This code calculates and formats the start and end dates...

This code calculates and formats the start and end dates of the week before the current week (the previous calendar week). Here's a step-by-step breakdown:

1. today = datetime.now().date()
   Gets the current date (in YYYY-MM-DD format) using datetime.now().date().

2. cal_last_week_start = today - timedelta(days=today.weekday()+7)
   Calculates the start date of the previous calendar week:

   • today.weekday() gives the day of the week as a number (Monday is 0, Sunday is 6).
   • Adding 7 gives the number of days since the Monday of the previous week.
   • Subtracting this from today gives the date of the Monday of the previous week.

3. last_week_start = cal_last_week_start - timedelta(days=1)
   Adjusts the start of the week to one day earlier, making it "Sunday of the week before last."

4. last_week_end = last_week_start + timedelta(days=6)
   Calculates the end date of the previous week by adding 6 days to the new start date.

5. start_date_str = last_week_start.strftime('%Y-%m-%d')
   Converts the start date of the previous week (last_week_start) into a string in the format YYYY-MM-DD.

6. end_date_str = last_week_end.strftime('%Y-%m-%d')
   Converts the end date of the previous week (last_week_end) into a string in the same format as above.

Final Output

• start_date_str is the Sunday of the previous week (formatted as YYYY-MM-DD).
• end_date_str is the Saturday of the previous week (formatted as YYYY-MM-DD).