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Edit File : relativedelta.py \| Size : 22.60 KB
# -- coding: utf-8 -- import datetime import calendar import operator from math import copysign from six import integer_types from warnings import warn from ._common import weekday MO, TU, WE, TH, FR, SA, SU = weekdays = tuple(weekday(x) for x in range(7)) __all__ = ["relativedelta", "MO", "TU", "WE", "TH", "FR", "SA", "SU"] class relativedelta(object): """ The relativedelta type is based on the specification of the excellent work done by M.-A. Lemburg in his `mx.DateTime <http://www.egenix.com/files/python/mxDateTime.html>`_ extension. However, notice that this type does NOT implement the same algorithm as his work. Do NOT expect it to behave like mx.DateTime's counterpart. There are two different ways to build a relativedelta instance. The first one is passing it two date/datetime classes:: relativedelta(datetime1, datetime2) The second one is passing it any number of the following keyword arguments:: relativedelta(arg1=x,arg2=y,arg3=z...) year, month, day, hour, minute, second, microsecond: Absolute information (argument is singular); adding or subtracting a relativedelta with absolute information does not perform an aritmetic operation, but rather REPLACES the corresponding value in the original datetime with the value(s) in relativedelta. years, months, weeks, days, hours, minutes, seconds, microseconds: Relative information, may be negative (argument is plural); adding or subtracting a relativedelta with relative information performs the corresponding aritmetic operation on the original datetime value with the information in the relativedelta. weekday: One of the weekday instances (MO, TU, etc). These instances may receive a parameter N, specifying the Nth weekday, which could be positive or negative (like MO(+1) or MO(-2). Not specifying it is the same as specifying +1. You can also use an integer, where 0=MO. leapdays: Will add given days to the date found, if year is a leap year, and the date found is post 28 of february. yearday, nlyearday: Set the yearday or the non-leap year day (jump leap days). These are converted to day/month/leapdays information. Here is the behavior of operations with relativedelta: 1. Calculate the absolute year, using the 'year' argument, or the original datetime year, if the argument is not present. 2. Add the relative 'years' argument to the absolute year. 3. Do steps 1 and 2 for month/months. 4. Calculate the absolute day, using the 'day' argument, or the original datetime day, if the argument is not present. Then, subtract from the day until it fits in the year and month found after their operations. 5. Add the relative 'days' argument to the absolute day. Notice that the 'weeks' argument is multiplied by 7 and added to 'days'. 6. Do steps 1 and 2 for hour/hours, minute/minutes, second/seconds, microsecond/microseconds. 7. If the 'weekday' argument is present, calculate the weekday, with the given (wday, nth) tuple. wday is the index of the weekday (0-6, 0=Mon), and nth is the number of weeks to add forward or backward, depending on its signal. Notice that if the calculated date is already Monday, for example, using (0, 1) or (0, -1) won't change the day. """ def __init__(self, dt1=None, dt2=None, years=0, months=0, days=0, leapdays=0, weeks=0, hours=0, minutes=0, seconds=0, microseconds=0, year=None, month=None, day=None, weekday=None, yearday=None, nlyearday=None, hour=None, minute=None, second=None, microsecond=None): # Check for non-integer values in integer-only quantities if any(x is not None and x != int(x) for x in (years, months)): raise ValueError("Non-integer years and months are " "ambiguous and not currently supported.") if dt1 and dt2: # datetime is a subclass of date. So both must be date if not (isinstance(dt1, datetime.date) and isinstance(dt2, datetime.date)): raise TypeError("relativedelta only diffs datetime/date") # We allow two dates, or two datetimes, so we coerce them to be # of the same type if (isinstance(dt1, datetime.datetime) != isinstance(dt2, datetime.datetime)): if not isinstance(dt1, datetime.datetime): dt1 = datetime.datetime.fromordinal(dt1.toordinal()) elif not isinstance(dt2, datetime.datetime): dt2 = datetime.datetime.fromordinal(dt2.toordinal()) self.years = 0 self.months = 0 self.days = 0 self.leapdays = 0 self.hours = 0 self.minutes = 0 self.seconds = 0 self.microseconds = 0 self.year = None self.month = None self.day = None self.weekday = None self.hour = None self.minute = None self.second = None self.microsecond = None self._has_time = 0 # Get year / month delta between the two months = (dt1.year - dt2.year) * 12 + (dt1.month - dt2.month) self._set_months(months) # Remove the year/month delta so the timedelta is just well-defined # time units (seconds, days and microseconds) dtm = self.__radd__(dt2) # If we've overshot our target, make an adjustment if dt1 < dt2: compare = operator.gt increment = 1 else: compare = operator.lt increment = -1 while compare(dt1, dtm): months += increment self._set_months(months) dtm = self.__radd__(dt2) # Get the timedelta between the "months-adjusted" date and dt1 delta = dt1 - dtm self.seconds = delta.seconds + delta.days * 86400 self.microseconds = delta.microseconds else: # Relative information self.years = years self.months = months self.days = days + weeks * 7 self.leapdays = leapdays self.hours = hours self.minutes = minutes self.seconds = seconds self.microseconds = microseconds # Absolute information self.year = year self.month = month self.day = day self.hour = hour self.minute = minute self.second = second self.microsecond = microsecond if any(x is not None and int(x) != x for x in (year, month, day, hour, minute, second, microsecond)): # For now we'll deprecate floats - later it'll be an error. warn("Non-integer value passed as absolute information. " + "This is not a well-defined condition and will raise " + "errors in future versions.", DeprecationWarning) if isinstance(weekday, integer_types): self.weekday = weekdays[weekday] else: self.weekday = weekday yday = 0 if nlyearday: yday = nlyearday elif yearday: yday = yearday if yearday > 59: self.leapdays = -1 if yday: ydayidx = [31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 366] for idx, ydays in enumerate(ydayidx): if yday <= ydays: self.month = idx+1 if idx == 0: self.day = yday else: self.day = yday-ydayidx[idx-1] break else: raise ValueError("invalid year day (%d)" % yday) self._fix() def _fix(self): if abs(self.microseconds) > 999999: s = _sign(self.microseconds) div, mod = divmod(self.microseconds * s, 1000000) self.microseconds = mod * s self.seconds += div * s if abs(self.seconds) > 59: s = _sign(self.seconds) div, mod = divmod(self.seconds * s, 60) self.seconds = mod * s self.minutes += div * s if abs(self.minutes) > 59: s = _sign(self.minutes) div, mod = divmod(self.minutes * s, 60) self.minutes = mod * s self.hours += div * s if abs(self.hours) > 23: s = _sign(self.hours) div, mod = divmod(self.hours * s, 24) self.hours = mod * s self.days += div * s if abs(self.months) > 11: s = _sign(self.months) div, mod = divmod(self.months * s, 12) self.months = mod * s self.years += div * s if (self.hours or self.minutes or self.seconds or self.microseconds or self.hour is not None or self.minute is not None or self.second is not None or self.microsecond is not None): self._has_time = 1 else: self._has_time = 0 @property def weeks(self): return self.days // 7 @weeks.setter def weeks(self, value): self.days = self.days - (self.weeks * 7) + value * 7 def _set_months(self, months): self.months = months if abs(self.months) > 11: s = _sign(self.months) div, mod = divmod(self.months * s, 12) self.months = mod * s self.years = div * s else: self.years = 0 def normalized(self): """ Return a version of this object represented entirely using integer values for the relative attributes. >>> relativedelta(days=1.5, hours=2).normalized() relativedelta(days=1, hours=14) :return: Returns a :class:`dateutil.relativedelta.relativedelta` object. """ # Cascade remainders down (rounding each to roughly nearest microsecond) days = int(self.days) hours_f = round(self.hours + 24 * (self.days - days), 11) hours = int(hours_f) minutes_f = round(self.minutes + 60 * (hours_f - hours), 10) minutes = int(minutes_f) seconds_f = round(self.seconds + 60 * (minutes_f - minutes), 8) seconds = int(seconds_f) microseconds = round(self.microseconds + 1e6 * (seconds_f - seconds)) # Constructor carries overflow back up with call to _fix() return self.__class__(years=self.years, months=self.months, days=days, hours=hours, minutes=minutes, seconds=seconds, microseconds=microseconds, leapdays=self.leapdays, year=self.year, month=self.month, day=self.day, weekday=self.weekday, hour=self.hour, minute=self.minute, second=self.second, microsecond=self.microsecond) def __add__(self, other): if isinstance(other, relativedelta): return self.__class__(years=other.years + self.years, months=other.months + self.months, days=other.days + self.days, hours=other.hours + self.hours, minutes=other.minutes + self.minutes, seconds=other.seconds + self.seconds, microseconds=(other.microseconds + self.microseconds), leapdays=other.leapdays or self.leapdays, year=(other.year if other.year is not None else self.year), month=(other.month if other.month is not None else self.month), day=(other.day if other.day is not None else self.day), weekday=(other.weekday if other.weekday is not None else self.weekday), hour=(other.hour if other.hour is not None else self.hour), minute=(other.minute if other.minute is not None else self.minute), second=(other.second if other.second is not None else self.second), microsecond=(other.microsecond if other.microsecond is not None else self.microsecond)) if isinstance(other, datetime.timedelta): return self.__class__(years=self.years, months=self.months, days=self.days + other.days, hours=self.hours, minutes=self.minutes, seconds=self.seconds + other.seconds, microseconds=self.microseconds + other.microseconds, leapdays=self.leapdays, year=self.year, month=self.month, day=self.day, weekday=self.weekday, hour=self.hour, minute=self.minute, second=self.second, microsecond=self.microsecond) if not isinstance(other, datetime.date): return NotImplemented elif self._has_time and not isinstance(other, datetime.datetime): other = datetime.datetime.fromordinal(other.toordinal()) year = (self.year or other.year)+self.years month = self.month or other.month if self.months: assert 1 <= abs(self.months) <= 12 month += self.months if month > 12: year += 1 month -= 12 elif month < 1: year -= 1 month += 12 day = min(calendar.monthrange(year, month)[1], self.day or other.day) repl = {"year": year, "month": month, "day": day} for attr in ["hour", "minute", "second", "microsecond"]: value = getattr(self, attr) if value is not None: repl[attr] = value days = self.days if self.leapdays and month > 2 and calendar.isleap(year): days += self.leapdays ret = (other.replace(*repl) + datetime.timedelta(days=days, hours=self.hours, minutes=self.minutes, seconds=self.seconds, microseconds=self.microseconds)) if self.weekday: weekday, nth = self.weekday.weekday, self.weekday.n or 1 jumpdays = (abs(nth) - 1) 7 if nth > 0: jumpdays += (7 - ret.weekday() + weekday) % 7 else: jumpdays += (ret.weekday() - weekday) % 7 jumpdays = -1 ret += datetime.timedelta(days=jumpdays) return ret def __radd__(self, other): return self.__add__(other) def __rsub__(self, other): return self.__neg__().__radd__(other) def __sub__(self, other): if not isinstance(other, relativedelta): return NotImplemented # In case the other object defines __rsub__ return self.__class__(years=self.years - other.years, months=self.months - other.months, days=self.days - other.days, hours=self.hours - other.hours, minutes=self.minutes - other.minutes, seconds=self.seconds - other.seconds, microseconds=self.microseconds - other.microseconds, leapdays=self.leapdays or other.leapdays, year=(self.year if self.year is not None else other.year), month=(self.month if self.month is not None else other.month), day=(self.day if self.day is not None else other.day), weekday=(self.weekday if self.weekday is not None else other.weekday), hour=(self.hour if self.hour is not None else other.hour), minute=(self.minute if self.minute is not None else other.minute), second=(self.second if self.second is not None else other.second), microsecond=(self.microsecond if self.microsecond is not None else other.microsecond)) def __neg__(self): return self.__class__(years=-self.years, months=-self.months, days=-self.days, hours=-self.hours, minutes=-self.minutes, seconds=-self.seconds, microseconds=-self.microseconds, leapdays=self.leapdays, year=self.year, month=self.month, day=self.day, weekday=self.weekday, hour=self.hour, minute=self.minute, second=self.second, microsecond=self.microsecond) def __bool__(self): return not (not self.years and not self.months and not self.days and not self.hours and not self.minutes and not self.seconds and not self.microseconds and not self.leapdays and self.year is None and self.month is None and self.day is None and self.weekday is None and self.hour is None and self.minute is None and self.second is None and self.microsecond is None) # Compatibility with Python 2.x __nonzero__ = __bool__ def __mul__(self, other): try: f = float(other) except TypeError: return NotImplemented return self.__class__(years=int(self.years f), months=int(self.months * f), days=int(self.days * f), hours=int(self.hours * f), minutes=int(self.minutes * f), seconds=int(self.seconds * f), microseconds=int(self.microseconds * f), leapdays=self.leapdays, year=self.year, month=self.month, day=self.day, weekday=self.weekday, hour=self.hour, minute=self.minute, second=self.second, microsecond=self.microsecond) __rmul__ = __mul__ def __eq__(self, other): if not isinstance(other, relativedelta): return NotImplemented if self.weekday or other.weekday: if not self.weekday or not other.weekday: return False if self.weekday.weekday != other.weekday.weekday: return False n1, n2 = self.weekday.n, other.weekday.n if n1 != n2 and not ((not n1 or n1 == 1) and (not n2 or n2 == 1)): return False return (self.years == other.years and self.months == other.months and self.days == other.days and self.hours == other.hours and self.minutes == other.minutes and self.seconds == other.seconds and self.microseconds == other.microseconds and self.leapdays == other.leapdays and self.year == other.year and self.month == other.month and self.day == other.day and self.hour == other.hour and self.minute == other.minute and self.second == other.second and self.microsecond == other.microsecond) __hash__ = None def __ne__(self, other): return not self.__eq__(other) def __div__(self, other): try: reciprocal = 1 / float(other) except TypeError: return NotImplemented return self.__mul__(reciprocal) __truediv__ = __div__ def __repr__(self): l = [] for attr in ["years", "months", "days", "leapdays", "hours", "minutes", "seconds", "microseconds"]: value = getattr(self, attr) if value: l.append("{attr}={value:+g}".format(attr=attr, value=value)) for attr in ["year", "month", "day", "weekday", "hour", "minute", "second", "microsecond"]: value = getattr(self, attr) if value is not None: l.append("{attr}={value}".format(attr=attr, value=repr(value))) return "{classname}({attrs})".format(classname=self.__class__.__name__, attrs=", ".join(l)) def _sign(x): return int(copysign(1, x)) # vim:ts=4:sw=4:et Back

Edit File : relativedelta.py | Size : 22.60 KB

# -*- coding: utf-8 -*-
import datetime
import calendar

import operator
from math import copysign

from six import integer_types
from warnings import warn

from ._common import weekday

MO, TU, WE, TH, FR, SA, SU = weekdays = tuple(weekday(x) for x in range(7))

__all__ = ["relativedelta", "MO", "TU", "WE", "TH", "FR", "SA", "SU"]

class relativedelta(object):
    """
    The relativedelta type is based on the specification of the excellent
    work done by M.-A. Lemburg in his
    `mx.DateTime <http://www.egenix.com/files/python/mxDateTime.html>`_ extension.
    However, notice that this type does *NOT* implement the same algorithm as
    his work. Do *NOT* expect it to behave like mx.DateTime's counterpart.

There are two different ways to build a relativedelta instance. The
    first one is passing it two date/datetime classes::

relativedelta(datetime1, datetime2)

The second one is passing it any number of the following keyword arguments::

relativedelta(arg1=x,arg2=y,arg3=z...)

year, month, day, hour, minute, second, microsecond:
            Absolute information (argument is singular); adding or subtracting a
            relativedelta with absolute information does not perform an aritmetic
            operation, but rather REPLACES the corresponding value in the
            original datetime with the value(s) in relativedelta.

years, months, weeks, days, hours, minutes, seconds, microseconds:
            Relative information, may be negative (argument is plural); adding
            or subtracting a relativedelta with relative information performs
            the corresponding aritmetic operation on the original datetime value
            with the information in the relativedelta.

weekday:
            One of the weekday instances (MO, TU, etc). These instances may
            receive a parameter N, specifying the Nth weekday, which could
            be positive or negative (like MO(+1) or MO(-2). Not specifying
            it is the same as specifying +1. You can also use an integer,
            where 0=MO.

leapdays:
            Will add given days to the date found, if year is a leap
            year, and the date found is post 28 of february.

yearday, nlyearday:
            Set the yearday or the non-leap year day (jump leap days).
            These are converted to day/month/leapdays information.

Here is the behavior of operations with relativedelta:

1. Calculate the absolute year, using the 'year' argument, or the
       original datetime year, if the argument is not present.

2. Add the relative 'years' argument to the absolute year.

3. Do steps 1 and 2 for month/months.

4. Calculate the absolute day, using the 'day' argument, or the
       original datetime day, if the argument is not present. Then,
       subtract from the day until it fits in the year and month
       found after their operations.

5. Add the relative 'days' argument to the absolute day. Notice
       that the 'weeks' argument is multiplied by 7 and added to
       'days'.

6. Do steps 1 and 2 for hour/hours, minute/minutes, second/seconds,
       microsecond/microseconds.

7. If the 'weekday' argument is present, calculate the weekday,
       with the given (wday, nth) tuple. wday is the index of the
       weekday (0-6, 0=Mon), and nth is the number of weeks to add
       forward or backward, depending on its signal. Notice that if
       the calculated date is already Monday, for example, using
       (0, 1) or (0, -1) won't change the day.
    """

def __init__(self, dt1=None, dt2=None,
                 years=0, months=0, days=0, leapdays=0, weeks=0,
                 hours=0, minutes=0, seconds=0, microseconds=0,
                 year=None, month=None, day=None, weekday=None,
                 yearday=None, nlyearday=None,
                 hour=None, minute=None, second=None, microsecond=None):

# Check for non-integer values in integer-only quantities
        if any(x is not None and x != int(x) for x in (years, months)):
            raise ValueError("Non-integer years and months are "
                             "ambiguous and not currently supported.")

if dt1 and dt2:
            # datetime is a subclass of date. So both must be date
            if not (isinstance(dt1, datetime.date) and
                    isinstance(dt2, datetime.date)):
                raise TypeError("relativedelta only diffs datetime/date")

# We allow two dates, or two datetimes, so we coerce them to be
            # of the same type
            if (isinstance(dt1, datetime.datetime) !=
                    isinstance(dt2, datetime.datetime)):
                if not isinstance(dt1, datetime.datetime):
                    dt1 = datetime.datetime.fromordinal(dt1.toordinal())
                elif not isinstance(dt2, datetime.datetime):
                    dt2 = datetime.datetime.fromordinal(dt2.toordinal())

self.years = 0
            self.months = 0
            self.days = 0
            self.leapdays = 0
            self.hours = 0
            self.minutes = 0
            self.seconds = 0
            self.microseconds = 0
            self.year = None
            self.month = None
            self.day = None
            self.weekday = None
            self.hour = None
            self.minute = None
            self.second = None
            self.microsecond = None
            self._has_time = 0

# Get year / month delta between the two
            months = (dt1.year - dt2.year) * 12 + (dt1.month - dt2.month)
            self._set_months(months)

# Remove the year/month delta so the timedelta is just well-defined
            # time units (seconds, days and microseconds)
            dtm = self.__radd__(dt2)

# If we've overshot our target, make an adjustment
            if dt1 < dt2:
                compare = operator.gt
                increment = 1
            else:
                compare = operator.lt
                increment = -1

while compare(dt1, dtm):
                months += increment
                self._set_months(months)
                dtm = self.__radd__(dt2)

# Get the timedelta between the "months-adjusted" date and dt1
            delta = dt1 - dtm
            self.seconds = delta.seconds + delta.days * 86400
            self.microseconds = delta.microseconds
        else:
            # Relative information
            self.years = years
            self.months = months
            self.days = days + weeks * 7
            self.leapdays = leapdays
            self.hours = hours
            self.minutes = minutes
            self.seconds = seconds
            self.microseconds = microseconds

# Absolute information
            self.year = year
            self.month = month
            self.day = day
            self.hour = hour
            self.minute = minute
            self.second = second
            self.microsecond = microsecond

if any(x is not None and int(x) != x
                   for x in (year, month, day, hour,
                             minute, second, microsecond)):
                # For now we'll deprecate floats - later it'll be an error.
                warn("Non-integer value passed as absolute information. " +
                     "This is not a well-defined condition and will raise " +
                     "errors in future versions.", DeprecationWarning)

if isinstance(weekday, integer_types):
                self.weekday = weekdays[weekday]
            else:
                self.weekday = weekday

yday = 0
            if nlyearday:
                yday = nlyearday
            elif yearday:
                yday = yearday
                if yearday > 59:
                    self.leapdays = -1
            if yday:
                ydayidx = [31, 59, 90, 120, 151, 181, 212,
                           243, 273, 304, 334, 366]
                for idx, ydays in enumerate(ydayidx):
                    if yday <= ydays:
                        self.month = idx+1
                        if idx == 0:
                            self.day = yday
                        else:
                            self.day = yday-ydayidx[idx-1]
                        break
                else:
                    raise ValueError("invalid year day (%d)" % yday)

self._fix()

def _fix(self):
        if abs(self.microseconds) > 999999:
            s = _sign(self.microseconds)
            div, mod = divmod(self.microseconds * s, 1000000)
            self.microseconds = mod * s
            self.seconds += div * s
        if abs(self.seconds) > 59:
            s = _sign(self.seconds)
            div, mod = divmod(self.seconds * s, 60)
            self.seconds = mod * s
            self.minutes += div * s
        if abs(self.minutes) > 59:
            s = _sign(self.minutes)
            div, mod = divmod(self.minutes * s, 60)
            self.minutes = mod * s
            self.hours += div * s
        if abs(self.hours) > 23:
            s = _sign(self.hours)
            div, mod = divmod(self.hours * s, 24)
            self.hours = mod * s
            self.days += div * s
        if abs(self.months) > 11:
            s = _sign(self.months)
            div, mod = divmod(self.months * s, 12)
            self.months = mod * s
            self.years += div * s
        if (self.hours or self.minutes or self.seconds or self.microseconds
                or self.hour is not None or self.minute is not None or
                self.second is not None or self.microsecond is not None):
            self._has_time = 1
        else:
            self._has_time = 0

@property
    def weeks(self):
        return self.days // 7

@weeks.setter
    def weeks(self, value):
        self.days = self.days - (self.weeks * 7) + value * 7

def _set_months(self, months):
        self.months = months
        if abs(self.months) > 11:
            s = _sign(self.months)
            div, mod = divmod(self.months * s, 12)
            self.months = mod * s
            self.years = div * s
        else:
            self.years = 0

def normalized(self):
        """
        Return a version of this object represented entirely using integer
        values for the relative attributes.

>>> relativedelta(days=1.5, hours=2).normalized()
        relativedelta(days=1, hours=14)

:return:
            Returns a :class:`dateutil.relativedelta.relativedelta` object.
        """
        # Cascade remainders down (rounding each to roughly nearest microsecond)
        days = int(self.days)

hours_f = round(self.hours + 24 * (self.days - days), 11)
        hours = int(hours_f)

minutes_f = round(self.minutes + 60 * (hours_f - hours), 10)
        minutes = int(minutes_f)

seconds_f = round(self.seconds + 60 * (minutes_f - minutes), 8)
        seconds = int(seconds_f)

microseconds = round(self.microseconds + 1e6 * (seconds_f - seconds))

# Constructor carries overflow back up with call to _fix()
        return self.__class__(years=self.years, months=self.months,
                              days=days, hours=hours, minutes=minutes,
                              seconds=seconds, microseconds=microseconds,
                              leapdays=self.leapdays, year=self.year,
                              month=self.month, day=self.day,
                              weekday=self.weekday, hour=self.hour,
                              minute=self.minute, second=self.second,
                              microsecond=self.microsecond)

def __add__(self, other):
        if isinstance(other, relativedelta):
            return self.__class__(years=other.years + self.years,
                                 months=other.months + self.months,
                                 days=other.days + self.days,
                                 hours=other.hours + self.hours,
                                 minutes=other.minutes + self.minutes,
                                 seconds=other.seconds + self.seconds,
                                 microseconds=(other.microseconds +
                                               self.microseconds),
                                 leapdays=other.leapdays or self.leapdays,
                                 year=(other.year if other.year is not None
                                       else self.year),
                                 month=(other.month if other.month is not None
                                        else self.month),
                                 day=(other.day if other.day is not None
                                      else self.day),
                                 weekday=(other.weekday if other.weekday is not None
                                          else self.weekday),
                                 hour=(other.hour if other.hour is not None
                                       else self.hour),
                                 minute=(other.minute if other.minute is not None
                                         else self.minute),
                                 second=(other.second if other.second is not None
                                         else self.second),
                                 microsecond=(other.microsecond if other.microsecond
                                              is not None else
                                              self.microsecond))
        if isinstance(other, datetime.timedelta):
            return self.__class__(years=self.years,
                                  months=self.months,
                                  days=self.days + other.days,
                                  hours=self.hours,
                                  minutes=self.minutes,
                                  seconds=self.seconds + other.seconds,
                                  microseconds=self.microseconds + other.microseconds,
                                  leapdays=self.leapdays,
                                  year=self.year,
                                  month=self.month,
                                  day=self.day,
                                  weekday=self.weekday,
                                  hour=self.hour,
                                  minute=self.minute,
                                  second=self.second,
                                  microsecond=self.microsecond)
        if not isinstance(other, datetime.date):
            return NotImplemented
        elif self._has_time and not isinstance(other, datetime.datetime):
            other = datetime.datetime.fromordinal(other.toordinal())
        year = (self.year or other.year)+self.years
        month = self.month or other.month
        if self.months:
            assert 1 <= abs(self.months) <= 12
            month += self.months
            if month > 12:
                year += 1
                month -= 12
            elif month < 1:
                year -= 1
                month += 12
        day = min(calendar.monthrange(year, month)[1],
                  self.day or other.day)
        repl = {"year": year, "month": month, "day": day}
        for attr in ["hour", "minute", "second", "microsecond"]:
            value = getattr(self, attr)
            if value is not None:
                repl[attr] = value
        days = self.days
        if self.leapdays and month > 2 and calendar.isleap(year):
            days += self.leapdays
        ret = (other.replace(**repl)
               + datetime.timedelta(days=days,
                                    hours=self.hours,
                                    minutes=self.minutes,
                                    seconds=self.seconds,
                                    microseconds=self.microseconds))
        if self.weekday:
            weekday, nth = self.weekday.weekday, self.weekday.n or 1
            jumpdays = (abs(nth) - 1) * 7
            if nth > 0:
                jumpdays += (7 - ret.weekday() + weekday) % 7
            else:
                jumpdays += (ret.weekday() - weekday) % 7
                jumpdays *= -1
            ret += datetime.timedelta(days=jumpdays)
        return ret

def __radd__(self, other):
        return self.__add__(other)

def __rsub__(self, other):
        return self.__neg__().__radd__(other)

def __sub__(self, other):
        if not isinstance(other, relativedelta):
            return NotImplemented   # In case the other object defines __rsub__
        return self.__class__(years=self.years - other.years,
                             months=self.months - other.months,
                             days=self.days - other.days,
                             hours=self.hours - other.hours,
                             minutes=self.minutes - other.minutes,
                             seconds=self.seconds - other.seconds,
                             microseconds=self.microseconds - other.microseconds,
                             leapdays=self.leapdays or other.leapdays,
                             year=(self.year if self.year is not None
                                   else other.year),
                             month=(self.month if self.month is not None else
                                    other.month),
                             day=(self.day if self.day is not None else
                                  other.day),
                             weekday=(self.weekday if self.weekday is not None else
                                      other.weekday),
                             hour=(self.hour if self.hour is not None else
                                   other.hour),
                             minute=(self.minute if self.minute is not None else
                                     other.minute),
                             second=(self.second if self.second is not None else
                                     other.second),
                             microsecond=(self.microsecond if self.microsecond
                                          is not None else
                                          other.microsecond))

def __neg__(self):
        return self.__class__(years=-self.years,
                             months=-self.months,
                             days=-self.days,
                             hours=-self.hours,
                             minutes=-self.minutes,
                             seconds=-self.seconds,
                             microseconds=-self.microseconds,
                             leapdays=self.leapdays,
                             year=self.year,
                             month=self.month,
                             day=self.day,
                             weekday=self.weekday,
                             hour=self.hour,
                             minute=self.minute,
                             second=self.second,
                             microsecond=self.microsecond)

def __bool__(self):
        return not (not self.years and
                    not self.months and
                    not self.days and
                    not self.hours and
                    not self.minutes and
                    not self.seconds and
                    not self.microseconds and
                    not self.leapdays and
                    self.year is None and
                    self.month is None and
                    self.day is None and
                    self.weekday is None and
                    self.hour is None and
                    self.minute is None and
                    self.second is None and
                    self.microsecond is None)
    # Compatibility with Python 2.x
    __nonzero__ = __bool__

def __mul__(self, other):
        try:
            f = float(other)
        except TypeError:
            return NotImplemented

return self.__class__(years=int(self.years * f),
                             months=int(self.months * f),
                             days=int(self.days * f),
                             hours=int(self.hours * f),
                             minutes=int(self.minutes * f),
                             seconds=int(self.seconds * f),
                             microseconds=int(self.microseconds * f),
                             leapdays=self.leapdays,
                             year=self.year,
                             month=self.month,
                             day=self.day,
                             weekday=self.weekday,
                             hour=self.hour,
                             minute=self.minute,
                             second=self.second,
                             microsecond=self.microsecond)

__rmul__ = __mul__

def __eq__(self, other):
        if not isinstance(other, relativedelta):
            return NotImplemented
        if self.weekday or other.weekday:
            if not self.weekday or not other.weekday:
                return False
            if self.weekday.weekday != other.weekday.weekday:
                return False
            n1, n2 = self.weekday.n, other.weekday.n
            if n1 != n2 and not ((not n1 or n1 == 1) and (not n2 or n2 == 1)):
                return False
        return (self.years == other.years and
                self.months == other.months and
                self.days == other.days and
                self.hours == other.hours and
                self.minutes == other.minutes and
                self.seconds == other.seconds and
                self.microseconds == other.microseconds and
                self.leapdays == other.leapdays and
                self.year == other.year and
                self.month == other.month and
                self.day == other.day and
                self.hour == other.hour and
                self.minute == other.minute and
                self.second == other.second and
                self.microsecond == other.microsecond)

__hash__ = None

def __ne__(self, other):
        return not self.__eq__(other)

def __div__(self, other):
        try:
            reciprocal = 1 / float(other)
        except TypeError:
            return NotImplemented

return self.__mul__(reciprocal)

__truediv__ = __div__

def __repr__(self):
        l = []
        for attr in ["years", "months", "days", "leapdays",
                     "hours", "minutes", "seconds", "microseconds"]:
            value = getattr(self, attr)
            if value:
                l.append("{attr}={value:+g}".format(attr=attr, value=value))
        for attr in ["year", "month", "day", "weekday",
                     "hour", "minute", "second", "microsecond"]:
            value = getattr(self, attr)
            if value is not None:
                l.append("{attr}={value}".format(attr=attr, value=repr(value)))
        return "{classname}({attrs})".format(classname=self.__class__.__name__,
                                             attrs=", ".join(l))

def _sign(x):
    return int(copysign(1, x))

# vim:ts=4:sw=4:et

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