68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import datetime
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class Term:
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"""A representation of a term in the CSC LDAP, e.g. 's2021'."""
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seasons = ['w', 's', 'f']
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def __init__(self, s_term: str):
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assert len(s_term) == 5 and s_term[0] in self.seasons and \
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s_term[1:].isdigit()
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self.s_term = s_term
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def __repr__(self):
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return self.s_term
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@staticmethod
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def current():
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"""Get a Term object for the current date."""
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dt = datetime.datetime.now()
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c = 'w'
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if 5 <= dt.month <= 8:
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c = 's'
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elif 9 <= dt.month:
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c = 'f'
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s_term = c + str(dt.year)
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return Term(s_term)
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def __add__(self, other):
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assert type(other) is int and other >= 0
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c = self.s_term[0]
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season_idx = self.seasons.index(c)
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year = int(self.s_term[1:])
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year += other // 3
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season_idx += other % 3
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if season_idx >= 3:
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year += 1
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season_idx -= 3
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s_term = self.seasons[season_idx] + str(year)
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return Term(s_term)
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def __eq__(self, other):
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return isinstance(other, Term) and self.s_term == other.s_term
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def __lt__(self, other):
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if not isinstance(other, Term):
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return NotImplemented
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c1, c2 = self.s_term[0], other.s_term[0]
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year1, year2 = int(self.s_term[1:]), int(other.s_term[1:])
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return year1 < year2 or (
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year1 == year2 and self.seasons.index(c1) < self.seasons.index(c2)
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)
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def __gt__(self, other):
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if not isinstance(other, Term):
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return NotImplemented
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c1, c2 = self.s_term[0], other.s_term[0]
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year1, year2 = int(self.s_term[1:]), int(other.s_term[1:])
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return year1 > year2 or (
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year1 == year2 and self.seasons.index(c1) > self.seasons.index(c2)
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)
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def __ge__(self, other):
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return self > other or self == other
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def __le__(self, other):
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return self < other or self == other
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