diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/library/itertools.rst | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index 240baf0..4dfc083 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -200,20 +200,23 @@ loops that truncate the stream. .. versionadded:: 2.7 -.. function:: count([n]) +.. function:: count(n=0, step=1) - Make an iterator that returns consecutive integers starting with *n*. If not - specified *n* defaults to zero. Often used as an argument to :func:`imap` to - generate consecutive data points. Also, used with :func:`izip` to add sequence - numbers. Equivalent to:: + Make an iterator that returns evenly spaced values starting with *n*. Often + used as an argument to :func:`imap` to generate consecutive data points. + Also, used with :func:`izip` to add sequence numbers. Equivalent to:: - def count(n=0): + def count(n=0, step=1): # count(10) --> 10 11 12 13 14 ... + # count(2.5, 0.5) -> 3.5 3.0 4.5 ... while True: yield n - n += 1 + n += step + .. versionchanged:: 2.7 + added *step* argument and allowed non-integer arguments. + .. function:: cycle(iterable) Make an iterator returning elements from the iterable and saving a copy of each. |