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| author | Raymond Hettinger <python@rcn.com> | 2003-10-13 17:52:35 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2003-10-13 17:52:35 (GMT) |
| commit | c2a2832bee2d30119981d7924223823b3f099662 (patch) | |
| tree | e928bec1015c5257788398c119c19111e4d21c18 | |
| parent | 7decf5e5af035dd15b62aa5894c0c95657fae5ee (diff) | |
| download | cpython-c2a2832bee2d30119981d7924223823b3f099662.zip cpython-c2a2832bee2d30119981d7924223823b3f099662.tar.gz cpython-c2a2832bee2d30119981d7924223823b3f099662.tar.bz2 | |
SF bug #821701: reduce docs neglect a very important piece of information.
Add a note showing which argument is the accumulator.
| -rw-r--r-- | Doc/lib/libfuncs.tex | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex index 936a023..a9f3a65 100644 --- a/Doc/lib/libfuncs.tex +++ b/Doc/lib/libfuncs.tex @@ -816,7 +816,9 @@ class C(object): Apply \var{function} of two arguments cumulatively to the items of \var{sequence}, from left to right, so as to reduce the sequence to a single value. For example, \code{reduce(lambda x, y: x+y, [1, 2, - 3, 4, 5])} calculates \code{((((1+2)+3)+4)+5)}. If the optional + 3, 4, 5])} calculates \code{((((1+2)+3)+4)+5)}. The left argument, + \var{x}, is the accumulated value and the right argument, \var{y}, + is the update value from the \var{sequence}. If the optional \var{initializer} is present, it is placed before the items of the sequence in the calculation, and serves as a default when the sequence is empty. If \var{initializer} is not given and |