stdtypes.py 文件源码

def _load_(self, value, context):
        if isinstance(value, decimal.Decimal):
            if not self.get_options().allow_nan and not value.is_finite():
                raise ValueError()
            return value
        elif isinstance(value, text_types):
            try:
                with decimal.localcontext() as ctx:
                    ctx.traps[decimal.InvalidOperation] = 1
                    value = decimal.Decimal(value)
                    if not self.get_options().allow_nan and not value.is_finite():
                        raise ValueError()
                    return value
            except decimal.InvalidOperation:
                raise ValueError()
        elif isinstance(value, integer_types):
            return decimal.Decimal(value)
        elif isinstance(value, float):
            if not self.get_options().allow_nan:
                if math.isnan(value) or math.isinf(value):
                    raise ValueError()
            return decimal.Decimal(value)
        else:
            raise ValueError()