Class Period

quantdigger/kernel/datastruct.py:286–335

周期

class Period(object):
    """ 周期 """
    #class Type(Enum):
        #MilliSeconds = "MilliSeconds" 
        #Seconds = "Seconds" 
        #Minutes = "Minutes" 
        #Hours = "Hours" 
        #Days = "Days" 
        #Months = "Months" 
        #Seasons = "Seasons" 
        #Years = "Years" 
    periods = ["MilliSecond", "Second", "Minute", "Hour",
               "Day", "Month", "Season", "Year"]    

    def __init__(self, str_period):
        period = str_period.split('.')
        if len(period) == 2:
            unit_count = int(period[0])
            time_unit = period[1]
        else:
            raise PeriodTypeError
        if time_unit not in self.periods:
            raise PeriodTypeError

        self._type = time_unit
        self._length = unit_count

    @property
    def type(self):
        """
        时间单位。
        """
        return self._type

    @property
    def length(self):
        """
        时间长度。
        """
        return self._length

    def __str__(self):
        return "%d.%s" % (self._length, self._type)

    def __hash__(self):
        if hasattr(self, '_hash'):
            return self._hash
        else:
            self._hash =  hash(self.__str__())
            return self._hash


class PContract(object):