/usr/share/pyshared/pandas/core/daterange.py is in python-pandas 0.7.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from datetime import datetime
import operator
import numpy as np
from pandas.core.index import Index
import pandas.core.datetools as datetools
__all__ = ['DateRange']
#-------------------------------------------------------------------------------
# DateRange class
def _bin_op(op):
def f(self, other):
return op(self.view(np.ndarray), other)
return f
_CACHE_START = datetime(1950, 1, 1)
_CACHE_END = datetime(2030, 1, 1)
_daterange_cache = {}
class DateRange(Index):
"""
Fixed frequency date range according to input parameters.
Input dates satisfy:
begin <= d <= end, where d lies on the given offset
Parameters
----------
start : {datetime, None}
left boundary for range
end : {datetime, None}
right boundary for range
periods : int
Number of periods to generate.
offset : DateOffset, default is 1 BusinessDay
Used to determine the dates returned
time_rule : time_rule to use
tzinfo : pytz.timezone
To endow DateRange with time zone information
"""
def __new__(cls, start=None, end=None, periods=None,
offset=datetools.bday, time_rule=None,
tzinfo=None, name=None, **kwds):
time_rule = kwds.get('timeRule', time_rule)
if time_rule is not None:
offset = datetools.getOffset(time_rule)
if time_rule is None:
if offset in datetools._offsetNames:
time_rule = datetools._offsetNames[offset]
# Cachable
if not start:
start = kwds.get('begin')
if not periods:
periods = kwds.get('nPeriods')
start = datetools.to_datetime(start)
end = datetools.to_datetime(end)
if start is not None and not isinstance(start, datetime):
raise ValueError('Failed to convert %s to datetime' % start)
if end is not None and not isinstance(end, datetime):
raise ValueError('Failed to convert %s to datetime' % end)
# inside cache range. Handle UTC case
useCache = _will_use_cache(offset)
start, end, tzinfo = _figure_out_timezone(start, end, tzinfo)
useCache = useCache and _naive_in_cache_range(start, end)
if useCache:
index = cls._cached_range(start, end, periods=periods,
offset=offset, time_rule=time_rule,
name=name)
if tzinfo is None:
return index
else:
xdr = generate_range(start=start, end=end, periods=periods,
offset=offset, time_rule=time_rule)
index = list(xdr)
if tzinfo is not None:
index = [d.replace(tzinfo=tzinfo) for d in index]
index = np.array(index, dtype=object, copy=False)
index = index.view(cls)
index.name = name
index.offset = offset
index.tzinfo = tzinfo
return index
def __reduce__(self):
"""Necessary for making this object picklable"""
a, b, state = Index.__reduce__(self)
aug_state = state, self.offset, self.tzinfo
return a, b, aug_state
def __setstate__(self, aug_state):
"""Necessary for making this object picklable"""
index_state = aug_state[:1]
offset = aug_state[1]
# for backwards compatibility
if len(aug_state) > 2:
tzinfo = aug_state[2]
else: # pragma: no cover
tzinfo = None
self.offset = offset
self.tzinfo = tzinfo
Index.__setstate__(self, *index_state)
def equals(self, other):
if self is other:
return True
if not isinstance(other, Index):
return False
return Index.equals(self.view(Index), other)
@property
def is_all_dates(self):
return True
@classmethod
def _cached_range(cls, start=None, end=None, periods=None, offset=None,
time_rule=None, name=None):
# HACK: fix this dependency later
if time_rule is not None:
offset = datetools.getOffset(time_rule)
if offset is None:
raise Exception('Must provide a DateOffset!')
if offset not in _daterange_cache:
xdr = generate_range(_CACHE_START, _CACHE_END, offset=offset)
arr = np.array(list(xdr), dtype=object, copy=False)
cachedRange = arr.view(DateRange)
cachedRange.offset = offset
cachedRange.tzinfo = None
cachedRange.name = None
_daterange_cache[offset] = cachedRange
else:
cachedRange = _daterange_cache[offset]
if start is None:
if end is None:
raise Exception('Must provide start or end date!')
if periods is None:
raise Exception('Must provide number of periods!')
assert(isinstance(end, datetime))
end = offset.rollback(end)
endLoc = cachedRange.get_loc(end) + 1
startLoc = endLoc - periods
elif end is None:
assert(isinstance(start, datetime))
start = offset.rollforward(start)
startLoc = cachedRange.get_loc(start)
if periods is None:
raise Exception('Must provide number of periods!')
endLoc = startLoc + periods
else:
start = offset.rollforward(start)
end = offset.rollback(end)
startLoc = cachedRange.get_loc(start)
endLoc = cachedRange.get_loc(end) + 1
indexSlice = cachedRange[startLoc:endLoc]
indexSlice.name = name
return indexSlice
def __array_finalize__(self, obj):
if self.ndim == 0: # pragma: no cover
return self.item()
self.offset = getattr(obj, 'offset', None)
__lt__ = _bin_op(operator.lt)
__le__ = _bin_op(operator.le)
__gt__ = _bin_op(operator.gt)
__ge__ = _bin_op(operator.ge)
__eq__ = _bin_op(operator.eq)
def __getslice__(self, i, j):
return self.__getitem__(slice(i, j))
def __getitem__(self, key):
"""Override numpy.ndarray's __getitem__ method to work as desired"""
result = self.view(np.ndarray)[key]
if isinstance(key, (int, np.integer)):
return result
elif isinstance(key, slice):
new_index = result.view(DateRange)
if key.step is not None:
new_index.offset = key.step * self.offset
else:
new_index.offset = self.offset
new_index.tzinfo = self.tzinfo
new_index.name = self.name
return new_index
else:
if result.ndim > 1:
return result
return Index(result, name=self.name)
def summary(self):
if len(self) > 0:
index_summary = ', %s to %s' % (self[0], self[-1])
else:
index_summary = ''
sum_line = 'DateRange: %s entries%s' % (len(self), index_summary)
sum_line += '\noffset: %s' % self.offset
if self.tzinfo is not None:
sum_line += ', tzinfo: %s' % self.tzinfo
return sum_line
def __repr__(self):
output = str(self.__class__) + '\n'
output += 'offset: %s, tzinfo: %s\n' % (self.offset, self.tzinfo)
if len(self) > 0:
output += '[%s, ..., %s]\n' % (self[0], self[-1])
output += 'length: %d' % len(self)
return output
__str__ = __repr__
def shift(self, n, offset=None):
"""
Specialized shift which produces a DateRange
Parameters
----------
n : int
Periods to shift by
offset : DateOffset or timedelta-like, optional
Returns
-------
shifted : DateRange
"""
if offset is not None and offset != self.offset:
return Index.shift(self, n, offset)
if n == 0:
# immutable so OK
return self
start = self[0] + n * self.offset
end = self[-1] + n * self.offset
return DateRange(start, end, offset=self.offset, name=self.name)
def union(self, other):
"""
Specialized union for DateRange objects. If combine
overlapping ranges with the same DateOffset, will be much
faster than Index.union
Parameters
----------
other : DateRange or array-like
Returns
-------
y : Index or DateRange
"""
if not isinstance(other, DateRange) or other.offset != self.offset:
return Index.union(self.view(Index), other)
if self._can_fast_union(other):
return self._fast_union(other)
else:
return Index.union(self, other)
def _wrap_union_result(self, other, result):
# If we are here, _can_fast_union is false or other is not a
# DateRange, so their union has to be an Index.
name = self.name if self.name == other.name else None
return Index(result, name=name)
def _wrap_joined_index(self, joined, other):
name = self.name if self.name == other.name else None
if (isinstance(other, DateRange)
and self.offset == other.offset
and self._can_fast_union(other)):
joined = self._view_like(joined)
joined.name = name
return joined
else:
return Index(joined, name=name)
def _can_fast_union(self, other):
offset = self.offset
# to make our life easier, "sort" the two ranges
if self[0] <= other[0]:
left, right = self, other
else:
left, right = other, self
left_end = left[-1]
right_start = right[0]
# Only need to "adjoin", not overlap
return (left_end + offset) >= right_start
def _fast_union(self, other):
# to make our life easier, "sort" the two ranges
if self[0] <= other[0]:
left, right = self, other
else:
left, right = other, self
left_start, left_end = left[0], left[-1]
right_end = right[-1]
if not _will_use_cache(self.offset):
# concatenate dates
if left_end < right_end:
loc = right.searchsorted(left_end, side='right')
right_chunk = right.values[loc:]
dates = np.concatenate((left.values, right_chunk))
return self._view_like(dates)
else:
return left
else:
return DateRange(left_start, max(left_end, right_end),
offset=left.offset)
def intersection(self, other):
"""
Specialized intersection for DateRange objects. May be much faster than
Index.union
Parameters
----------
other : DateRange or array-like
Returns
-------
y : Index or DateRange
"""
if not isinstance(other, DateRange) or other.offset != self.offset:
return Index.intersection(self.view(Index), other)
# to make our life easier, "sort" the two ranges
if self[0] <= other[0]:
left, right = self, other
else:
left, right = other, self
end = min(left[-1], right[-1])
start = right[0]
if end < start:
return Index([])
else:
lslice = slice(*left.slice_locs(start, end))
left_chunk = left.values[lslice]
return self._view_like(left_chunk)
def _view_like(self, ndarray):
result = ndarray.view(DateRange)
result.offset = self.offset
result.tzinfo = self.tzinfo
result.name = self.name
return result
def tz_normalize(self, tz):
"""
Convert DateRange from one time zone to another (using pytz)
Returns
-------
normalized : DateRange
"""
new_dates = np.array([tz.normalize(x) for x in self])
new_dates = new_dates.view(DateRange)
new_dates.offset = self.offset
new_dates.tzinfo = tz
new_dates.name = self.name
return new_dates
def tz_localize(self, tz):
"""
Localize tzinfo-naive DateRange to given time zone (using pytz)
Returns
-------
localized : DateRange
"""
new_dates = np.array([tz.localize(x) for x in self])
new_dates = new_dates.view(DateRange)
new_dates.offset = self.offset
new_dates.tzinfo = tz
new_dates.name = self.name
return new_dates
def tz_validate(self):
"""
For a localized time zone, verify that there are no DST ambiguities
Returns
-------
result : boolean
True if there are no DST ambiguities
"""
import pytz
tz = self.tzinfo
if tz is None or tz is pytz.utc:
return True
# See if there are any DST resolution problems
for date in self:
try:
tz.utcoffset(date.replace(tzinfo=None))
except pytz.InvalidTimeError:
return False
return True
def generate_range(start=None, end=None, periods=None,
offset=datetools.BDay(), time_rule=None):
"""
Generates a sequence of dates corresponding to the specified time
offset. Similar to dateutil.rrule except uses pandas DateOffset
objects to represent time increments
Parameters
----------
start : datetime (default None)
end : datetime (default None)
periods : int, optional
Note
----
* This method is faster for generating weekdays than dateutil.rrule
* At least two of (start, end, periods) must be specified.
* If both start and end are specified, the returned dates will
satisfy start <= date <= end.
Returns
-------
dates : generator object
See also
--------
DateRange, dateutil.rrule
"""
if time_rule is not None:
offset = datetools.getOffset(time_rule)
if time_rule is None:
if offset in datetools._offsetNames:
time_rule = datetools._offsetNames[offset]
start = datetools.to_datetime(start)
end = datetools.to_datetime(end)
if start and not offset.onOffset(start):
start = offset.rollforward(start)
if end and not offset.onOffset(end):
end = offset.rollback(end)
if periods is None and end < start:
end = None
periods = 0
if end is None:
end = start + (periods - 1) * offset
if start is None:
start = end - (periods - 1) * offset
cur = start
if offset._normalizeFirst:
cur = datetools.normalize_date(cur)
next_date = cur
while cur <= end:
yield cur
# faster than cur + offset
next_date = offset.apply(cur)
if next_date <= cur:
raise ValueError('Offset %s did not increment date' % offset)
cur = next_date
# Do I want to cache UTC dates? Can't decide...
# def _utc_in_cache_range(start, end):
# import pytz
# if start is None or end is None:
# return False
# _CACHE_START = datetime(1950, 1, 1, tzinfo=pytz.utc)
# _CACHE_END = datetime(2030, 1, 1, tzinfo=pytz.utc)
# try:
# assert(_isutc(start))
# assert(_isutc(end))
# except AssertionError:
# raise Exception('To use localized time zone, create '
# 'DateRange with pytz.UTC then call '
# 'tz_normalize')
# return _in_range(start, end, _CACHE_START, _CACHE_END)
# def _isutc(dt):
# import pytz
# return dt.tzinfo is pytz.utc
# def _hastz(dt):
# return dt is not None and dt.tzinfo is not None
# def _have_pytz():
# try:
# import pytz
# return True
# except ImportError:
# return False
def _in_range(start, end, rng_start, rng_end):
return start > rng_start and end < rng_end
def _naive_in_cache_range(start, end):
if start is None or end is None:
return False
else:
return _in_range(start, end, _CACHE_START, _CACHE_END)
def _figure_out_timezone(start, end, tzinfo):
inferred_tz = _infer_tzinfo(start, end)
tz = inferred_tz
if inferred_tz is None and tzinfo is not None:
tz = tzinfo
elif tzinfo is not None:
assert(inferred_tz == tzinfo)
# make tz naive for now
start = start if start is None else start.replace(tzinfo=None)
end = end if end is None else end.replace(tzinfo=None)
return start, end, tz
def _infer_tzinfo(start, end):
def _infer(a, b):
tz = a.tzinfo
if b and b.tzinfo:
assert(tz == b.tzinfo)
return tz
tz = None
if start is not None:
tz = _infer(start, end)
elif end is not None:
tz = _infer(end, start)
return tz
def _will_use_cache(offset):
return (offset.isAnchored() and
isinstance(offset, datetools.CacheableOffset))
if __name__ == '__main__':
import pytz
# just want it to work
tz = pytz.timezone('US/Eastern')
dr = DateRange(datetime(2011, 3, 12, tzinfo=pytz.utc),
periods=50, offset=datetools.Hour())
dr2 = dr.tz_normalize(tz)
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