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   1 """Collecting Day and date-related items."""
   2 from datetime import datetime
   3 from plomtask.misc import HandledException
   4
   5 DATE_FORMAT = '%Y-%m-%d'
   6
   7
   8 def date_valid(date: str):
   9     """Validate date against DATE_FORMAT, return Datetime or None."""
  10     try:
  11         result = datetime.strptime(date, DATE_FORMAT)
  12     except (ValueError, TypeError):
  13         return None
  14     return result
  15
  16
  17 class Day:
  18     """Individual days defined by their dates."""
  19
  20     def __init__(self, date: str):
  21         self.date = date
  22         self.datetime = date_valid(self.date)
  23         if not self.datetime:
  24             raise HandledException(f'Given date of wrong format: {self.date}')
  25
  26     @property
  27     def weekday(self):
  28         """Return what weekday matches self.date."""
  29         return self.datetime.strftime('%A')
  30
  31     def __eq__(self, other: object):
  32         return isinstance(other, self.__class__) and self.date == other.date
  33
  34     def __lt__(self, other):
  35         return self.date < other.date