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Add a note explaining that multiplying a sequence with a negative

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number is the same as multiplying it with zero, and yields an empty
sequence.
This commit is contained in:
Guido van Rossum 1998-01-27 19:09:43 +00:00
parent 516f18993f
commit 7570669a08
2 changed files with 10 additions and 2 deletions
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6
Doc/lib/libtypes.tex
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@ -330,7 +330,7 @@ equal to \var{x}, else \code{1}}{}
\hline
\lineiii{\var{s} + \var{t}}{the concatenation of \var{s} and \var{t}}{}
\hline
\lineiii{\var{s} * \var{n}{\rm ,} \var{n} * \var{s}}{\var{n} copies of \var{s} concatenated}{}
\lineiii{\var{s} * \var{n}{\rm ,} \var{n} * \var{s}}{\var{n} copies of \var{s} concatenated}{(3)}
\hline
\lineiii{\var{s}[\var{i}]}{\var{i}'th item of \var{s}, origin 0}{(1)}
\lineiii{\var{s}[\var{i}:\var{j}]}{slice of \var{s} from \var{i} to \var{j}}{(1), (2)}
@ -367,6 +367,10 @@ Notes:
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.
\item[(3)] Values of \var{n} less than \code{0} are treated as
\code{0} (which yields an empty sequence of the same type as
\var{s}).
\end{description}
\subsubsection{More String Operations}

6
Doc/libtypes.tex
View file

@ -330,7 +330,7 @@ equal to \var{x}, else \code{1}}{}
\hline
\lineiii{\var{s} + \var{t}}{the concatenation of \var{s} and \var{t}}{}
\hline
\lineiii{\var{s} * \var{n}{\rm ,} \var{n} * \var{s}}{\var{n} copies of \var{s} concatenated}{}
\lineiii{\var{s} * \var{n}{\rm ,} \var{n} * \var{s}}{\var{n} copies of \var{s} concatenated}{(3)}
\hline
\lineiii{\var{s}[\var{i}]}{\var{i}'th item of \var{s}, origin 0}{(1)}
\lineiii{\var{s}[\var{i}:\var{j}]}{slice of \var{s} from \var{i} to \var{j}}{(1), (2)}
@ -367,6 +367,10 @@ Notes:
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.
\item[(3)] Values of \var{n} less than \code{0} are treated as
\code{0} (which yields an empty sequence of the same type as
\var{s}).
\end{description}
\subsubsection{More String Operations}