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Editing: time.py
"""Time humanizing functions. These are largely borrowed from Django's `contrib.humanize`. """ from __future__ import annotations import collections.abc import datetime as dt import math import typing from enum import Enum from functools import total_ordering from typing import Any from .i18n import _gettext as _ from .i18n import _ngettext from .number import intcomma __all__ = [ "naturaldelta", "naturaltime", "naturalday", "naturaldate", "precisedelta", ] @total_ordering class Unit(Enum): MICROSECONDS = 0 MILLISECONDS = 1 SECONDS = 2 MINUTES = 3 HOURS = 4 DAYS = 5 MONTHS = 6 YEARS = 7 def __lt__(self, other: typing.Any) -> typing.Any: if self.__class__ is other.__class__: return self.value < other.value return NotImplemented def _now() -> dt.datetime: return dt.datetime.now() def _abs_timedelta(delta: dt.timedelta) -> dt.timedelta: """Return an "absolute" value for a timedelta, always representing a time distance. Args: delta (datetime.timedelta): Input timedelta. Returns: datetime.timedelta: Absolute timedelta. """ if delta.days < 0: now = _now() return now - (now + delta) return delta def _date_and_delta( value: typing.Any, *, now: dt.datetime | None = None ) -> tuple[typing.Any, typing.Any]: """Turn a value into a date and a timedelta which represents how long ago it was. If that's not possible, return `(None, value)`. """ if not now: now = _now() if isinstance(value, dt.datetime): date = value delta = now - value elif isinstance(value, dt.timedelta): date = now - value delta = value else: try: value = int(value) delta = dt.timedelta(seconds=value) date = now - delta except (ValueError, TypeError): return None, value return date, _abs_timedelta(delta) def naturaldelta( value: dt.timedelta | float, months: bool = True, minimum_unit: str = "seconds", ) -> str: """Return a natural representation of a timedelta or number of seconds. This is similar to `naturaltime`, but does not add tense to the result. Args: value (datetime.timedelta, int or float): A timedelta or a number of seconds. months (bool): If `True`, then a number of months (based on 30.5 days) will be used for fuzziness between years. minimum_unit (str): The lowest unit that can be used. Returns: str (str or `value`): A natural representation of the amount of time elapsed unless `value` is not datetime.timedelta or cannot be converted to int. In that case, a `value` is returned unchanged. Raises: OverflowError: If `value` is too large to convert to datetime.timedelta. Examples Compare two timestamps in a custom local timezone:: import datetime as dt from dateutil.tz import gettz berlin = gettz("Europe/Berlin") now = dt.datetime.now(tz=berlin) later = now + dt.timedelta(minutes=30) assert naturaldelta(later - now) == "30 minutes" """ tmp = Unit[minimum_unit.upper()] if tmp not in (Unit.SECONDS, Unit.MILLISECONDS, Unit.MICROSECONDS): msg = f"Minimum unit '{minimum_unit}' not supported" raise ValueError(msg) min_unit = tmp if isinstance(value, dt.timedelta): delta = value else: try: value = int(value) delta = dt.timedelta(seconds=value) except (ValueError, TypeError): return str(value) use_months = months seconds = abs(delta.seconds) days = abs(delta.days) years = days // 365 days = days % 365 num_months = int(days // 30.5) if not years and days < 1: if seconds == 0: if min_unit == Unit.MICROSECONDS and delta.microseconds < 1000: return ( _ngettext("%d microsecond", "%d microseconds", delta.microseconds) % delta.microseconds ) if min_unit == Unit.MILLISECONDS or ( min_unit == Unit.MICROSECONDS and 1000 <= delta.microseconds < 1_000_000 ): milliseconds = delta.microseconds / 1000 return ( _ngettext("%d millisecond", "%d milliseconds", int(milliseconds)) % milliseconds ) return _("a moment") if seconds == 1: return _("a second") if seconds < 60: return _ngettext("%d second", "%d seconds", seconds) % seconds if 60 <= seconds < 120: return _("a minute") if 120 <= seconds < 3600: minutes = seconds // 60 return _ngettext("%d minute", "%d minutes", minutes) % minutes if 3600 <= seconds < 3600 * 2: return _("an hour") if 3600 < seconds: hours = seconds // 3600 return _ngettext("%d hour", "%d hours", hours) % hours elif years == 0: if days == 1: return _("a day") if not use_months: return _ngettext("%d day", "%d days", days) % days if not num_months: return _ngettext("%d day", "%d days", days) % days if num_months == 1: return _("a month") return _ngettext("%d month", "%d months", num_months) % num_months elif years == 1: if not num_months and not days: return _("a year") if not num_months: return _ngettext("1 year, %d day", "1 year, %d days", days) % days if use_months: if num_months == 1: return _("1 year, 1 month") return ( _ngettext("1 year, %d month", "1 year, %d months", num_months) % num_months ) return _ngettext("1 year, %d day", "1 year, %d days", days) % days return _ngettext("%d year", "%d years", years).replace("%d", "%s") % intcomma(years) def naturaltime( value: dt.datetime | dt.timedelta | float, future: bool = False, months: bool = True, minimum_unit: str = "seconds", when: dt.datetime | None = None, ) -> str: """Return a natural representation of a time in a resolution that makes sense. This is more or less compatible with Django's `naturaltime` filter. Args: value (datetime.datetime, datetime.timedelta, int or float): A `datetime`, a `timedelta`, or a number of seconds. future (bool): Ignored for `datetime`s and `timedelta`s, where the tense is always figured out based on the current time. For integers and floats, the return value will be past tense by default, unless future is `True`. months (bool): If `True`, then a number of months (based on 30.5 days) will be used for fuzziness between years. minimum_unit (str): The lowest unit that can be used. when (datetime.datetime): Point in time relative to which _value_ is interpreted. Defaults to the current time in the local timezone. Returns: str: A natural representation of the input in a resolution that makes sense. """ value = _convert_aware_datetime(value) when = _convert_aware_datetime(when) now = when or _now() date, delta = _date_and_delta(value, now=now) if date is None: return str(value) # determine tense by value only if datetime/timedelta were passed if isinstance(value, (dt.datetime, dt.timedelta)): future = date > now ago = _("%s from now") if future else _("%s ago") delta = naturaldelta(delta, months, minimum_unit) if delta == _("a moment"): return _("now") return str(ago % delta) def _convert_aware_datetime( value: dt.datetime | dt.timedelta | float | None, ) -> Any: """Convert aware datetime to naive datetime and pass through any other type.""" if isinstance(value, dt.datetime) and value.tzinfo is not None: value = dt.datetime.fromtimestamp(value.timestamp()) return value def naturalday(value: dt.date | dt.datetime, format: str = "%b %d") -> str: """Return a natural day. For date values that are tomorrow, today or yesterday compared to present day return representing string. Otherwise, return a string formatted according to `format`. """ try: value = dt.date(value.year, value.month, value.day) except AttributeError: # Passed value wasn't date-ish return str(value) except (OverflowError, ValueError): # Date arguments out of range return str(value) delta = value - dt.date.today() if delta.days == 0: return _("today") if delta.days == 1: return _("tomorrow") if delta.days == -1: return _("yesterday") return value.strftime(format) def naturaldate(value: dt.date | dt.datetime) -> str: """Like `naturalday`, but append a year for dates more than ~five months away.""" try: value = dt.date(value.year, value.month, value.day) except AttributeError: # Passed value wasn't date-ish return str(value) except (OverflowError, ValueError): # Date arguments out of range return str(value) delta = _abs_timedelta(value - dt.date.today()) if delta.days >= 5 * 365 / 12: return naturalday(value, "%b %d %Y") return naturalday(value) def _quotient_and_remainder( value: float, divisor: float, unit: Unit, minimum_unit: Unit, suppress: collections.abc.Iterable[Unit], ) -> tuple[float, float]: """Divide `value` by `divisor` returning the quotient and remainder. If `unit` is `minimum_unit`, makes the quotient a float number and the remainder will be zero. The rational is that if `unit` is the unit of the quotient, we cannot represent the remainder because it would require a unit smaller than the `minimum_unit`. >>> from humanize.time import _quotient_and_remainder, Unit >>> _quotient_and_remainder(36, 24, Unit.DAYS, Unit.DAYS, []) (1.5, 0) If unit is in `suppress`, the quotient will be zero and the remainder will be the initial value. The idea is that if we cannot use `unit`, we are forced to use a lower unit so we cannot do the division. >>> _quotient_and_remainder(36, 24, Unit.DAYS, Unit.HOURS, [Unit.DAYS]) (0, 36) In other case return quotient and remainder as `divmod` would do it. >>> _quotient_and_remainder(36, 24, Unit.DAYS, Unit.HOURS, []) (1, 12) """ if unit == minimum_unit: return value / divisor, 0 if unit in suppress: return 0, value return divmod(value, divisor) def _carry( value1: float, value2: float, ratio: float, unit: Unit, min_unit: Unit, suppress: typing.Iterable[Unit], ) -> tuple[float, float]: """Return a tuple with two values. If the unit is in `suppress`, multiply `value1` by `ratio` and add it to `value2` (carry to right). The idea is that if we cannot represent `value1` we need to represent it in a lower unit. >>> from humanize.time import _carry, Unit >>> _carry(2, 6, 24, Unit.DAYS, Unit.SECONDS, [Unit.DAYS]) (0, 54) If the unit is the minimum unit, `value2` is divided by `ratio` and added to `value1` (carry to left). We assume that `value2` has a lower unit so we need to carry it to `value1`. >>> _carry(2, 6, 24, Unit.DAYS, Unit.DAYS, []) (2.25, 0) Otherwise, just return the same input: >>> _carry(2, 6, 24, Unit.DAYS, Unit.SECONDS, []) (2, 6) """ if unit == min_unit: return value1 + value2 / ratio, 0 if unit in suppress: return 0, value2 + value1 * ratio return value1, value2 def _suitable_minimum_unit(min_unit: Unit, suppress: typing.Iterable[Unit]) -> Unit: """Return a minimum unit suitable that is not suppressed. If not suppressed, return the same unit: >>> from humanize.time import _suitable_minimum_unit, Unit >>> _suitable_minimum_unit(Unit.HOURS, []).name 'HOURS' But if suppressed, find a unit greater than the original one that is not suppressed: >>> _suitable_minimum_unit(Unit.HOURS, [Unit.HOURS]).name 'DAYS' >>> _suitable_minimum_unit(Unit.HOURS, [Unit.HOURS, Unit.DAYS]).name 'MONTHS' """ if min_unit in suppress: for unit in Unit: if unit > min_unit and unit not in suppress: return unit msg = "Minimum unit is suppressed and no suitable replacement was found" raise ValueError(msg) return min_unit def _suppress_lower_units(min_unit: Unit, suppress: typing.Iterable[Unit]) -> set[Unit]: """Extend suppressed units (if any) with all units lower than the minimum unit. >>> from humanize.time import _suppress_lower_units, Unit >>> [x.name for x in sorted(_suppress_lower_units(Unit.SECONDS, [Unit.DAYS]))] ['MICROSECONDS', 'MILLISECONDS', 'DAYS'] """ suppress = set(suppress) for unit in Unit: if unit == min_unit: break suppress.add(unit) return suppress def precisedelta( value: dt.timedelta | int | None, minimum_unit: str = "seconds", suppress: typing.Iterable[str] = (), format: str = "%0.2f", ) -> str: """Return a precise representation of a timedelta. ```pycon >>> import datetime as dt >>> from humanize.time import precisedelta >>> delta = dt.timedelta(seconds=3633, days=2, microseconds=123000) >>> precisedelta(delta) '2 days, 1 hour and 33.12 seconds' ``` A custom `format` can be specified to control how the fractional part is represented: ```pycon >>> precisedelta(delta, format="%0.4f") '2 days, 1 hour and 33.1230 seconds' ``` Instead, the `minimum_unit` can be changed to have a better resolution; the function will still readjust the unit to use the greatest of the units that does not lose precision. For example setting microseconds but still representing the date with milliseconds: ```pycon >>> precisedelta(delta, minimum_unit="microseconds") '2 days, 1 hour, 33 seconds and 123 milliseconds' ``` If desired, some units can be suppressed: you will not see them represented and the time of the other units will be adjusted to keep representing the same timedelta: ```pycon >>> precisedelta(delta, suppress=['days']) '49 hours and 33.12 seconds' ``` Note that microseconds precision is lost if the seconds and all the units below are suppressed: ```pycon >>> delta = dt.timedelta(seconds=90, microseconds=100) >>> precisedelta(delta, suppress=['seconds', 'milliseconds', 'microseconds']) '1.50 minutes' ``` If the delta is too small to be represented with the minimum unit, a value of zero will be returned: ```pycon >>> delta = dt.timedelta(seconds=1) >>> precisedelta(delta, minimum_unit="minutes") '0.02 minutes' >>> delta = dt.timedelta(seconds=0.1) >>> precisedelta(delta, minimum_unit="minutes") '0 minutes' ``` """ date, delta = _date_and_delta(value) if date is None: return str(value) suppress_set = {Unit[s.upper()] for s in suppress} # Find a suitable minimum unit (it can be greater the one that the # user gave us if it is suppressed). min_unit = Unit[minimum_unit.upper()] min_unit = _suitable_minimum_unit(min_unit, suppress_set) del minimum_unit # Expand the suppressed units list/set to include all the units # that are below the minimum unit suppress_set = _suppress_lower_units(min_unit, suppress_set) # handy aliases days = delta.days secs = delta.seconds usecs = delta.microseconds MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS, MONTHS, YEARS = list( Unit ) # Given DAYS compute YEARS and the remainder of DAYS as follows: # if YEARS is the minimum unit, we cannot use DAYS so # we will use a float for YEARS and 0 for DAYS: # years, days = years/days, 0 # # if YEARS is suppressed, use DAYS: # years, days = 0, days # # otherwise: # years, days = divmod(years, days) # # The same applies for months, hours, minutes and milliseconds below years, days = _quotient_and_remainder(days, 365, YEARS, min_unit, suppress_set) months, days = _quotient_and_remainder(days, 30.5, MONTHS, min_unit, suppress_set) # If DAYS is not in suppress, we can represent the days but # if it is a suppressed unit, we need to carry it to a lower unit, # seconds in this case. # # The same applies for secs and usecs below days, secs = _carry(days, secs, 24 * 3600, DAYS, min_unit, suppress_set) hours, secs = _quotient_and_remainder(secs, 3600, HOURS, min_unit, suppress_set) minutes, secs = _quotient_and_remainder(secs, 60, MINUTES, min_unit, suppress_set) secs, usecs = _carry(secs, usecs, 1e6, SECONDS, min_unit, suppress_set) msecs, usecs = _quotient_and_remainder( usecs, 1000, MILLISECONDS, min_unit, suppress_set ) # if _unused != 0 we had lost some precision usecs, _unused = _carry(usecs, 0, 1, MICROSECONDS, min_unit, suppress_set) fmts = [ ("%d year", "%d years", years), ("%d month", "%d months", months), ("%d day", "%d days", days), ("%d hour", "%d hours", hours), ("%d minute", "%d minutes", minutes), ("%d second", "%d seconds", secs), ("%d millisecond", "%d milliseconds", msecs), ("%d microsecond", "%d microseconds", usecs), ] texts: list[str] = [] for unit, fmt in zip(reversed(Unit), fmts): singular_txt, plural_txt, fmt_value = fmt if fmt_value > 0 or (not texts and unit == min_unit): _fmt_value = 2 if 1 < fmt_value < 2 else int(fmt_value) fmt_txt = _ngettext(singular_txt, plural_txt, _fmt_value) if unit == min_unit and math.modf(fmt_value)[0] > 0: fmt_txt = fmt_txt.replace("%d", format) elif unit == YEARS: fmt_txt = fmt_txt.replace("%d", "%s") texts.append(fmt_txt % intcomma(fmt_value)) continue texts.append(fmt_txt % fmt_value) if unit == min_unit: break if len(texts) == 1: return texts[0] head = ", ".join(texts[:-1]) tail = texts[-1] return _("%s and %s") % (head, tail)
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