58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
from datetime import timedelta
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SCALES = [
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('minutes', timedelta(minutes=1)),
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('hours', timedelta(hours=1)),
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('days', timedelta(days=1)),
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('weeks', timedelta(days=7)),
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('months', timedelta(days=30)),
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('years', timedelta(days=365)),
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]
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def decompose_interval(attrname):
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scales = [scale[1] for scale in SCALES]
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scales.reverse()
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def decorator(cls):
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scl_name = '{}_scale'.format(attrname)
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sig_name = '{}_significand'.format(attrname)
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@property
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def scale(self):
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if getattr(self, attrname) == timedelta(0):
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return timedelta(minutes=1)
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for m in scales:
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if getattr(self, attrname) % m == timedelta(0):
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return m
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return timedelta(minutes=1)
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@scale.setter
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def scale(self, value):
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if(type(value) != timedelta):
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value = timedelta(seconds=float(value))
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setattr(self, attrname, getattr(self, sig_name) * value)
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@property
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def significand(self):
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return int(getattr(self, attrname) / getattr(self, scl_name))
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@significand.setter
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def significand(self, value):
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try:
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value = int(value)
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assert value >= 0
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except (ValueError, AssertionError):
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raise ValueError("Incorrect time interval")
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setattr(self, attrname, value * getattr(self, scl_name))
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setattr(cls, scl_name, scale)
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setattr(cls, sig_name, significand)
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return cls
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return decorator
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