offsets.py 文件源码

def __init__(self, n=1, normalize=False, **kwds):
        self.month = kwds.get('month', self._default_month)

        if self.month < 1 or self.month > 12:
            raise ValueError('Month must go from 1 to 12')

        DateOffset.__init__(self, n=n, normalize=normalize, **kwds)