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Explain what [].insert() does when the target index is negative.

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Fred Drake 2001-10-26 18:57:14 +00:00
parent d5be3b75dd
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18
Doc/lib/libstdtypes.tex
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@ -839,15 +839,15 @@ The following operations are defined on mutable sequence types (where
{return smallest \var{i} such that \code{\var{s}[\var{i}] == \var{x}}}{(3)} {return smallest \var{i} such that \code{\var{s}[\var{i}] == \var{x}}}{(3)}
\lineiii{\var{s}.insert(\var{i}, \var{x})} \lineiii{\var{s}.insert(\var{i}, \var{x})}
{same as \code{\var{s}[\var{i}:\var{i}] = [\var{x}]} {same as \code{\var{s}[\var{i}:\var{i}] = [\var{x}]}
if \code{\var{i} >= 0}}{} if \code{\var{i} >= 0}}{(4)}
\lineiii{\var{s}.pop(\optional{\var{i}})} \lineiii{\var{s}.pop(\optional{\var{i}})}
{same as \code{\var{x} = \var{s}[\var{i}]; del \var{s}[\var{i}]; return \var{x}}}{(4)} {same as \code{\var{x} = \var{s}[\var{i}]; del \var{s}[\var{i}]; return \var{x}}}{(5)}
\lineiii{\var{s}.remove(\var{x})} \lineiii{\var{s}.remove(\var{x})}
{same as \code{del \var{s}[\var{s}.index(\var{x})]}}{(3)} {same as \code{del \var{s}[\var{s}.index(\var{x})]}}{(3)}
\lineiii{\var{s}.reverse()} \lineiii{\var{s}.reverse()}
{reverses the items of \var{s} in place}{(5)} {reverses the items of \var{s} in place}{(6)}
\lineiii{\var{s}.sort(\optional{\var{cmpfunc}})} \lineiii{\var{s}.sort(\optional{\var{cmpfunc}})}
{sort the items of \var{s} in place}{(5), (6)} {sort the items of \var{s} in place}{(6), (7)}
\end{tableiii} \end{tableiii}
\indexiv{operations on}{mutable}{sequence}{types} \indexiv{operations on}{mutable}{sequence}{types}
\indexiii{operations on}{sequence}{types} \indexiii{operations on}{sequence}{types}
@ -874,16 +874,20 @@ Notes:
\item[(3)] Raises \exception{ValueError} when \var{x} is not found in \item[(3)] Raises \exception{ValueError} when \var{x} is not found in
\var{s}. \var{s}.
\item[(4)] The \method{pop()} method is only supported by the list and \item[(4)] When a negative index is passed as the first parameter to
the \method{insert()} method, the new element is prepended to the
sequence.
\item[(5)] The \method{pop()} method is only supported by the list and
array types. The optional argument \var{i} defaults to \code{-1}, array types. The optional argument \var{i} defaults to \code{-1},
so that by default the last item is removed and returned. so that by default the last item is removed and returned.
\item[(5)] The \method{sort()} and \method{reverse()} methods modify the \item[(6)] The \method{sort()} and \method{reverse()} methods modify the
list in place for economy of space when sorting or reversing a large list in place for economy of space when sorting or reversing a large
list. To remind you that they operate by side effect, they don't return list. To remind you that they operate by side effect, they don't return
the sorted or reversed list. the sorted or reversed list.
\item[(6)] The \method{sort()} method takes an optional argument \item[(7)] The \method{sort()} method takes an optional argument
specifying a comparison function of two arguments (list items) which specifying a comparison function of two arguments (list items) which
should return a negative, zero or positive number depending on whether should return a negative, zero or positive number depending on whether
the first argument is considered smaller than, equal to, or larger the first argument is considered smaller than, equal to, or larger