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Implement, test and document "key in dict" and "key not in dict".

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I know some people don't like this -- if it's really controversial,
I'll take it out again.  (If it's only Alex Martelli who doesn't like
it, that doesn't count as "real controversial" though. :-)

That's why this is a separate checkin from the iterators stuff I'm
about to check in next.
This commit is contained in:
Guido van Rossum 2001-04-20 16:50:40 +00:00
parent 78fe5308b4
commit 0dbb4fba4c
5 changed files with 59 additions and 8 deletions
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12
Doc/lib/libstdtypes.tex
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@ -867,9 +867,15 @@ arbitrary objects):
{(1)}
\lineiii{\var{a}.clear()}{remove all items from \code{a}}{}
\lineiii{\var{a}.copy()}{a (shallow) copy of \code{a}}{}
\lineiii{\var{a}.has_key(\var{k})}
\lineiii{\var{k} \code{in} \var{a}}
{\code{1} if \var{a} has a key \var{k}, else \code{0}}
{}
\lineiii{\var{k} not in \var{a}}
{\code{0} if \var{a} has a key \var{k}, else \code{1}}
{}
\lineiii{\var{a}.has_key(\var{k})}
{Equivalent to \var{k} \code{in} \var{a}}
{}
\lineiii{\var{a}.items()}
{a copy of \var{a}'s list of (\var{key}, \var{value}) pairs}
{(2)}
@ -879,11 +885,11 @@ arbitrary objects):
{(3)}
\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{a}.has_key(\var{k})},
{\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}}},
else \var{x}}
{(4)}
\lineiii{\var{a}.setdefault(\var{k}\optional{, \var{x}})}
{\code{\var{a}[\var{k}]} if \code{\var{a}.has_key(\var{k})},
{\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}}},
else \var{x} (also setting it)}
{(5)}
\lineiii{\var{a}.popitem()}