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author | Andrew M. Kuchling <amk@amk.ca> | 2003-11-13 21:33:26 (GMT) |
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committer | Andrew M. Kuchling <amk@amk.ca> | 2003-11-13 21:33:26 (GMT) |
commit | 981a91857515d66c4faf60c0f63a9de0d770d217 (patch) | |
tree | 990eaa08b4f2256f01695c678383c401a90ea909 /Doc | |
parent | b845ef056ac33e2d65556cb7924d2084f89d2e0c (diff) | |
download | cpython-981a91857515d66c4faf60c0f63a9de0d770d217.zip cpython-981a91857515d66c4faf60c0f63a9de0d770d217.tar.gz cpython-981a91857515d66c4faf60c0f63a9de0d770d217.tar.bz2 |
Various edits
Diffstat (limited to 'Doc')
-rw-r--r-- | Doc/whatsnew/whatsnew24.tex | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/Doc/whatsnew/whatsnew24.tex b/Doc/whatsnew/whatsnew24.tex index 646a35c..4e2a9d8 100644 --- a/Doc/whatsnew/whatsnew24.tex +++ b/Doc/whatsnew/whatsnew24.tex @@ -104,8 +104,8 @@ using a \var{key} parameter. Using \var{key} results in calling the \method{lower()} method once for each element in the list while using \var{cmp} will call the method twice for each comparison. -Note, for simple key functions and comparison functions, it is often -possible to avoid the \keyword{lambda} expression by using an unbound +For simple key functions and comparison functions, it is often +possible to avoid a \keyword{lambda} expression by using an unbound method instead. For example, the above case-insensitive sort is best coded as: @@ -120,10 +120,11 @@ The \var{reverse} parameter should have a Boolean value. If the value is of \code{L.sort(lambda x,y: cmp(y.score, x.score))}, you can now write: \code{L.sort(key = lambda x: x.score, reverse=True)}. -The results of sorting are now guaranteed to be stable. This means that -two entries with equal keys will be returned in the same order as -they were input. - +The results of sorting are now guaranteed to be stable. This means +that two entries with equal keys will be returned in the same order as +they were input. For example, you can sort a list of people by name, +and then sort the list by age, resulting in a list sorted by age where +people with the same age are in name-sorted order. \item The list type gained a \method{sorted(iterable)} method that works like the in-place \method{sort()} method but has been made suitable for @@ -143,6 +144,7 @@ use in expressions. The differences are: >>> list.sorted('Monte Python') # any iterable may be an input [' ', 'M', 'P', 'e', 'h', 'n', 'n', 'o', 'o', 't', 't', 'y'] >>> colormap = dict(red=1, blue=2, green=3, black=4, yellow=5) +>>> # Lists the contents of the dict sorted by key values >>> for k, v in list.sorted(colormap.iteritems()): ... print k, v ... @@ -293,6 +295,6 @@ changes to your code: The author would like to thank the following people for offering suggestions, corrections and assistance with various drafts of this -article: . +article: Raymond Hettinger. \end{document} |