
sage: timeit('t2(20)', number=100000)
100000 loops, best of 3: 360 ns per loop
sage: timeit('t4(20)', number=100000)
100000 loops, best of 3: 377 ns per loop
Not really noticable any more, especially considering that multiplying-by-2
is a) something that really should be implented in Cython to avoid Python
overhead and b) not something that you would cite anyways.
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