mirror of https://github.com/python/cpython
665 lines
21 KiB
ReStructuredText
665 lines
21 KiB
ReStructuredText
:mod:`!calendar` --- General calendar-related functions
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=======================================================
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.. module:: calendar
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:synopsis: Functions for working with calendars, including some emulation
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of the Unix cal program.
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.. sectionauthor:: Drew Csillag <drew_csillag@geocities.com>
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**Source code:** :source:`Lib/calendar.py`
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--------------
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This module allows you to output calendars like the Unix :program:`cal` program,
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and provides additional useful functions related to the calendar. By default,
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these calendars have Monday as the first day of the week, and Sunday as the last
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(the European convention). Use :func:`setfirstweekday` to set the first day of
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the week to Sunday (6) or to any other weekday. Parameters that specify dates
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are given as integers. For related
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functionality, see also the :mod:`datetime` and :mod:`time` modules.
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The functions and classes defined in this module
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use an idealized calendar, the current Gregorian calendar extended indefinitely
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in both directions. This matches the definition of the "proleptic Gregorian"
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calendar in Dershowitz and Reingold's book "Calendrical Calculations", where
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it's the base calendar for all computations. Zero and negative years are
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interpreted as prescribed by the ISO 8601 standard. Year 0 is 1 BC, year -1 is
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2 BC, and so on.
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.. class:: Calendar(firstweekday=0)
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Creates a :class:`Calendar` object. *firstweekday* is an integer specifying the
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first day of the week. :const:`MONDAY` is ``0`` (the default), :const:`SUNDAY` is ``6``.
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A :class:`Calendar` object provides several methods that can be used for
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preparing the calendar data for formatting. This class doesn't do any formatting
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itself. This is the job of subclasses.
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:class:`Calendar` instances have the following methods:
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.. method:: iterweekdays()
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Return an iterator for the week day numbers that will be used for one
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week. The first value from the iterator will be the same as the value of
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the :attr:`firstweekday` property.
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.. method:: itermonthdates(year, month)
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Return an iterator for the month *month* (1--12) in the year *year*. This
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iterator will return all days (as :class:`datetime.date` objects) for the
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month and all days before the start of the month or after the end of the
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month that are required to get a complete week.
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.. method:: itermonthdays(year, month)
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Return an iterator for the month *month* in the year *year* similar to
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:meth:`itermonthdates`, but not restricted by the :class:`datetime.date`
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range. Days returned will simply be day of the month numbers. For the
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days outside of the specified month, the day number is ``0``.
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.. method:: itermonthdays2(year, month)
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Return an iterator for the month *month* in the year *year* similar to
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:meth:`itermonthdates`, but not restricted by the :class:`datetime.date`
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range. Days returned will be tuples consisting of a day of the month
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number and a week day number.
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.. method:: itermonthdays3(year, month)
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Return an iterator for the month *month* in the year *year* similar to
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:meth:`itermonthdates`, but not restricted by the :class:`datetime.date`
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range. Days returned will be tuples consisting of a year, a month and a day
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of the month numbers.
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.. versionadded:: 3.7
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.. method:: itermonthdays4(year, month)
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Return an iterator for the month *month* in the year *year* similar to
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:meth:`itermonthdates`, but not restricted by the :class:`datetime.date`
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range. Days returned will be tuples consisting of a year, a month, a day
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of the month, and a day of the week numbers.
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.. versionadded:: 3.7
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.. method:: monthdatescalendar(year, month)
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Return a list of the weeks in the month *month* of the *year* as full
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weeks. Weeks are lists of seven :class:`datetime.date` objects.
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.. method:: monthdays2calendar(year, month)
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Return a list of the weeks in the month *month* of the *year* as full
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weeks. Weeks are lists of seven tuples of day numbers and weekday
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numbers.
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.. method:: monthdayscalendar(year, month)
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Return a list of the weeks in the month *month* of the *year* as full
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weeks. Weeks are lists of seven day numbers.
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.. method:: yeardatescalendar(year, width=3)
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Return the data for the specified year ready for formatting. The return
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value is a list of month rows. Each month row contains up to *width*
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months (defaulting to 3). Each month contains between 4 and 6 weeks and
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each week contains 1--7 days. Days are :class:`datetime.date` objects.
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.. method:: yeardays2calendar(year, width=3)
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Return the data for the specified year ready for formatting (similar to
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:meth:`yeardatescalendar`). Entries in the week lists are tuples of day
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numbers and weekday numbers. Day numbers outside this month are zero.
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.. method:: yeardayscalendar(year, width=3)
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Return the data for the specified year ready for formatting (similar to
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:meth:`yeardatescalendar`). Entries in the week lists are day numbers. Day
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numbers outside this month are zero.
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.. class:: TextCalendar(firstweekday=0)
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This class can be used to generate plain text calendars.
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:class:`TextCalendar` instances have the following methods:
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.. method:: formatmonth(theyear, themonth, w=0, l=0)
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Return a month's calendar in a multi-line string. If *w* is provided, it
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specifies the width of the date columns, which are centered. If *l* is
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given, it specifies the number of lines that each week will use. Depends
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on the first weekday as specified in the constructor or set by the
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:meth:`setfirstweekday` method.
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.. method:: prmonth(theyear, themonth, w=0, l=0)
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Print a month's calendar as returned by :meth:`formatmonth`.
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.. method:: formatyear(theyear, w=2, l=1, c=6, m=3)
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Return a *m*-column calendar for an entire year as a multi-line string.
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Optional parameters *w*, *l*, and *c* are for date column width, lines per
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week, and number of spaces between month columns, respectively. Depends on
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the first weekday as specified in the constructor or set by the
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:meth:`setfirstweekday` method. The earliest year for which a calendar
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can be generated is platform-dependent.
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.. method:: pryear(theyear, w=2, l=1, c=6, m=3)
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Print the calendar for an entire year as returned by :meth:`formatyear`.
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.. class:: HTMLCalendar(firstweekday=0)
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This class can be used to generate HTML calendars.
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:class:`!HTMLCalendar` instances have the following methods:
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.. method:: formatmonth(theyear, themonth, withyear=True)
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Return a month's calendar as an HTML table. If *withyear* is true the year
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will be included in the header, otherwise just the month name will be
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used.
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.. method:: formatyear(theyear, width=3)
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Return a year's calendar as an HTML table. *width* (defaulting to 3)
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specifies the number of months per row.
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.. method:: formatyearpage(theyear, width=3, css='calendar.css', encoding=None)
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Return a year's calendar as a complete HTML page. *width* (defaulting to
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3) specifies the number of months per row. *css* is the name for the
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cascading style sheet to be used. :const:`None` can be passed if no style
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sheet should be used. *encoding* specifies the encoding to be used for the
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output (defaulting to the system default encoding).
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.. method:: formatmonthname(theyear, themonth, withyear=True)
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Return a month name as an HTML table row. If *withyear* is true the year
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will be included in the row, otherwise just the month name will be
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used.
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:class:`!HTMLCalendar` has the following attributes you can override to
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customize the CSS classes used by the calendar:
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.. attribute:: cssclasses
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A list of CSS classes used for each weekday. The default class list is::
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cssclasses = ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]
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more styles can be added for each day::
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cssclasses = ["mon text-bold", "tue", "wed", "thu", "fri", "sat", "sun red"]
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Note that the length of this list must be seven items.
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.. attribute:: cssclass_noday
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The CSS class for a weekday occurring in the previous or coming month.
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.. versionadded:: 3.7
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.. attribute:: cssclasses_weekday_head
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A list of CSS classes used for weekday names in the header row.
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The default is the same as :attr:`cssclasses`.
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.. versionadded:: 3.7
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.. attribute:: cssclass_month_head
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The month's head CSS class (used by :meth:`formatmonthname`).
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The default value is ``"month"``.
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.. versionadded:: 3.7
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.. attribute:: cssclass_month
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The CSS class for the whole month's table (used by :meth:`formatmonth`).
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The default value is ``"month"``.
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.. versionadded:: 3.7
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.. attribute:: cssclass_year
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The CSS class for the whole year's table of tables (used by
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:meth:`formatyear`). The default value is ``"year"``.
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.. versionadded:: 3.7
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.. attribute:: cssclass_year_head
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The CSS class for the table head for the whole year (used by
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:meth:`formatyear`). The default value is ``"year"``.
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.. versionadded:: 3.7
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Note that although the naming for the above described class attributes is
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singular (e.g. ``cssclass_month`` ``cssclass_noday``), one can replace the
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single CSS class with a space separated list of CSS classes, for example::
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"text-bold text-red"
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Here is an example how :class:`!HTMLCalendar` can be customized::
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class CustomHTMLCal(calendar.HTMLCalendar):
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cssclasses = [style + " text-nowrap" for style in
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calendar.HTMLCalendar.cssclasses]
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cssclass_month_head = "text-center month-head"
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cssclass_month = "text-center month"
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cssclass_year = "text-italic lead"
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.. class:: LocaleTextCalendar(firstweekday=0, locale=None)
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This subclass of :class:`TextCalendar` can be passed a locale name in the
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constructor and will return month and weekday names in the specified locale.
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.. class:: LocaleHTMLCalendar(firstweekday=0, locale=None)
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This subclass of :class:`HTMLCalendar` can be passed a locale name in the
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constructor and will return month and weekday names in the specified
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locale.
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.. note::
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The constructor, :meth:`!formatweekday` and :meth:`!formatmonthname` methods
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of these two classes temporarily change the ``LC_TIME`` locale to the given
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*locale*. Because the current locale is a process-wide setting, they are
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not thread-safe.
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For simple text calendars this module provides the following functions.
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.. function:: setfirstweekday(weekday)
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Sets the weekday (``0`` is Monday, ``6`` is Sunday) to start each week. The
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values :const:`MONDAY`, :const:`TUESDAY`, :const:`WEDNESDAY`, :const:`THURSDAY`,
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:const:`FRIDAY`, :const:`SATURDAY`, and :const:`SUNDAY` are provided for
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convenience. For example, to set the first weekday to Sunday::
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import calendar
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calendar.setfirstweekday(calendar.SUNDAY)
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.. function:: firstweekday()
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Returns the current setting for the weekday to start each week.
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.. function:: isleap(year)
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Returns :const:`True` if *year* is a leap year, otherwise :const:`False`.
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.. function:: leapdays(y1, y2)
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Returns the number of leap years in the range from *y1* to *y2* (exclusive),
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where *y1* and *y2* are years.
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This function works for ranges spanning a century change.
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.. function:: weekday(year, month, day)
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Returns the day of the week (``0`` is Monday) for *year* (``1970``--...),
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*month* (``1``--``12``), *day* (``1``--``31``).
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.. function:: weekheader(n)
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Return a header containing abbreviated weekday names. *n* specifies the width in
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characters for one weekday.
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.. function:: monthrange(year, month)
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Returns weekday of first day of the month and number of days in month, for the
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specified *year* and *month*.
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.. function:: monthcalendar(year, month)
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Returns a matrix representing a month's calendar. Each row represents a week;
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days outside of the month are represented by zeros. Each week begins with Monday
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unless set by :func:`setfirstweekday`.
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.. function:: prmonth(theyear, themonth, w=0, l=0)
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Prints a month's calendar as returned by :func:`month`.
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.. function:: month(theyear, themonth, w=0, l=0)
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Returns a month's calendar in a multi-line string using the :meth:`~TextCalendar.formatmonth`
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of the :class:`TextCalendar` class.
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.. function:: prcal(year, w=0, l=0, c=6, m=3)
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Prints the calendar for an entire year as returned by :func:`calendar`.
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.. function:: calendar(year, w=2, l=1, c=6, m=3)
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Returns a 3-column calendar for an entire year as a multi-line string using
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the :meth:`~TextCalendar.formatyear` of the :class:`TextCalendar` class.
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.. function:: timegm(tuple)
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An unrelated but handy function that takes a time tuple such as returned by
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the :func:`~time.gmtime` function in the :mod:`time` module, and returns the
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corresponding Unix timestamp value, assuming an epoch of 1970, and the POSIX
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encoding. In fact, :func:`time.gmtime` and :func:`timegm` are each others'
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inverse.
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The :mod:`calendar` module exports the following data attributes:
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.. data:: day_name
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A sequence that represents the days of the week in the current locale,
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where Monday is day number 0.
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>>> import calendar
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>>> list(calendar.day_name)
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['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
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.. data:: day_abbr
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A sequence that represents the abbreviated days of the week in the current locale,
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where Mon is day number 0.
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>>> import calendar
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>>> list(calendar.day_abbr)
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['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
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.. data:: MONDAY
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TUESDAY
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WEDNESDAY
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THURSDAY
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FRIDAY
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SATURDAY
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SUNDAY
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Aliases for the days of the week,
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where ``MONDAY`` is ``0`` and ``SUNDAY`` is ``6``.
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.. versionadded:: 3.12
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.. class:: Day
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Enumeration defining days of the week as integer constants.
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The members of this enumeration are exported to the module scope as
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:data:`MONDAY` through :data:`SUNDAY`.
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.. versionadded:: 3.12
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.. data:: month_name
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A sequence that represents the months of the year in the current locale. This
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follows normal convention of January being month number 1, so it has a length of
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13 and ``month_name[0]`` is the empty string.
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>>> import calendar
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>>> list(calendar.month_name)
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['', 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
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.. data:: month_abbr
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A sequence that represents the abbreviated months of the year in the current
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locale. This follows normal convention of January being month number 1, so it
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has a length of 13 and ``month_abbr[0]`` is the empty string.
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>>> import calendar
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>>> list(calendar.month_abbr)
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['', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
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.. data:: JANUARY
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FEBRUARY
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MARCH
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APRIL
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MAY
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JUNE
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JULY
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AUGUST
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SEPTEMBER
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OCTOBER
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NOVEMBER
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DECEMBER
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Aliases for the months of the year,
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where ``JANUARY`` is ``1`` and ``DECEMBER`` is ``12``.
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.. versionadded:: 3.12
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.. class:: Month
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Enumeration defining months of the year as integer constants.
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The members of this enumeration are exported to the module scope as
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:data:`JANUARY` through :data:`DECEMBER`.
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.. versionadded:: 3.12
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The :mod:`calendar` module defines the following exceptions:
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.. exception:: IllegalMonthError(month)
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A subclass of :exc:`ValueError`,
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raised when the given month number is outside of the range 1-12 (inclusive).
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.. attribute:: month
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The invalid month number.
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.. exception:: IllegalWeekdayError(weekday)
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A subclass of :exc:`ValueError`,
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raised when the given weekday number is outside of the range 0-6 (inclusive).
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.. attribute:: weekday
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The invalid weekday number.
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.. seealso::
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Module :mod:`datetime`
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Object-oriented interface to dates and times with similar functionality to the
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:mod:`time` module.
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Module :mod:`time`
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Low-level time related functions.
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.. _calendar-cli:
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Command-Line Usage
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------------------
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.. versionadded:: 2.5
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The :mod:`calendar` module can be executed as a script from the command line
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to interactively print a calendar.
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.. code-block:: shell
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python -m calendar [-h] [-L LOCALE] [-e ENCODING] [-t {text,html}]
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[-w WIDTH] [-l LINES] [-s SPACING] [-m MONTHS] [-c CSS]
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[-f FIRST_WEEKDAY] [year] [month]
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For example, to print a calendar for the year 2000:
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.. code-block:: console
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$ python -m calendar 2000
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2000
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January February March
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Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
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1 2 1 2 3 4 5 6 1 2 3 4 5
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3 4 5 6 7 8 9 7 8 9 10 11 12 13 6 7 8 9 10 11 12
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10 11 12 13 14 15 16 14 15 16 17 18 19 20 13 14 15 16 17 18 19
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17 18 19 20 21 22 23 21 22 23 24 25 26 27 20 21 22 23 24 25 26
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24 25 26 27 28 29 30 28 29 27 28 29 30 31
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31
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April May June
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Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
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1 2 1 2 3 4 5 6 7 1 2 3 4
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3 4 5 6 7 8 9 8 9 10 11 12 13 14 5 6 7 8 9 10 11
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10 11 12 13 14 15 16 15 16 17 18 19 20 21 12 13 14 15 16 17 18
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17 18 19 20 21 22 23 22 23 24 25 26 27 28 19 20 21 22 23 24 25
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24 25 26 27 28 29 30 29 30 31 26 27 28 29 30
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July August September
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Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
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1 2 1 2 3 4 5 6 1 2 3
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3 4 5 6 7 8 9 7 8 9 10 11 12 13 4 5 6 7 8 9 10
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10 11 12 13 14 15 16 14 15 16 17 18 19 20 11 12 13 14 15 16 17
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17 18 19 20 21 22 23 21 22 23 24 25 26 27 18 19 20 21 22 23 24
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24 25 26 27 28 29 30 28 29 30 31 25 26 27 28 29 30
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31
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October November December
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Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
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1 1 2 3 4 5 1 2 3
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2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10
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9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17
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16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24
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23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31
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30 31
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The following options are accepted:
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.. program:: calendar
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.. option:: --help, -h
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Show the help message and exit.
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.. option:: --locale LOCALE, -L LOCALE
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The locale to use for month and weekday names.
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Defaults to English.
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.. option:: --encoding ENCODING, -e ENCODING
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The encoding to use for output.
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:option:`--encoding` is required if :option:`--locale` is set.
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.. option:: --type {text,html}, -t {text,html}
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Print the calendar to the terminal as text,
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or as an HTML document.
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.. option:: --first-weekday FIRST_WEEKDAY, -f FIRST_WEEKDAY
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The weekday to start each week.
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Must be a number between 0 (Monday) and 6 (Sunday).
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Defaults to 0.
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.. versionadded:: 3.13
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.. option:: year
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The year to print the calendar for.
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Defaults to the current year.
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.. option:: month
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The month of the specified :option:`year` to print the calendar for.
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Must be a number between 1 and 12,
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and may only be used in text mode.
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Defaults to printing a calendar for the full year.
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*Text-mode options:*
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.. option:: --width WIDTH, -w WIDTH
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The width of the date column in terminal columns.
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The date is printed centred in the column.
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Any value lower than 2 is ignored.
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Defaults to 2.
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.. option:: --lines LINES, -l LINES
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The number of lines for each week in terminal rows.
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The date is printed top-aligned.
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Any value lower than 1 is ignored.
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Defaults to 1.
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.. option:: --spacing SPACING, -s SPACING
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The space between months in columns.
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Any value lower than 2 is ignored.
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Defaults to 6.
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.. option:: --months MONTHS, -m MONTHS
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The number of months printed per row.
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Defaults to 3.
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*HTML-mode options:*
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.. option:: --css CSS, -c CSS
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The path of a CSS stylesheet to use for the calendar.
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This must either be relative to the generated HTML,
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or an absolute HTTP or ``file:///`` URL.
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