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| author | Georg Brandl <georg@python.org> | 2006-02-19 00:12:42 (GMT) |
|---|---|---|
| committer | Georg Brandl <georg@python.org> | 2006-02-19 00:12:42 (GMT) |
| commit | 1dc5a84aee510f966849d32263466a6ec9c3da0c (patch) | |
| tree | bfd88ad0b44bc10d10fca6ba8aa300dd11d11509 | |
| parent | b2699b242d46312be13e7093ecf59ff949a190f7 (diff) | |
| download | cpython-1dc5a84aee510f966849d32263466a6ec9c3da0c.zip cpython-1dc5a84aee510f966849d32263466a6ec9c3da0c.tar.gz cpython-1dc5a84aee510f966849d32263466a6ec9c3da0c.tar.bz2 | |
Bug #801349: document that start/stop/step slice arguments can be None
| -rw-r--r-- | Doc/lib/libstdtypes.tex | 11 | ||||
| -rw-r--r-- | Python/ceval.c | 2 |
2 files changed, 7 insertions, 6 deletions
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex index c2a7c88..5df39db 100644 --- a/Doc/lib/libstdtypes.tex +++ b/Doc/lib/libstdtypes.tex @@ -532,9 +532,10 @@ In Python 2.3 and beyond, \var{x} may be a string of any length. \item[(4)] The slice of \var{s} from \var{i} to \var{j} is defined as the sequence of items with index \var{k} such that \code{\var{i} <= \var{k} < \var{j}}. If \var{i} or \var{j} is greater than - \code{len(\var{s})}, use \code{len(\var{s})}. If \var{i} is omitted, - use \code{0}. If \var{j} is omitted, use \code{len(\var{s})}. If - \var{i} is greater than or equal to \var{j}, the slice is empty. + \code{len(\var{s})}, use \code{len(\var{s})}. If \var{i} is omitted + or \code{None}, use \code{0}. If \var{j} is omitted or \code{None}, + use \code{len(\var{s})}. If \var{i} is greater than or equal to \var{j}, + the slice is empty. \item[(5)] The slice of \var{s} from \var{i} to \var{j} with step \var{k} is defined as the sequence of items with index @@ -543,9 +544,9 @@ In Python 2.3 and beyond, \var{x} may be a string of any length. are \code{i}, \code{i+k}, \code{i+2*k}, \code{i+3*k} and so on, stopping when \var{j} is reached (but never including \var{j}). If \var{i} or \var{j} is greater than \code{len(\var{s})}, use \code{len(\var{s})}. If - \var{i} or \var{j} are omitted then they become ``end'' values + \var{i} or \var{j} are omitted or \code{None}, they become ``end'' values (which end depends on the sign of \var{k}). Note, \var{k} cannot - be zero. + be zero. If \var{k} is \code{None}, it is treated like \code{1}. \item[(6)] If \var{s} and \var{t} are both strings, some Python implementations such as CPython can usually perform an in-place optimization diff --git a/Python/ceval.c b/Python/ceval.c index 131f5a7..c371f28 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -3905,7 +3905,7 @@ _PyEval_SliceIndex(PyObject *v, Py_ssize_t *pi) } } else { PyErr_SetString(PyExc_TypeError, - "slice indices must be integers"); + "slice indices must be integers or None"); return 0; } *pi = x; |