How to use the Python calendar module

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Python offers a built-in calendar module that lets you manipulate the code for specific days or months of the year. You can use it to generate a string of all calendar months in a year, for example.

Here’s how to get started with Python‘s calendar class and create a DIY calendar with it.

How to get started with the Calendar module

The calendar module is easy to use. And since it’s a built-in Python module, you don’t need to install it separately.

To get started, open your Python file and import the calendar module:

import calendar

See the days of the week

Starting with Monday, the module’s default week start day, you can display the days of the week in abbreviated form using the week header () function.

The week header () module function, however, accepts a width argument. This is an integer that specifies the number or length of the short string:

import calendar
print(calendar.weekheader(2)) # set the abbreviation length to 2
Output: Mo Tu We Th Fr Sa Su

The module sets the first day of the week to Monday by default. You can change this to Sunday using the setfirstweekday () function of calendar module.

Now try to put the first day of the week back to Sunday. Then reprint the week headers as you did above:

import calendar
# set the first day of the week to Sunday:
calendar.setfirstweekday(calendar.SUNDAY)
print(calendar.weekheader(3)) # set the abbreviation length to 3
Output: Sun Mon Tue Wed Thu Fri Sat

See if a year is a jump or not

Python allows you to check whether a year is a jump or not when you invoke the Isle() function of calendar to classify.

The function, however, accepts a year argument (2023 as in the code below) and returns Boolean output:

import calendar
print(calendar.isleap(2023))
Output: False

Check the number of leap days between specific year ranges

You use the leap days () to check the number of leap days between specific year ranges.

For example, to check the number of leap days between 2021 and 2030:

import calendar
checkleap = calendar.leapdays(2022, 2030)
print("There are {} leap days between 2022 and 2030".format(checkleap))
Output: There are 2 leap days between 2022 and 2030

Related: How Does the Python String Format () Method Work?

Check the first day of the week in a month

The module returns a list index of the days of a week. In essence, Monday, the first day of the week by default, equals zero, while Tuesday is one, in that order, through Sunday, the last day of the week, which is the sixth index.

You can confirm this by printing the first day of the week by default using the first day of the week () method of calendar to classify:

import calendar
print(calendar.firstweekday())
Output: 0

Using this preview, let’s check the first day of September 2020 using the day of the week() function:

import calender
print(calendar.weekday(2021, 9, 1)) # This accepts a year, a month, and a date argument
Output: 2

After the default index, 2, here means that the first day of September 2020 is a Wednesday.

Related: How Arrays and Lists Work in Python

You can also check the first day of the month and see the number of days in that month.

To do this, use month interval ():

import calendar
print(calendar.monthrange(2021, 9))
Output: (2, 30)

Pull out a monthly calendar

To see the calendar for a month, use the month() according to the calendar class. In addition to the year and month of interest, it accepts the optional width (w) and length (I) arguments.

These arguments are optional. Thus, the module sets them to zero by default even if you do not specify them.

Here’s how to print the monthly calendar using the month() method of this class:

import calendar
print(calendar.month(theyear = 2021, themonth = 9, w = 4, l = 2))

It looks like this:

Monthly calendar exit

Exit a calendar year

Ultimately, you can edit the entire calendar year using the calendar module function:

import calendar
print(calendar.calendar(2022, w=2, l=1, c=2, m=6))

Here’s what the output looks like:

Release of the annual calendar

While w controls the width and I control the length between each string, vs and m specify the number of rows and columns respectively. Feel free to change the values ​​of these parameters to see what happens.

That’s it! You have just created a calendar using Python. If you are curious, you can also consult the calendar module documentation to learn more about its different methods and features.

Train more with the Python calendar module

We’ve only covered the basic concepts of the calendar module in this article. There is more than this article could cover. The module, for example, offers decorators and HTML and CSS widgets to style your calendar and present it in HTML format. In addition, it has comprehensive documentation. So feel free to play with it as you see fit. Good coding!


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