Issue 17862: Improve the signature of itertools grouper() recipe.

rhettinger · rhettinger · commit 44571daf0e3a · 2013-05-05T19:53:41.000-07:00
Putting *n* after the *iterable* matches the signature of other itertools
and recipes.  Also, it reads better.

Suggested by Ezio Melotti.
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
@@ -705,9 +705,9 @@ which incur interpreter overhead.
        next(b, None)
        return zip(a, b)
 
-   def grouper(n, iterable, fillvalue=None):
+   def grouper(iterable, n, fillvalue=None):
        "Collect data into fixed-length chunks or blocks"
-       # grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
+       # grouper('ABCDEFG', 3, 'x') --> ABC DEF Gxx"
        args = [iter(iterable)] * n
        return zip_longest(*args, fillvalue=fillvalue)
 
