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Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/lib/libitertools.tex | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Doc/lib/libitertools.tex b/Doc/lib/libitertools.tex index 59fbd98..ac6028b 100644 --- a/Doc/lib/libitertools.tex +++ b/Doc/lib/libitertools.tex @@ -302,6 +302,33 @@ by functions or loops that truncate the stream. don't care about trailing, unmatched values from the longer iterables. \end{funcdesc} +\begin{funcdesc}{izip_longest}{*iterables\optional{, fillvalue}} + Make an iterator that aggregates elements from each of the iterables. + If the iterables are of uneven length, missing values are filled-in + with \var{fillvalue}. Iteration continues until the longest iterable + is exhausted. Equivalent to: + + \begin{verbatim} + def izip_longest(*args, **kwds): + fillvalue = kwds.get('fillvalue') + def sentinel(counter = ([fillvalue]*(len(args)-1)).pop): + yield counter() # yields the fillvalue, or raises IndexError + fillers = repeat(fillvalue) + iters = [chain(it, sentinel(), fillers) for it in args] + try: + for tup in izip(*iters): + yield tup + except IndexError: + pass + \end{verbatim} + + If one of the iterables is potentially infinite, then the + \function{izip_longest()} function should be wrapped with something + that limits the number of calls (for example \function{islice()} or + \function{take()}). + \versionadded{2.6} +\end{funcdesc} + \begin{funcdesc}{repeat}{object\optional{, times}} Make an iterator that returns \var{object} over and over again. Runs indefinitely unless the \var{times} argument is specified. |