How to use the vyper.ast.VyperNode function in vyper

__slots__ = ('names', )


class Call(VyperNode):
    __slots__ = ('func', 'args', 'keywords', 'keyword')


class keyword(VyperNode):
    __slots__ = ('arg', 'value')


class Str(VyperNode):
    __slots__ = ('s', )


class Compare(VyperNode):
    __slots__ = ('comparators', 'ops', 'left', 'right')


class Num(VyperNode):
    __slots__ = ('n', )


class NameConstant(VyperNode):
    __slots__ = ('value', )


class Attribute(VyperNode):
    __slots__ = ('attr', 'value',)


class Op(VyperNode):

__slots__ = ()


class AnnAssign(VyperNode):
    __slots__ = ('target', 'annotation', 'value', 'simple')


class Assign(VyperNode):
    __slots__ = ('targets', 'value')


class If(VyperNode):
    __slots__ = ('test', 'body', 'orelse')


class Assert(VyperNode):
    __slots__ = ('test', 'msg')


class For(VyperNode):
    __slots__ = ('iter', 'target', 'body')
    only_empty_fields = ('orelse', )


class AugAssign(VyperNode):
    __slots__ = ('op', 'target', 'value')


class Break(VyperNode):
    __slots__ = ()

__slots__ = ('keys', 'values')


class Bytes(VyperNode):
    __slots__ = ('s', )


class Add(VyperNode):
    __slots__ = ()


class Sub(VyperNode):
    __slots__ = ()


class Mult(VyperNode):
    __slots__ = ()


class Div(VyperNode):
    __slots__ = ()


class Mod(VyperNode):
    __slots__ = ()


class Pow(VyperNode):
    __slots__ = ()


class In(VyperNode):

__slots__ = ('elts', )


class Dict(VyperNode):
    __slots__ = ('keys', 'values')


class Bytes(VyperNode):
    __slots__ = ('s', )


class Add(VyperNode):
    __slots__ = ()


class Sub(VyperNode):
    __slots__ = ()


class Mult(VyperNode):
    __slots__ = ()


class Div(VyperNode):
    __slots__ = ()


class Mod(VyperNode):
    __slots__ = ()


class Pow(VyperNode):

class Tuple(VyperNode):
    __slots__ = ('elts', )


class FunctionDef(VyperNode):
    __slots__ = ('args', 'body', 'returns', 'name', 'decorator_list', 'pos')


class arguments(VyperNode):
    __slots__ = ('args', 'defaults', 'default')
    only_empty_fields = ('vararg', 'kwonlyargs', 'kwarg', 'kw_defaults')


class Import(VyperNode):
    __slots__ = ('names', )


class Call(VyperNode):
    __slots__ = ('func', 'args', 'keywords', 'keyword')


class keyword(VyperNode):
    __slots__ = ('arg', 'value')


class Str(VyperNode):
    __slots__ = ('s', )


class Compare(VyperNode):

__slots__ = ()


class Sub(VyperNode):
    __slots__ = ()


class Mult(VyperNode):
    __slots__ = ()


class Div(VyperNode):
    __slots__ = ()


class Mod(VyperNode):
    __slots__ = ()


class Pow(VyperNode):
    __slots__ = ()


class In(VyperNode):
    __slots__ = ()


class Gt(VyperNode):
    __slots__ = ()


class GtE(VyperNode):

__slots__ = ('class_type', 'name', 'body')


class Raise(VyperNode):
    __slots__ = ('exc', )


class Slice(VyperNode):
    only_empty_fields = ('lower', )


class alias(VyperNode):
    __slots__ = ('name', 'asname')


class ImportFrom(VyperNode):
    __slots__ = ('level', 'module', 'names')

__slots__ = ('target', 'annotation', 'value', 'simple')


class Assign(VyperNode):
    __slots__ = ('targets', 'value')


class If(VyperNode):
    __slots__ = ('test', 'body', 'orelse')


class Assert(VyperNode):
    __slots__ = ('test', 'msg')


class For(VyperNode):
    __slots__ = ('iter', 'target', 'body')
    only_empty_fields = ('orelse', )


class AugAssign(VyperNode):
    __slots__ = ('op', 'target', 'value')


class Break(VyperNode):
    __slots__ = ()


class Continue(VyperNode):
    __slots__ = ()

__slots__ = ()


class And(VyperNode):
    __slots__ = ()


class Or(VyperNode):
    __slots__ = ()


class Not(VyperNode):
    __slots__ = ()


class USub(VyperNode):
    __slots__ = ()


class Expr(VyperNode):
    __slots__ = ('value', )


class Pass(VyperNode):
    __slots__ = ()


class AnnAssign(VyperNode):
    __slots__ = ('target', 'annotation', 'value', 'simple')


class Assign(VyperNode):

class arguments(VyperNode):
    __slots__ = ('args', 'defaults', 'default')
    only_empty_fields = ('vararg', 'kwonlyargs', 'kwarg', 'kw_defaults')


class Import(VyperNode):
    __slots__ = ('names', )


class Call(VyperNode):
    __slots__ = ('func', 'args', 'keywords', 'keyword')


class keyword(VyperNode):
    __slots__ = ('arg', 'value')


class Str(VyperNode):
    __slots__ = ('s', )


class Compare(VyperNode):
    __slots__ = ('comparators', 'ops', 'left', 'right')


class Num(VyperNode):
    __slots__ = ('n', )


class NameConstant(VyperNode):