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f3d633780f
String concatenation can at times be easier to read that format(). One should choose whichever approach is more readable.
131 lines
3.3 KiB
Python
131 lines
3.3 KiB
Python
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class Bytes(object):
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units = {'B': 1,
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'KiB': 1024,
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'MiB': 1024 * 1024,
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'GiB': 1024 * 1024 * 1024,
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'TiB': 1024 * 1024 * 1024 * 1024,
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}
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def __init__(self, qty):
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if isinstance(qty, (int, long)):
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self.qty = qty
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else:
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self.qty = Bytes.parse(qty)
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@staticmethod
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def parse(qty_str):
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import re
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regex = re.compile('^(?P<qty>\d+)(?P<unit>[KMGT]i?B|B)$')
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parsed = regex.match(qty_str)
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if parsed is None:
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raise UnitError('Unable to parse ' + qty_str)
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qty = int(parsed.group('qty'))
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unit = parsed.group('unit')
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if unit[0] in 'KMGT':
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unit = unit[0] + 'iB'
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byte_qty = qty * Bytes.units[unit]
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return byte_qty
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def get_qty_in(self, unit):
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if unit[0] in 'KMGT':
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unit = unit[0] + 'iB'
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if unit not in Bytes.units:
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raise UnitError('Unrecognized unit: ' + unit)
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if self.qty % Bytes.units[unit] != 0:
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msg = 'Unable to convert {qty} bytes to a whole number in {unit}'.format(qty=self.qty, unit=unit)
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raise UnitError(msg)
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return self.qty / Bytes.units[unit]
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def __repr__(self):
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converted = str(self.get_qty_in('B')) + 'B'
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if self.qty == 0:
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return converted
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for unit in ['TiB', 'GiB', 'MiB', 'KiB']:
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try:
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converted = str(self.get_qty_in(unit)) + unit
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break
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except UnitError:
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pass
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return converted
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def __str__(self):
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return self.__repr__()
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def __int__(self):
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return self.qty
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def __long__(self):
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return self.qty
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def __add__(self, other):
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if not isinstance(other, Bytes):
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raise UnitError('Can only add Bytes to Bytes')
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return Bytes(self.qty + other.qty)
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def __iadd__(self, other):
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if not isinstance(other, Bytes):
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raise UnitError('Can only add Bytes to Bytes')
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self.qty += other.qty
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return self
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def __sub__(self, other):
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if not isinstance(other, Bytes):
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raise UnitError('Can only subtract Bytes from Bytes')
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return Bytes(self.qty - other.qty)
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def __isub__(self, other):
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if not isinstance(other, Bytes):
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raise UnitError('Can only subtract Bytes from Bytes')
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self.qty -= other.qty
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return self
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def __mul__(self, other):
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if not isinstance(other, (int, long)):
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raise UnitError('Can only multiply Bytes with integers')
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return Bytes(self.qty * other)
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def __imul__(self, other):
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if not isinstance(other, (int, long)):
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raise UnitError('Can only multiply Bytes with integers')
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self.qty *= other
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return self
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def __div__(self, other):
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if isinstance(other, Bytes):
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return self.qty / other.qty
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if not isinstance(other, (int, long)):
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raise UnitError('Can only divide Bytes with integers or Bytes')
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return Bytes(self.qty / other)
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def __idiv__(self, other):
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if isinstance(other, Bytes):
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self.qty /= other.qty
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else:
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if not isinstance(other, (int, long)):
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raise UnitError('Can only divide Bytes with integers or Bytes')
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self.qty /= other
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return self
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def __mod__(self, other):
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if isinstance(other, Bytes):
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return self.qty % other.qty
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if not isinstance(other, (int, long)):
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raise UnitError('Can only take modulus of Bytes with integers or Bytes')
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return Bytes(self.qty % other)
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def __imod__(self, other):
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if isinstance(other, Bytes):
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self.qty %= other.qty
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else:
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if not isinstance(other, (int, long)):
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raise UnitError('Can only divide Bytes with integers or Bytes')
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self.qty %= other
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return self
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class UnitError(Exception):
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pass
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