Python: Select all the Sundays of a specified year

Last update on December 21 2024 07:27:31 (UTC/GMT +8 hours)

Write a Python program to select all the Sundays in a specified year.

Sample Solution:

Python Code:

# Import the date class and the timedelta class from the datetime module
from datetime import date, timedelta

# Define a function named all_sundays that takes a year as input
def all_sundays(year):
    # Set dt to January 1st of the given year
    dt = date(year, 1, 1)
    # Move dt to the first Sunday of the given year
    dt += timedelta(days=6 - dt.weekday())  
    # Iterate through all Sundays of the given year
    while dt.year == year:
        # Yield the current date (dt) as a result
        yield dt
        # Move to the next Sunday by adding 7 days
        dt += timedelta(days=7)
          
# Iterate through all Sundays of the year 2020 using the all_sundays function
for s in all_sundays(2020):
    # Print each Sunday
    print(s)

Output:

2020-01-05                                                                                                    
2020-01-12                                                                                                    
2020-01-19                                                                                                    
2020-01-26                                                                                                    
2020-02-02     
-----
2020-12-06                                                                                                    
2020-12-13                                                                                                    
2020-12-20                                                                                                    
2020-12-27   

Explanation:

In the exercise above,

• The code imports the "date" class and the "timedelta" class from the "datetime" module.
• Define the function to find Sundays:
• The code defines a function named "all_sundays()" that takes a 'year' as input.
• Find the first Sunday of the year:
• It initializes a date 'dt' to January 1st of the given year (date(year, 1, 1)).
• It adjusts 'dt' to the first Sunday of the given year by adding a 'timedelta' representing the difference between the weekday of January 1st and Sunday (6 - dt.weekday()).
• Generating all Sundays of the year:
• It iterates through all Sundays of the given year using a while loop.
• In each iteration, it yields the current date 'dt'.
• Then, it moves 'dt' to the next Sunday by adding 7 days (dt += timedelta(days=7)).
• Printing all Sundays of the year 2020:
• It iterates through all Sundays of the year 2020 using a for loop with the "all_sundays(2020)" function call.
• In each iteration, it prints the Sunday date.

Flowchart:

Python Code Editor:

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