Am 30.04.2011 09:43 schrieb harrismh777:
On the other hand, I am very much interested in "yield," because of its
obvious persistent state, On the other hand, I don't like you fib()
function because it does not encapsulate the fib generator. I suppose
you are considering whatever module is holding the fib() code as the
encapsulation, but I thought the idea from the OP was to create a
generator that could be called and return a list... this is a little goofy:
list(islice(fib(), X))
when what was wanted is:
list = fib(X)
You can have both with the following:
def fib(max=None):
a = b = 1
while max is None or a <= max:
yield a
a, b = b, a+b
from itertools import islice
flist = list(islice(fib(), 100000))
flist2 = list(fib(100000))
or - if even the latter is unwanted -
def fibgen(max=None):
a = b = 1
while max is None or a <= max:
yield a
a, b = b, a+b
def fib(max=None, num=None):
if num is None:
return list(fibgen(max=max))
else:
from itertools import islice
return list(islice(fib(max=max), num))
Thomas
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