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Update documentation to include the new functions, and use the more 

explicitly-named bisect_right() in the example code.

This closes SF bug #127055.
This commit is contained in:
Fred Drake 2001-01-04 05:12:52 +00:00
parent 9c15fa7a0f
commit 2a72712efe
1 changed files with 40 additions and 13 deletions
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53
Doc/lib/libbisect.tex
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@ -19,18 +19,45 @@ algorithm (i.e., the boundary conditions are already right!).
The following functions are provided:
\begin{funcdesc}{bisect}{list, item\optional{, lo\optional{, hi}}}
Locate the proper insertion point for \var{item} in \var{list} to
maintain sorted order. The parameters \var{lo} and \var{hi} may be
used to specify a subset of the list which should be considered. The
return value is suitable for use as the first parameter to
\code{\var{list}.insert()}.
\begin{funcdesc}{bisect_left}{list, item\optional{, lo\optional{, hi}}}
Locate the proper insertion point for \var{item} in \var{list} to
maintain sorted order. The parameters \var{lo} and \var{hi} may be
used to specify a subset of the list which should be considered; by
default the entire list is used. If \var{item} is already present
in \var{list}, the insertion point will be before (to the left of)
any existing entries. The return value is suitable for use as the
first parameter to \code{\var{list}.insert()}. This assumes that
\var{list} is already sorted.
\versionadded{2.1}
\end{funcdesc}
\begin{funcdesc}{insort}{list, item\optional{, lo\optional{, hi}}}
Insert \var{item} in \var{list} in sorted order. This is equivalent
to \code{\var{list}.insert(bisect.bisect(\var{list}, \var{item},
\var{lo}, \var{hi}), \var{item})}.
\begin{funcdesc}{bisect_right}{list, item\optional{, lo\optional{, hi}}}
Similar to \function{bisect_left()}, but returns an insertion point
which comes after (to the right of) any existing entries of
\var{item} in \var{list}.
\versionadded{2.1}
\end{funcdesc}
\begin{funcdesc}{bisect}{\unspecified}
Alias for \function{bisect_right()} for backward compatibility.
\end{funcdesc}
\begin{funcdesc}{insort_left}{list, item\optional{, lo\optional{, hi}}}
Insert \var{item} in \var{list} in sorted order. This is equivalent
to \code{\var{list}.insert(bisect.bisect_left(\var{list}, \var{item},
\var{lo}, \var{hi}), \var{item})}. This assumes that \var{list} is
already sorted.
\versionadded{2.1}
\end{funcdesc}
\begin{funcdesc}{insort_right}{list, item\optional{, lo\optional{, hi}}}
Similar to \function{insort_left()}, but inserting \var{item} in
\var{list} after any existing entries of \var{item}.
\versionadded{2.1}
\end{funcdesc}
\begin{funcdesc}{insort}{\unspecified}
Alias for \function{insort_right()} for backward compatibility.
\end{funcdesc}
@ -38,16 +65,16 @@ to \code{\var{list}.insert(bisect.bisect(\var{list}, \var{item},
\nodename{bisect-example}
The \function{bisect()} function is generally useful for categorizing
numeric data. This example uses \function{bisect()} to look up a
numeric data. This example uses \function{bisect_right()} to look up a
letter grade for an exam total (say) based on a set of ordered numeric
breakpoints: 85 and up is an `A', 75..84 is a `B', etc.
\begin{verbatim}
>>> grades = "FEDCBA"
>>> breakpoints = [30, 44, 66, 75, 85]
>>> from bisect import bisect
>>> from bisect import bisect_right
>>> def grade(total):
... return grades[bisect(breakpoints, total)]
... return grades[bisect_right(breakpoints, total)]
...
>>> grade(66)
'C'