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.firstweekday() is a function provided in calendar module for simple text calendars. firstweekday() method is used to get the current setting for the weekday to start each week.

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

Code #1:

# Python program to explain working of firstweekday() method

# importing calendar module
import calendar

# default firstweekday
print("Default First weekday is - ", calendar.firstweekday())

# setting 2nd day as firstweekday
calendar.setfirstweekday(2)

# print firstweekday
print("First weekday after modification is - ", calendar.firstweekday())

Output:

Default First weekday is -  6
First weekday after modification is -  2

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

# Python code to demonstrate the working of 
# firstweekday() with help of 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 
calendar.setfirstweekday(4) 

print("First weekday after modification is - ",
                        calendar.firstweekday())

Output:

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
 First weekday after modification is -  4