cron.py 文件源码

def __init__(self, *args, **keys):
        self._spec = {}

        max_priority = min(x.time_tuple_index for x in self._units.values())

        for key, arg in dict(*args, **keys).iteritems():
            if key not in self._units:
                raise TypeError("unexpected unit {0!r}".format(key))

            unit = self._units[key]
            max_priority = max(max_priority, unit.time_tuple_index)
            rangeobj = self._coerce(arg)
            self._spec[key] = unit.resolve(rangeobj)

        for key, unit in self._units.iteritems():
            if key in self._spec:
                continue

            if max_priority >= unit.time_tuple_index:
                self._spec[key] = unit.resolve(any())
            else:
                self._spec[key] = unit.resolve(value(unit.min))

        # Special case: If both day or weekday is limited, then use OR instead of AND.
        if self._is_any("day"):
            self._spec["day"] = self._units["day"].resolve(empty())
        elif self._is_any("weekday"):
            self._spec["weekday"] = self._units["weekday"].resolve(empty())
        self._spec["day"] = _ResolvedOr(self._spec.pop("day"), self._spec.pop("weekday"))