Step arg without a start arg was ignored.

Issue 5176: special-case string formatting in BINARY_MODULO implementation. This shows a modest (1-3%) speed-up in templating systems, for example.

Issue #5247: Improve error message when unknown format codes are used when using str.format() with str, unicode, long, int, and float arguments.

documentation.

Add some cross-references to the docs.  Simplify the python code equivalent for izip().  Supply an optional argument for the nth() recipe.

for issue5293.

The file was resized to wrong size.

Add versionadded tags.