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92 lines
2.3 KiB
92 lines
2.3 KiB
14 years ago
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"""
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This module contains several handy functions primarily meant for internal use.
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"""
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from datetime import date, datetime, timedelta
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from time import mktime
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__all__ = ('asint', 'asbool', 'convert_to_datetime', 'timedelta_seconds',
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'time_difference', 'datetime_ceil')
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def asint(text):
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"""
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Safely converts a string to an integer, returning None if the string
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is None.
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:type text: str
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:rtype: int
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"""
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if text is not None:
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return int(text)
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def asbool(obj):
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"""
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Interprets an object as a boolean value.
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:rtype: bool
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"""
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if isinstance(obj, str):
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obj = obj.strip().lower()
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if obj in ('true', 'yes', 'on', 'y', 't', '1'):
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return True
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if obj in ('false', 'no', 'off', 'n', 'f', '0'):
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return False
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raise ValueError('Unable to interpret value "%s" as boolean' % obj)
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return bool(obj)
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def convert_to_datetime(dateval):
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"""
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Converts a date object to a datetime object.
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If an actual datetime object is passed, it is returned unmodified.
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:type dateval: date
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:rtype: datetime
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"""
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if isinstance(dateval, datetime):
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return dateval
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elif isinstance(dateval, date):
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return datetime.fromordinal(dateval.toordinal())
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raise TypeError('Expected date, got %s instead' % type(dateval))
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def timedelta_seconds(delta):
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"""
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Converts the given timedelta to seconds.
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:type delta: timedelta
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:rtype: float
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"""
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return delta.days * 24 * 60 * 60 + delta.seconds + \
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delta.microseconds / 1000000.0
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def time_difference(date1, date2):
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"""
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Returns the time difference in seconds between the given two
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datetime objects. The difference is calculated as: date1 - date2.
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:param date1: the later datetime
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:type date1: datetime
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:param date2: the earlier datetime
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:type date2: datetime
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:rtype: float
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"""
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later = mktime(date1.timetuple())
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earlier = mktime(date2.timetuple())
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return int(later - earlier)
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def datetime_ceil(dateval):
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"""
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Rounds the given datetime object upwards.
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:type dateval: datetime
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"""
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if dateval.microsecond > 0:
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return dateval + timedelta(seconds=1,
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microseconds=-dateval.microsecond)
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return dateval
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