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Python calendar module | setfirstweekday() method

  • Last Updated : 22 Oct, 2018

Calendar module allows to output calendars like program, and provides additional useful functions related to the calendar. Functions and classes defined in Calendar module use an idealized calendar, the current Gregorian calendar extended indefinitely in both directions.

In Python, calendar.setfirstweekday(weekday) is a function provided in calendar module for simple text calendars.

setfirstweekday() method sets the weekday (0 is Monday, 6 is Sunday) to start each week. The values MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, and SUNDAY are provided for convenience.
For example, to set the first weekday to Sunday.

Syntax: setfirstweekday()
Parameter: no parameter
Returns: None

Code #1:

# Python program to explain working of setfirstweekday() method
# importing calendar module
import calendar
# calling setfirstweekday() function
val = calendar.setfirstweekday(calendar.SUNDAY)
# returns None



Code #2: Explaining working of setfirstweekday() method with prmonth() method

# Python code to demonstrate the working of 
# setfirstweekday() with prmonth() method
# importing calendar module for calendar operations 
import calendar 
# using prmonth() to print calendar of 1997 
print ("The 4th month of 1997 is : "
calendar.prmonth(1997, 4, 2, 1
# using setfirstweekday() to set first week day number 
print ("\r"
# using firstweekday() to check the changed day 
print ("The new week day number is : ", end ="") 
print (calendar.firstweekday()) 


The 4th month of 1997 is : 
     April 1997
Mo Tu We Th Fr Sa Su
    1  2  3  4  5  6
 7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30
The new week day number is : 4

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