# Source code for graphene.types.decimal

    from decimal import Decimal as _Decimal

    from graphql import Undefined
    from graphql.language.ast import StringValueNode, IntValueNode

    from .scalars import Scalar

    class Decimal(Scalar):
        """
        The `Decimal` scalar type represents a python Decimal.
        """

        @staticmethod
        def serialize(dec):
            if isinstance(dec, str):
                dec = _Decimal(dec)
            assert isinstance(
                dec, _Decimal
            ), f'Received not compatible Decimal "{repr(dec)}"'
            return str(dec)

        @classmethod
        def parse_literal(cls, node, _variables=None):
            if isinstance(node, (StringValueNode, IntValueNode)):
                return cls.parse_value(node.value)
            return Undefined

        @staticmethod
        def parse_value(value):
            try:
                return _Decimal(value)
            except Exception:
                return Undefined