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module. The code is shorter, more readable, faster, and dramatically increases the range of acceptable dates. Also, used the floor division operator in leapdays().
113 lines
4.3 KiB
TeX
113 lines
4.3 KiB
TeX
\section{\module{calendar} ---
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General calendar-related functions}
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\declaremodule{standard}{calendar}
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\modulesynopsis{Functions for working with calendars,
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including some emulation of the \UNIX\ \program{cal}
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program.}
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\sectionauthor{Drew Csillag}{drew_csillag@geocities.com}
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This module allows you to output calendars like the \UNIX{}
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\program{cal} program, and provides additional useful functions
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related to the calendar. By default, these calendars have Monday as
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the first day of the week, and Sunday as the last (the European
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convention). Use \function{setfirstweekday()} to set the first day of the
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week to Sunday (6) or to any other weekday. Parameters that specify
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dates are given as integers.
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Most of these functions rely on the \module{datetime} module which
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uses an idealized calendar, the current Gregorian calendar indefinitely
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extended in both directions. This matches the definition of the
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"proleptic Gregorian" calendar in Dershowitz and Reingold's book
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"Calendrical Calculations", where it's the base calendar for all
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computations.
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\begin{funcdesc}{setfirstweekday}{weekday}
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Sets the weekday (\code{0} is Monday, \code{6} is Sunday) to start
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each week. The values \constant{MONDAY}, \constant{TUESDAY},
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\constant{WEDNESDAY}, \constant{THURSDAY}, \constant{FRIDAY},
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\constant{SATURDAY}, and \constant{SUNDAY} are provided for
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convenience. For example, to set the first weekday to Sunday:
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\begin{verbatim}
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import calendar
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calendar.setfirstweekday(calendar.SUNDAY)
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\end{verbatim}
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\versionadded{2.0}
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\end{funcdesc}
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\begin{funcdesc}{firstweekday}{}
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Returns the current setting for the weekday to start each week.
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\versionadded{2.0}
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\end{funcdesc}
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\begin{funcdesc}{isleap}{year}
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Returns \code{1} if \var{year} is a leap year, otherwise \code{0}.
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\end{funcdesc}
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\begin{funcdesc}{leapdays}{y1, y2}
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Returns the number of leap years in the range
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[\var{y1}\ldots\var{y2}), where \var{y1} and \var{y2} are years.
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\versionchanged[This function didn't work for ranges spanning
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a century change in Python 1.5.2]{2.0}
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\end{funcdesc}
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\begin{funcdesc}{weekday}{year, month, day}
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Returns the day of the week (\code{0} is Monday) for \var{year}
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(\code{1970}--\ldots), \var{month} (\code{1}--\code{12}), \var{day}
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(\code{1}--\code{31}).
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\end{funcdesc}
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\begin{funcdesc}{monthrange}{year, month}
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Returns weekday of first day of the month and number of days in month,
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for the specified \var{year} and \var{month}.
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\end{funcdesc}
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\begin{funcdesc}{monthcalendar}{year, month}
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Returns a matrix representing a month's calendar. Each row represents
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a week; days outside of the month a represented by zeros.
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Each week begins with Monday unless set by \function{setfirstweekday()}.
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\end{funcdesc}
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\begin{funcdesc}{prmonth}{theyear, themonth\optional{, w\optional{, l}}}
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Prints a month's calendar as returned by \function{month()}.
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\end{funcdesc}
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\begin{funcdesc}{month}{theyear, themonth\optional{, w\optional{, l}}}
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Returns a month's calendar in a multi-line string. If \var{w} is
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provided, it specifies the width of the date columns, which are
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centered. If \var{l} is given, it specifies the number of lines that
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each week will use. Depends on the first weekday as set by
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\function{setfirstweekday()}.
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\versionadded{2.0}
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\end{funcdesc}
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\begin{funcdesc}{prcal}{year\optional{, w\optional{, l\optional{c}}}}
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Prints the calendar for an entire year as returned by
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\function{calendar()}.
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\end{funcdesc}
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\begin{funcdesc}{calendar}{year\optional{, w\optional{, l\optional{c}}}}
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Returns a 3-column calendar for an entire year as a multi-line string.
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Optional parameters \var{w}, \var{l}, and \var{c} are for date column
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width, lines per week, and number of spaces between month columns,
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respectively. Depends on the first weekday as set by
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\function{setfirstweekday()}. The earliest year for which a calendar can
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be generated is platform-dependent.
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\versionadded{2.0}
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\end{funcdesc}
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\begin{funcdesc}{timegm}{tuple}
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An unrelated but handy function that takes a time tuple such as
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returned by the \function{gmtime()} function in the \refmodule{time}
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module, and returns the corresponding \UNIX{} timestamp value, assuming
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an epoch of 1970, and the POSIX encoding. In fact,
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\function{time.gmtime()} and \function{timegm()} are each others' inverse.
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\versionadded{2.0}
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\end{funcdesc}
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\begin{seealso}
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\seemodule{time}{Low-level time related functions.}
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\end{seealso}
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