stone_validators.py 文件源码

def __init__(self, min_value=None, max_value=None):
        """
        A more restrictive minimum or maximum value can be specified than the
        range inherent to the defined type.
        """
        if min_value is not None:
            assert isinstance(min_value, numbers.Real), \
                'min_value must be a real number'
            if not isinstance(min_value, float):
                try:
                    min_value = float(min_value)
                except OverflowError:
                    raise AssertionError('min_value is too small for a float')
            if self.minimum is not None and min_value < self.minimum:
                raise AssertionError('min_value cannot be less than the '
                                     'minimum value for this type (%f < %f)' %
                                     (min_value, self.minimum))
            self.minimum = min_value
        if max_value is not None:
            assert isinstance(max_value, numbers.Real), \
                'max_value must be a real number'
            if not isinstance(max_value, float):
                try:
                    max_value = float(max_value)
                except OverflowError:
                    raise AssertionError('max_value is too large for a float')
            if self.maximum is not None and max_value > self.maximum:
                raise AssertionError('max_value cannot be greater than the '
                                     'maximum value for this type (%f < %f)' %
                                     (max_value, self.maximum))
            self.maximum = max_value