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Issue #1446619: Account for negative slice direction in description 

Based on suggestion from Fumihiro Bessho.
This commit is contained in:
Martin Panter 2016-12-24 08:25:15 +00:00
parent 3310e146cc
commit 3dbd87f2b9
1 changed files with 4 additions and 2 deletions
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Doc/library/stdtypes.rst
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@ -942,8 +942,10 @@ Notes:
The slice of *s* from *i* to *j* with step *k* is defined as the sequence of
items with index ``x = i + n*k`` such that ``0 <= n < (j-i)/k``. In other words,
the indices are ``i``, ``i+k``, ``i+2*k``, ``i+3*k`` and so on, stopping when
*j* is reached (but never including *j*). If *i* or *j* is greater than
``len(s)``, use ``len(s)``. If *i* or *j* are omitted or ``None``, they become
*j* is reached (but never including *j*). When *k* is positive,
*i* and *j* are reduced to ``len(s)`` if they are greater.
When *k* is negative, *i* and *j* are reduced to ``len(s) - 1`` if
they are greater. If *i* or *j* are omitted or ``None``, they become
"end" values (which end depends on the sign of *k*). Note, *k* cannot be zero.
If *k* is ``None``, it is treated like ``1``.