From 6005a344ce9938256e0e8bb986ebad29c449f3c6 Mon Sep 17 00:00:00 2001 From: Raymond Hettinger Date: Mon, 30 Dec 2002 20:01:24 +0000 Subject: Added markup upto line 233. --- Doc/lib/libdatetime.tex | 115 ++++++++++++++++++++++++------------------------ 1 file changed, 57 insertions(+), 58 deletions(-) diff --git a/Doc/lib/libdatetime.tex b/Doc/lib/libdatetime.tex index 79653ba..f09bda7 100644 --- a/Doc/lib/libdatetime.tex +++ b/Doc/lib/libdatetime.tex @@ -8,6 +8,9 @@ \moduleauthor{Tim Peters}{tim@zope.com} \sectionauthor{Tim Peters}{tim@zope.com} \sectionauthor{A.M. Kuchling}{amk@amk.ca} +\sectionauthor{Raymond D. Hettinger}{python@rcn.com} + +\versionadded{2.3} \newcommand{\Naive}{Na\"ive} \newcommand{\naive}{na\"ive} @@ -50,6 +53,10 @@ The \module{datetime} module exports the following constants: or \class{datetimetz} object. \constant{MAXYEAR} is \code{9999}. \end{datadesc} +\begin{seealso} + \seemodule{calendar}{General calandar related functions.} + \seemodule{time}{Time access and conversions.} +\end{seealso} \subsection{Available Types} @@ -125,24 +132,25 @@ object datetimetz \end{verbatim} -\subsection{\class{timedelta} \label{datetime-timedelta}} +\subsection{\class{timedelta} Objects \label{datetime-timedelta}} +\begin{classdesc}{timedelta}{days=0, seconds=0, microseconds=0, + milliseconds=0, minutes=0, hours=0, weeks=0} A \class{timedelta} object represents a duration, the difference between two dates or times. -\begin{funcdesc}{timedelta}{days=0, seconds=0, microseconds=0, - milliseconds=0, minutes=0, hours=0, weeks=0} - All arguments are optional. Arguments may be ints, longs, or floats, and may be positive or negative. - Only days, seconds and microseconds are stored internally. Arguments - are converted to those units: + Only \var{days}, \var{seconds} and \var{microseconds} are stored + internally. Arguments are converted to those units: +\begin{verbatim} A millisecond is converted to 1000 microseconds. A minute is converted to 60 seconds. An hour is converted to 3600 seconds. A week is converted to 7 days. +\end{verbatim} and days, seconds and microseconds are then normalized so that the representation is unique, with @@ -171,69 +179,60 @@ between two dates or times. (-1, 86399, 999999) \end{verbatim} -\end{funcdesc} +\end{classdesc} Class attributes are: -\begin{memberdesc}{min} - The most negative \class{timedelta} object, \code{timedelta(-999999999)}. -\end{memberdesc} - -\begin{memberdesc}{max} - The most positive \class{timedelta} object, +\begin{tableii}{c|l}{code}{Attribute}{Value} + \lineii{min}{The most negative \class{timedelta} object, + \code{timedelta(-999999999)}} + \lineii{max}{The most positive \class{timedelta} object, timedelta(days=999999999, hours=23, minutes=59, seconds=59, - microseconds=999999) -\end{memberdesc} - -\begin{memberdesc}{resolution} - The smallest possible difference between non-equal timedelta - objects, \code{timedelta(microseconds=1)}. -\end{memberdesc} + microseconds=999999)} + \lineii{resolution}{The smallest possible difference between non-equal + \class{timedelta} objects, \code{timedelta(microseconds=1)}} +\end{tableii} Note that, because of normalization, timedelta.max > -timedelta.min. -timedelta.max is not representable as a \class{timedelta} object. Instance attributes (read-only): -\begin{memberdesc}{days} -Between -999999999 and 999999999 inclusive. -\end{memberdesc} -\begin{memberdesc}{seconds} -Between 0 and 86399 inclusive. -\end{memberdesc} -\begin{memberdesc}{microseconds} -Between 0 and 999999 inclusive. -\end{memberdesc} +\begin{tableii}{c|l}{code}{Attribute}{Value} + \lineii{days}{Between -999999999 and 999999999 inclusive} + \lineii{seconds}{Between 0 and 86399 inclusive} + \lineii{microseconds}{Between 0 and 999999 inclusive} +\end{tableii} Supported operations: -\begin{itemize} - \item - timedelta + timedelta -> timedelta - This is exact, but may overflow. After - t1 = t2 + t3 - t1-t2 == t3 and t1-t3 == t2 are true. +\begin{tableiii}{c|l|c}{code}{Operation}{Result}{Notes} + \lineii{t1 = t2 + t3}{Sum of t2 and t3. + Afterwards t1-t2 == t3 and t1-t3 == t2 are true.}{(1)} + \lineii{t1 = t2 - t3}{Difference of t2 and t3. Afterwards t1 = t2 - t3 and + t2 == t1 + t3 are true.}{(1)} + \lineii{t1 = t2 * i or t1 = i * t2}{Delta multiplied by an integer or long. + Afterwards t1 // i == t2 is true, provided i != 0. + In general, t1 * i == t1 * (i-1) + t1 is true.}{(1)} + \lineii{t1 = t2 // i}{The floor is computed and the remainder (if any) is + thrown away.}{(2)} + +\end{tableii} +\noindent +Notes: - \item - timedelta - timedelta -> timedelta - This is exact, but may overflow. After - t1 = t2 - t3 - t2 == t1 + t3 is true. +\begin{description} +\item[(1)] +This is exact, but may overflow. - \item - timedelta * (int or long) -> timedelta - (int or long) * timedelta -> timedelta - This is exact, but may overflow. After - t1 = t2 * i - t1 // i == t2 is true, provided i != 0. In general, - t * i == t * (i-1) + t - is true. +\item[(2)] +Division by 0 raises \exception{ZeroDivisionError}. +\end{description} - \item - timedelta // (int or long) -> timedelta - The floor is computed and the remainder (if any) is thrown away. - Division by 0 raises \exception{ZeroDivisionError}. + + +\begin{itemize} \item certain additions and subtractions with date, datetime, and datimetz objects (see below) @@ -269,7 +268,7 @@ Supported operations: \end{itemize} -\subsection{\class{date} \label{datetime-date}} +\subsection{\class{date} Objects \label{datetime-date}} A \class{date} object represents a date (year, month and day) in an idealized calendar, the current Gregorian calendar indefinitely extended in both @@ -471,7 +470,7 @@ Instance methods: \end{methoddesc} -\subsection{\class{datetime} \label{datetime-datetime}} +\subsection{\class{datetime} Objects \label{datetime-datetime}} A \class{datetime} object is a single object containing all the information from a \class{date} object and a time object. Like a @@ -737,7 +736,7 @@ Instance methods: \end{methoddesc} -\subsection{\class{time} \label{datetime-time}} +\subsection{\class{time} Objects \label{datetime-time}} A time object represents an idealized time of day, independent of day and timezone. @@ -831,7 +830,7 @@ Instance methods: \end{methoddesc} -\subsection{\class{tzinfo} \label{datetime-tzinfo}} +\subsection{\class{tzinfo} Objects \label{datetime-tzinfo}} \class{tzinfo} is an abstract base clase, meaning that this class should not be instantiated directly. You need to derive a concrete @@ -905,7 +904,7 @@ Example \class{tzinfo} classes: \verbatiminput{tzinfo-examples.py} -\subsection{\class{timetz} \label{datetime-timetz}} +\subsection{\class{timetz} Objects \label{datetime-timetz}} A time object represents a (local) time of day, independent of any particular day, and subject to adjustment via a \class{tzinfo} object. @@ -1032,7 +1031,7 @@ Instance methods: -\subsection{ \class{datetimetz} \label{datetime-datetimetz}} +\subsection{ \class{datetimetz} Objects \label{datetime-datetimetz}} \begin{notice}[warning] I think this is \emph{still} missing some methods from the -- cgit v0.12