Create datetime.py

python/datetime.py

@@ -0,0 +1,102 @@
+'''
+object
+    timedelta
+    tzinfo
+        timezone
+    time
+    date
+        datetime
+'''
+import builtins
+
+MINYEAR = 1
+
+MAXYEAR = 9999
+
+MONTH_DAYS = [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+
+def is_leap(year):
+    return (year % 4 == 0 and year % 100 != 0) or year % 400 == 0
+
+class timedelta:
+    def __init__(self, days=0, seconds=0, microseconds=0,
+                 milliseconds=0, minutes=0, hours=0, weeks=0):
+        days += 7 * weeks
+        seconds += 60 * minutes + 3600 * hours
+        microseconds += 1000 * milliseconds #微秒 = 1000*毫秒
+
+        if microseconds >= 1000000:
+            seconds += microseconds // 1000000
+            microseconds %= 1000000
+        if seconds >= 3600 * 24:
+            days += seconds // (3600 * 24)
+            seconds %= (3600 * 24)
+        if builtins.abs(days) > 999999999:
+            raise OverflowError('timedelta # of days is Overflow')
+
+        self.days = days
+        self.second = seconds
+        self.microseconds = microseconds
+
+    def __str__(self):
+        s = 'datetime.timedelta(days=' + str(self.days) + ', '
+        s += 'seconds=' + str(self.second) + ', '
+        s += 'microseconds=' + str(self.microseconds) + ')'
+        return s
+
+    def __add__(self, other):
+        if isinstance(other, timedelta):
+            return timedelta(days = self.days + other.days,
+                             seconds = self.second + other.second,
+                             microseconds = self.microseconds + other.microseconds)
+        return NotImplemented
+
+    def __sub__(self, other):
+        if isinstance(other, timedelta):
+            return timedelta(days = self.days - other.days,
+                             seconds = self.second - other.second,
+                             microseconds = self.microseconds - other.microseconds)
+        return NotImplemented
+    def __neg__(self):
+        return timedelta(days = -self.days,
+                         seconds = -self.second,
+                         microseconds= -self.microseconds)
+    def __pos__(self):
+        return self
+
+    def __abs__(self):
+        if self._days < 0:
+            return -self
+        else:
+            return self
+
+class tzinfo:
+    pass
+
+class timezone(tzinfo):
+    pass
+
+class time:
+    pass
+
+class date:
+    def __init__(self, year=None, month=None, day=None):
+        if year < MINYEAR or year > MAXYEAR:
+            raise ValueError('year must be in [1, 9999]')
+        if month < 1 or month > 12:
+            raise ValueError('month must be in [1, 12]')
+        _max_day = MONTH_DAYS[month]
+        if month == 2 and is_leap(year):
+            _max_day += 1
+        if day < 1 or day > _max_day:
+            raise ValueError('day must be in [1, ', MONTH_DAYS[month], ']')
+
+        self.year = year
+        self.month = month
+        self.day = day
+
+    def today(self):
+        pass
+
+class datetime(date):
+    pass