How to use the libcst._nodes.whitespace.SimpleWhitespace.field function in libcst

#: Sequence of :class:`Dot` nodes indicating relative import level.
    relative: Sequence[Dot] = ()

    #: Optional open parenthesis for multi-line import continuation.
    lpar: Optional[LeftParen] = None

    #: Optional close parenthesis for multi-line import continuation.
    rpar: Optional[RightParen] = None

    #: Optional semicolon when this is used in a statement line. This semicolon
    #: owns the whitespace on both sides of it when it is used.
    semicolon: Union[Semicolon, MaybeSentinel] = MaybeSentinel.DEFAULT

    #: The whitespace that appears after the ``from`` keyword but before
    #: the module and any relative import dots.
    whitespace_after_from: SimpleWhitespace = SimpleWhitespace.field(" ")

    #: The whitespace that appears after the module but before the
    #: ``import`` keyword.
    whitespace_before_import: SimpleWhitespace = SimpleWhitespace.field(" ")

    #: The whitespace that appears after the ``import`` keyword but
    #: before the first import name or optional left paren.
    whitespace_after_import: SimpleWhitespace = SimpleWhitespace.field(" ")

    def _validate_module(self) -> None:
        if self.module is None and len(self.relative) == 0:
            raise CSTValidationError(
                "Must have a module specified if there is no relative import."
            )

    def _validate_names(self) -> None:

...


@add_slots
@dataclass(frozen=True)
class Del(BaseSmallStatement):
    """
    Represents a ``del`` statement. ``del`` is always followed by a target.
    """

    #: The target expression will be deleted. This can be a name, a tuple,
    #: an item of a list, an item of a dictionary, or an attribute.
    target: BaseDelTargetExpression

    #: The whitespace after the ``del`` keyword.
    whitespace_after_del: SimpleWhitespace = SimpleWhitespace.field(" ")

    #: Optional semicolon when this is used in a statement line. This semicolon
    #: owns the whitespace on both sides of it when it is used.
    semicolon: Union[Semicolon, MaybeSentinel] = MaybeSentinel.DEFAULT

    def _validate(self) -> None:
        if (
            self.whitespace_after_del.empty
            and not self.target._safe_to_use_with_word_operator(
                ExpressionPosition.RIGHT
            )
        ):
            raise CSTValidationError("Must have at least one space after 'del'.")

    def _visit_and_replace_children(self, visitor: CSTVisitorT) -> "Del":
        return Del(

:class:`TrailingWhitespace`. If you have whitespace that does not contain
    comments or newlines, use :class:`SimpleWhitespace` instead.
    """

    #: The whitespace that comes after the previous node, up to and including
    #: the end-of-line comment and newline.
    first_line: TrailingWhitespace = TrailingWhitespace.field()

    #: Any lines after the first that contain only indentation and/or comments.
    empty_lines: Sequence[EmptyLine] = ()

    #: Whether or not the final simple whitespace is indented regularly.
    indent: bool = False

    #: Extra whitespace after the indent, but before the next node.
    last_line: SimpleWhitespace = SimpleWhitespace.field("")

    def _visit_and_replace_children(
        self, visitor: CSTVisitorT
    ) -> "ParenthesizedWhitespace":
        return ParenthesizedWhitespace(
            first_line=visit_required(self, "first_line", self.first_line, visitor),
            empty_lines=visit_sequence(self, "empty_lines", self.empty_lines, visitor),
            indent=self.indent,
            last_line=visit_required(self, "last_line", self.last_line, visitor),
        )

    def _codegen_impl(self, state: CodegenState) -> None:
        self.first_line._codegen(state)
        for line in self.empty_lines:
            line._codegen(state)
        if self.indent:

#: Optional async modifier, if this is an async function.
    asynchronous: Optional[Asynchronous] = None

    #: Leading empty lines and comments before the first decorator. We
    #: assume any comments before the first decorator are owned by the
    #: function definition itself. If there are no decorators, this will
    #: still contain all of the empty lines and comments before the
    #: function definition.
    leading_lines: Sequence[EmptyLine] = ()

    #: Empty lines and comments between the final decorator and the
    #: :class:`FunctionDef` node. In the case of no decorators, this will be empty.
    lines_after_decorators: Sequence[EmptyLine] = ()

    #: Whitespace after the ``def`` keyword and before the function name.
    whitespace_after_def: SimpleWhitespace = SimpleWhitespace.field(" ")

    #: Whitespace after the function name and before the opening parenthesis for
    #: the parameters.
    whitespace_after_name: SimpleWhitespace = SimpleWhitespace.field("")

    #: Whitespace after the opening parenthesis for the parameters but before
    #: the first param itself.
    whitespace_before_params: SimpleWhitespace = SimpleWhitespace.field("")

    #: Whitespace after the closing parenthesis or return annotation and before
    #: the colon.
    whitespace_before_colon: SimpleWhitespace = SimpleWhitespace.field("")

    def _validate(self) -> None:
        if len(self.name.lpar) > 0 or len(self.name.rpar) > 0:
            raise CSTValidationError("Cannot have parens around Name in a FunctionDef.")

#: The arguments to pass to the resulting callable. These may be a mix of
    #: positional arguments, keyword arguments, or "starred" arguments.
    args: Sequence[Arg] = ()

    lpar: Sequence[LeftParen] = ()
    #: Sequence of parenthesis for precedence dictation. These are not the parenthesis
    #: before and after the list of ``args``, but rather arguments around the entire
    #: call expression, such as ``(( do_math(1, 2) ))``.
    rpar: Sequence[RightParen] = ()

    #: Whitespace after the ``func`` name, but before the opening parenthesis.
    whitespace_after_func: BaseParenthesizableWhitespace = SimpleWhitespace.field("")
    #: Whitespace after the opening parenthesis but before the first argument (if there
    #: are any). Whitespace after the last argument but before the closing parenthesis
    #: is owned by the last :class:`Arg` if it exists.
    whitespace_before_args: BaseParenthesizableWhitespace = SimpleWhitespace.field("")

    def _safe_to_use_with_word_operator(self, position: ExpressionPosition) -> bool:
        """
        Calls have a close paren on the right side regardless of whether they're
        parenthesized as a whole. As a result, they are safe to use directly against
        an adjacent node to the right.
        """
        if position == ExpressionPosition.LEFT:
            return True
        if super(Call, self)._safe_to_use_with_word_operator(position):
            return True
        if position == ExpressionPosition.RIGHT:
            return self.func._safe_to_use_with_word_operator(ExpressionPosition.RIGHT)
        return False

    def _visit_and_replace_children(self, visitor: CSTVisitorT) -> "Call":

def _codegen_impl(self, state: CodegenState) -> None:
        self.whitespace_before._codegen(state)
        state.add_token("}")


@add_slots
@dataclass(frozen=True)
class LeftParen(CSTNode):
    """
    Used by various nodes to denote a parenthesized section. This doesn't own
    the whitespace to the left of it since this is owned by the parent node.
    """

    #: Any space that appears directly after this left parenthesis.
    whitespace_after: BaseParenthesizableWhitespace = SimpleWhitespace.field("")

    def _visit_and_replace_children(self, visitor: CSTVisitorT) -> "LeftParen":
        return LeftParen(
            whitespace_after=visit_required(
                self, "whitespace_after", self.whitespace_after, visitor
            )
        )

    def _codegen_impl(self, state: CodegenState) -> None:
        state.add_token("(")
        self.whitespace_after._codegen(state)


@add_slots
@dataclass(frozen=True)
class RightParen(CSTNode):

"""

    #: A sequence of one or more items that evaluate to context managers.
    items: Sequence[WithItem]

    #: The suite that is wrapped with this statement.
    body: BaseSuite

    #: Optional async modifier if this is an ``async with`` statement.
    asynchronous: Optional[Asynchronous] = None

    #: Sequence of empty lines appearing before this with statement.
    leading_lines: Sequence[EmptyLine] = ()

    #: Whitespace after the ``with`` keyword and before the first item.
    whitespace_after_with: SimpleWhitespace = SimpleWhitespace.field(" ")

    #: Whitespace after the last item and before the colon.
    whitespace_before_colon: SimpleWhitespace = SimpleWhitespace.field("")

    def _validate(self) -> None:
        if len(self.items) == 0:
            raise CSTValidationError(
                "A With statement must have at least one WithItem."
            )
        if self.items[-1].comma != MaybeSentinel.DEFAULT:
            raise CSTValidationError(
                "The last WithItem in a With cannot have a trailing comma."
            )
        if self.whitespace_after_with.empty and not self.items[
            0
        ].item._safe_to_use_with_word_operator(ExpressionPosition.RIGHT):

class CompIf(CSTNode):
    """
    A conditional clause in a :class:`CompFor`, used as part of a generator or
    comprehension expression.

    If the ``test`` fails, the current element in the :class:`CompFor` will be skipped.
    """

    #: An expression to evaluate. When interpreted, Python will coerce it to a boolean.
    test: BaseExpression

    #: Whitespace before the ``if`` keyword.
    whitespace_before: BaseParenthesizableWhitespace = SimpleWhitespace.field(" ")

    #: Whitespace after the ``if`` keyword, but before the ``test`` expression.
    whitespace_before_test: BaseParenthesizableWhitespace = SimpleWhitespace.field(" ")

    def _validate(self) -> None:
        if (
            self.whitespace_before_test.empty
            and not self.test._safe_to_use_with_word_operator(ExpressionPosition.RIGHT)
        ):
            raise CSTValidationError("Must have at least one space after 'if' keyword.")

    def _visit_and_replace_children(self, visitor: CSTVisitorT) -> "CompIf":
        return CompIf(
            whitespace_before=visit_required(
                self, "whitespace_before", self.whitespace_before, visitor
            ),
            whitespace_before_test=visit_required(
                self, "whitespace_before_test", self.whitespace_before_test, visitor
            ),

default: Optional[BaseExpression] = None

    #: A trailing comma. If one is not provided, :class:`MaybeSentinel` will be
    #: replaced with a comma only if a comma is required.
    comma: Union[Comma, MaybeSentinel] = MaybeSentinel.DEFAULT

    #: Zero, one, or two asterisks appearing before name for :class:`Param`'s
    #: ``star_arg`` and ``star_kwarg``.
    star: Union[str, MaybeSentinel] = MaybeSentinel.DEFAULT

    #: The whitespace before ``name``. It will appear after ``star`` when a star
    #: exists.
    whitespace_after_star: BaseParenthesizableWhitespace = SimpleWhitespace.field("")

    #: The whitespace after this entire node.
    whitespace_after_param: BaseParenthesizableWhitespace = SimpleWhitespace.field("")

    def _validate(self) -> None:
        if self.default is None and isinstance(self.equal, AssignEqual):
            raise CSTValidationError(
                "Must have a default when specifying an AssignEqual."
            )
        if isinstance(self.star, str) and self.star not in ("", "*", "**"):
            raise CSTValidationError("Must specify either '', '*' or '**' for star.")

    def _visit_and_replace_children(self, visitor: CSTVisitorT) -> "Param":
        return Param(
            star=self.star,
            whitespace_after_star=visit_required(
                self, "whitespace_after_star", self.whitespace_after_star, visitor
            ),
            name=visit_required(self, "name", self.name, visitor),

def _codegen_impl(self, state: CodegenState) -> None:
        self.whitespace_before._codegen(state)
        state.add_token(")")


@add_slots
@dataclass(frozen=True)
class Asynchronous(CSTNode):
    """
    Used by asynchronous function definitions, as well as ``async for`` and
    ``async with``.
    """

    #: Any space that appears directly after this async keyword.
    whitespace_after: SimpleWhitespace = SimpleWhitespace.field(" ")

    def _validate(self) -> None:
        if len(self.whitespace_after.value) < 1:
            raise CSTValidationError("Must have at least one space after Asynchronous.")

    def _visit_and_replace_children(self, visitor: CSTVisitorT) -> "Asynchronous":
        return Asynchronous(
            whitespace_after=visit_required(
                self, "whitespace_after", self.whitespace_after, visitor
            )
        )

    def _codegen_impl(self, state: CodegenState) -> None:
        with state.record_syntactic_position(self):
            state.add_token("async")
        self.whitespace_after._codegen(state)