Jeff Shannon wrote:
Note also that functions which use exec cannot use the static namespace
optimization, and thus tend to be *much* slower than normal functions
In what circumstances will this be true? I couldn't verify it:
> cat fib.py
def fib1(n):
a, b = 0, 1
while True:
a, b = b, a + b
yield a
exec """\
def fib2(n):
a, b = 0, 1
while True:
a, b = b, a + b
yield a
"""
> python -m timeit -s "import fib" "fib.fib1(100)"
1000000 loops, best of 3: 0.714 usec per loop
> python -m timeit -s "import fib" "fib.fib2(100)"
1000000 loops, best of 3: 0.705 usec per loop
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