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Add descriptions of {}.iteritems(), {}.iterkeys(), and {}.itervalues() 

in the table of mapping object operations.  Re-numbered the list of
notes to reflect the move of the "Added in version 2.2." note to the list
of notes instead of being inserted into the last column of the table.
This commit is contained in:
Fred Drake 2001-05-25 04:24:37 +00:00
parent 50cf706b5c
commit c6d8f8d2ac
1 changed files with 23 additions and 12 deletions
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35
Doc/lib/libstdtypes.tex
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@ -923,29 +923,38 @@ arbitrary objects):
{}
\lineiii{\var{k} \code{in} \var{a}}
{Equivalent to \var{a}.has_key(\var{k})}
{\versionadded{2.2}}
{(2)}
\lineiii{\var{k} not in \var{a}}
{Equivalent to \code{not} \var{a}.has_key(\var{k})}
{\versionadded{2.2}}
{(2)}
\lineiii{\var{a}.items()}
{a copy of \var{a}'s list of (\var{key}, \var{value}) pairs}
{(2)}
{(3)}
\lineiii{\var{a}.keys()}{a copy of \var{a}'s list of keys}{(2)}
\lineiii{\var{a}.update(\var{b})}
{\code{for k in \var{b}.keys(): \var{a}[k] = \var{b}[k]}}
{(3)}
{(4)}
\lineiii{\var{a}.values()}{a copy of \var{a}'s list of values}{(2)}
\lineiii{\var{a}.get(\var{k}\optional{, \var{x}})}
{\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}},
else \var{x}}
{(4)}
{(5)}
\lineiii{\var{a}.setdefault(\var{k}\optional{, \var{x}})}
{\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}},
else \var{x} (also setting it)}
{(5)}
{(6)}
\lineiii{\var{a}.popitem()}
{remove and return an arbitrary (\var{key}, \var{value}) pair}
{(6)}
{(7)}
\lineiii{\var{a}.iteritems()}
{return an iterator over (\var{key}, \var{value}) pairs}
{(2)}
\lineiii{\var{a}.iterkeys()}
{return an iterator over the mapping's keys}
{(2)}
\lineiii{\var{a}.itervalues()}
{return an iterator over the mapping's values}
{(2)}
\end{tableiii}
\noindent
@ -954,24 +963,26 @@ Notes:
\item[(1)] Raises a \exception{KeyError} exception if \var{k} is not
in the map.
\item[(2)] Keys and values are listed in random order. If
\item[(2)] \versionadded{2.2}
\item[(3)] Keys and values are listed in random order. If
\method{keys()} and \method{values()} are called with no intervening
modifications to the dictionary, the two lists will directly
correspond. This allows the creation of \code{(\var{value},
\var{key})} pairs using \function{map()}: \samp{pairs = map(None,
\var{a}.values(), \var{a}.keys())}.
\item[(3)] \var{b} must be of the same type as \var{a}.
\item[(4)] \var{b} must be of the same type as \var{a}.
\item[(4)] Never raises an exception if \var{k} is not in the map,
\item[(5)] Never raises an exception if \var{k} is not in the map,
instead it returns \var{x}. \var{x} is optional; when \var{x} is not
provided and \var{k} is not in the map, \code{None} is returned.
\item[(5)] \function{setdefault()} is like \function{get()}, except
\item[(6)] \function{setdefault()} is like \function{get()}, except
that if \var{k} is missing, \var{x} is both returned and inserted into
the dictionary as the value of \var{k}.
\item[(6)] \function{popitem()} is useful to destructively iterate
\item[(7)] \function{popitem()} is useful to destructively iterate
over a dictionary, as often used in set algorithms.
\end{description}