Python calendar module : yeardayscalendar() method

Introduction

In the realm of Python programming, the calendar module serves as a flexible toolkit for overseeing date and time operations. Inside this module, the yeardayscalendar() strategy discreetly sparkles as a particular jewel. Not at all like conventional calendar functions, this strategy presents a new viewpoint by organizing days into weeks, advertising an elective way to comprehend the entry of time. In this article, we dive into the profundities of the yeardayscalendar() strategy, revealing its focal points, applications, and the special experiences it offers when managing calendars from a week-by-week perspective.

Exploring the Module `yeardayscalendar()` Method?

The Python calendar module, known for its capability in handling worldly information, is the yeardayscalendar() strategy. This strategy presents an offbeat however smart way to associate with calendars by moving the accentuation from months to weeks. In a world where calendars are synonymous with month to month frameworks, this strategy opens a special portal to see time.

At its center, the yeardayscalendar() strategy produces a year's calendar as a list of week-based lattices. Each lattice typifies the days of a month, disseminated over weeks. This elective course of action is especially valuable when managing time-based information that follows to week by week designs. One might compare it to seeing a mosaic of weeks shaping a bigger transient picture.

The weekday numbers are 0-6 for Monday through Sunday. It assumes Monday as the start of the week by default (ISO 8601).

Syntax

The syntax is −

calendar.yeardayscalendar(year, yeardayslist(optional))

yeardayscalendar() handles the complexities of aligning month calendars, locating the beginning and end of weeks, determining month lengths, etc. internally. The returned 3D matrix provides a convenient data structure for accessing and rendering the year's calendar. The modular structure allows easy access to month, week, and day data as needed.

Parameters and Return Value

The parameters to yeardayscalendar() are −

• year − The year as a four digit int

• yeardayslist − List of weekday numbers for each day of the year

It returns a 3D matrix with the yearly calendar representation. The outer lists represent months, middle lists represent weeks, and inner lists represent weekdays

Example 1

import calendar

year = 2023

cal_obj = calendar.Calendar()

year_layout = cal_obj.yeardayscalendar(year,2)

for quarter in year_layout:
   for month_group in quarter:
      # Print the quarter layout
      print(month_group)

Output

[[0, 0, 0, 0, 0, 0, 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, 31, 0, 0, 0, 0, 0]]
[[0, 0, 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, 0, 0, 0, 0, 0]]
[[0, 0, 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, 31, 0, 0]]
[[0, 0, 0, 0, 0, 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]]
[[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, 31, 0, 0, 0, 0]]
[[0, 0, 0, 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, 0, 0]]
[[0, 0, 0, 0, 0, 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], [31, 0, 0, 0, 0, 0, 0]]
[[0, 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, 31, 0, 0, 0]]
[[0, 0, 0, 0, 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, 0]]
[[0, 0, 0, 0, 0, 0, 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, 31, 0, 0, 0, 0, 0]]
[[0, 0, 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, 0, 0, 0]]
[[0, 0, 0, 0, 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, 31]]

Example 2

import calendar

year = 2023

cal_obj = calendar.Calendar()

year_layout = cal_obj.yeardayscalendar(year)

for quarter_idx, quarter in enumerate(year_layout, start=1):
   print(f"Quarter {quarter_idx}")
   for month_group in quarter:
      for week in month_group:
         week_str = ""
         for day in week:
            if day == 0:
               week_str += "   "  # Print spaces for days that belong to adjacent months
            else:
               week_str += f"{day:2} "
         print(week_str)
      print()

Output

Quarter 1
                   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 31                

       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                

       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 31       

Quarter 2
                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 

 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 31             

          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       

Quarter 3
                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 
31                   

    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 31          

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    

Quarter 4
                   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 31                

       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          

             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 31 

Conclusion

The yeardayscalendar() method in Python's calendar module converts the weekday numbers for a given year into a 3D matrix representing the entire year's calendar. This provides a convenient data structure for accessing, processing, and rendering yearly calendars in various applications. By encapsulating calendar alignment logic internally, yeardayscalendar() simplifies working with annual calendars programmatically in Python. It serves as a useful tool for calendar generation and date calculations needing structured year calendar data.