Initial data commit

Task/Five-weekends/Python/five-weekends-1.py

@@ -0,0 +1,38 @@
+from datetime import (date,
+                      timedelta)
+
+DAY = timedelta(days=1)
+START, STOP = date(1900, 1, 1), date(2101, 1, 1)
+WEEKEND = {6, 5, 4}  # Sunday is day 6
+FMT = '%Y %m(%B)'
+
+
+def five_weekends_per_month(start: date = START,
+                            stop: date = STOP) -> list[date]:
+    """Compute months with five weekends between dates"""
+    current_date = start
+    last_month = weekend_days = 0
+    five_weekends = []
+    while current_date < stop:
+        if current_date.month != last_month:
+            if weekend_days >= 15:
+                five_weekends.append(current_date - DAY)
+            weekend_days = 0
+            last_month = current_date.month
+        if current_date.weekday() in WEEKEND:
+            weekend_days += 1
+        current_date += DAY
+    return five_weekends
+
+
+dates = five_weekends_per_month()
+indent = '  '
+print(f"There are {len(dates)} months of which the first and last five are:")
+print(indent + ('\n' + indent).join(d.strftime(FMT) for d in dates[:5]))
+print(indent + '...')
+print(indent + ('\n' + indent).join(d.strftime(FMT) for d in dates[-5:]))
+
+years_without_five_weekends_months = (STOP.year - START.year
+                                      - len({d.year for d in dates}))
+print(f"\nThere are {years_without_five_weekends_months} years in the "
+      f"range that do not have months with five weekends")

Task/Five-weekends/Python/five-weekends-2.py

@@ -0,0 +1,12 @@
+LONGMONTHS = (1, 3, 5, 7, 8, 10, 12)  # Jan Mar May Jul Aug Oct Dec
+
+
+def five_weekends_per_month2(start: date = START,
+                             stop: date = STOP) -> list[date]:
+    return [last_day
+            for year in range(start.year, stop.year)
+            for month in LONG_MONTHS
+            if (last_day := date(year, month, 31)).weekday() == 6]  # Sunday
+
+dates2 = five_weekends_per_month2()
+assert dates2 == dates