Re: [Python-Dev] PEP 3142: Add a "while" clause to generator expressions

[Tino Wildenhain]

Nick Coghlan wrote:

Tino Wildenhain wrote:

g=(i for i in xrange(1000))[2:5]
g.next() # wrapper would now step 2 times w/o yield and 1 with yield

2

g.next()

3

g.next()

4

g.next()

Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
StopIteration

as expected - this could be included into itertools for now.

Slicing of arbitrary iterators has been supported by itertools ever
since the module was first added to the standard library.

from itertools import islice
g = islice((i for i in xrange(1000)), 2, 5)
list(g)

[2, 3, 4]

Yeah right, I actually believed it is already there but didn't
bother to check ;-)

Thx
Tino

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