How to use the yapf.yapflib.format_token.Subtype function in yapf

def Visit_comp_for(self, node):  # pylint: disable=invalid-name
    # comp_for ::= 'for' exprlist 'in' testlist_safe [comp_iter]
    _AppendSubtypeRec(node, format_token.Subtype.COMP_FOR)
    # Mark the previous node as COMP_EXPR unless this is a nested comprehension
    # as these will have the outer comprehension as their previous node.
    attr = pytree_utils.GetNodeAnnotation(node.parent,
                                          pytree_utils.Annotation.SUBTYPE)
    if not attr or format_token.Subtype.COMP_FOR not in attr:
      _AppendSubtypeRec(node.parent.children[0], format_token.Subtype.COMP_EXPR)
    self.DefaultNodeVisit(node)

def Visit_comp_for(self, node):  # pylint: disable=invalid-name
    # comp_for ::= 'for' exprlist 'in' testlist_safe [comp_iter]
    _AppendSubtypeRec(node, format_token.Subtype.COMP_FOR)
    # Mark the previous node as COMP_EXPR unless this is a nested comprehension
    # as these will have the outer comprehension as their previous node.
    attr = pytree_utils.GetNodeAnnotation(node.parent,
                                          pytree_utils.Annotation.SUBTYPE)
    if not attr or format_token.Subtype.COMP_FOR not in attr:
      _AppendSubtypeRec(node.parent.children[0], format_token.Subtype.COMP_EXPR)
    self.DefaultNodeVisit(node)

#     ]
        if (style.Get('SPLIT_COMPLEX_COMPREHENSION') and
            top_of_stack.has_split_at_for != newline and
            (top_of_stack.has_split_at_for or
             not top_of_stack.HasTrivialExpr())):
          penalty += split_penalty.UNBREAKABLE
      else:
        top_of_stack.for_token = current
        top_of_stack.has_split_at_for = newline

        # Try to keep trivial expressions on the same line as the comp_for.
        if (style.Get('SPLIT_COMPLEX_COMPREHENSION') and newline and
            top_of_stack.HasTrivialExpr()):
          penalty += split_penalty.CONNECTED

    if (format_token.Subtype.COMP_IF in current.subtypes and
        format_token.Subtype.COMP_IF not in previous.subtypes):
      # Penalize breaking at comp_if when it doesn't match the newline structure
      # in the rest of the comprehension.
      if (style.Get('SPLIT_COMPLEX_COMPREHENSION') and
          top_of_stack.has_split_at_for != newline and
          (top_of_stack.has_split_at_for or not top_of_stack.HasTrivialExpr())):
        penalty += split_penalty.UNBREAKABLE

    return penalty

# Lightly penalize comprehensions that are split across multiple lines.
        if last.has_interior_split:
          penalty += style.Get('SPLIT_PENALTY_COMPREHENSION')

        return penalty

      if newline:
        top_of_stack.has_interior_split = True

    if (format_token.Subtype.COMP_EXPR in current.subtypes and
        format_token.Subtype.COMP_EXPR not in previous.subtypes):
      self.comp_stack.append(object_state.ComprehensionState(current))
      return penalty

    if (current.value == 'for' and
        format_token.Subtype.COMP_FOR in current.subtypes):
      if top_of_stack.for_token is not None:
        # Treat nested comprehensions like normal comp_if expressions.
        # Example:
        #     my_comp = [
        #         a.qux + b.qux
        #         for a in foo
        #   -->   for b in bar   <--
        #         if a.zut + b.zut
        #     ]
        if (style.Get('SPLIT_COMPLEX_COMPREHENSION') and
            top_of_stack.has_split_at_for != newline and
            (top_of_stack.has_split_at_for or
             not top_of_stack.HasTrivialExpr())):
          penalty += split_penalty.UNBREAKABLE
      else:
        top_of_stack.for_token = current

return True
    else:
      return True
  if (_IsUnaryOperator(left) and lval != 'not' and
      (right.is_name or right.is_number or rval == '(')):
    # The previous token was a unary op. No space is desired between it and
    # the current token.
    return False
  if (format_token.Subtype.DEFAULT_OR_NAMED_ASSIGN in left.subtypes or
      format_token.Subtype.DEFAULT_OR_NAMED_ASSIGN in right.subtypes):
    # A named argument or default parameter shouldn't have spaces around it.
    return style.Get('SPACES_AROUND_DEFAULT_OR_NAMED_ASSIGN')
  if (format_token.Subtype.VARARGS_LIST in left.subtypes or
      format_token.Subtype.VARARGS_LIST in right.subtypes):
    return False
  if (format_token.Subtype.VARARGS_STAR in left.subtypes or
      format_token.Subtype.KWARGS_STAR_STAR in left.subtypes):
    # Don't add a space after a vararg's star or a keyword's star-star.
    return False
  if lval == '@' and format_token.Subtype.DECORATOR in left.subtypes:
    # Decorators shouldn't be separated from the 'at' sign.
    return False
  if left.is_keyword and rval == '.':
    # Add space between keywords and dots.
    return lval != 'None' and lval != 'print'
  if lval == '.' and right.is_keyword:
    # Add space between keywords and dots.
    return rval != 'None' and rval != 'print'
  if lval == '.' or rval == '.':
    # Don't place spaces between dots.
    return False
  if ((lval == '(' and rval == ')') or (lval == '[' and rval == ']') or

if cval == ':':
    # Don't break before the start of a block of code.
    return False
  if cval == ',':
    # Don't break before a comma.
    return False
  if prev_token.is_name and cval == '(':
    # Don't break in the middle of a function definition or call.
    return False
  if prev_token.is_name and cval == '[':
    # Don't break in the middle of an array dereference.
    return False
  if cur_token.is_comment and prev_token.lineno == cur_token.lineno:
    # Don't break a comment at the end of the line.
    return False
  if format_token.Subtype.UNARY_OPERATOR in prev_token.subtypes:
    # Don't break after a unary token.
    return False
  if not style.Get('ALLOW_SPLIT_BEFORE_DEFAULT_OR_NAMED_ASSIGNS'):
    if (format_token.Subtype.DEFAULT_OR_NAMED_ASSIGN in cur_token.subtypes or
        format_token.Subtype.DEFAULT_OR_NAMED_ASSIGN in prev_token.subtypes):
      return False
  return True

(right.is_name or right.is_number or rval == '(')):
    # The previous token was a unary op. No space is desired between it and
    # the current token.
    return False
  if (format_token.Subtype.DEFAULT_OR_NAMED_ASSIGN in left.subtypes or
      format_token.Subtype.DEFAULT_OR_NAMED_ASSIGN in right.subtypes):
    # A named argument or default parameter shouldn't have spaces around it.
    return style.Get('SPACES_AROUND_DEFAULT_OR_NAMED_ASSIGN')
  if (format_token.Subtype.VARARGS_LIST in left.subtypes or
      format_token.Subtype.VARARGS_LIST in right.subtypes):
    return False
  if (format_token.Subtype.VARARGS_STAR in left.subtypes or
      format_token.Subtype.KWARGS_STAR_STAR in left.subtypes):
    # Don't add a space after a vararg's star or a keyword's star-star.
    return False
  if lval == '@' and format_token.Subtype.DECORATOR in left.subtypes:
    # Decorators shouldn't be separated from the 'at' sign.
    return False
  if left.is_keyword and rval == '.':
    # Add space between keywords and dots.
    return lval != 'None' and lval != 'print'
  if lval == '.' and right.is_keyword:
    # Add space between keywords and dots.
    return rval != 'None' and rval != 'print'
  if lval == '.' or rval == '.':
    # Don't place spaces between dots.
    return False
  if ((lval == '(' and rval == ')') or (lval == '[' and rval == ']') or
      (lval == '{' and rval == '}')):
    # Empty objects shouldn't be separated by spaces.
    return False
  if (lval in pytree_utils.OPENING_BRACKETS and

def is_m_expr_op(self):
    """Token is an m_expr operator."""
    return Subtype.M_EXPR_OPERATOR in self.subtypes

func_stack = []
  param_stack = []
  for tok in uwline.tokens:
    # Identify parameter list objects.
    if format_token.Subtype.FUNC_DEF in tok.subtypes:
      assert tok.next_token.value == '('
      func_stack.append(tok.next_token)
      continue

    if func_stack and tok.value == ')':
      if tok == func_stack[-1].matching_bracket:
        func_stack.pop()
      continue

    # Identify parameter objects.
    if format_token.Subtype.PARAMETER_START in tok.subtypes:
      param_stack.append(tok)

    # Not "elif", a parameter could be a single token.
    if param_stack and format_token.Subtype.PARAMETER_STOP in tok.subtypes:
      start = param_stack.pop()
      func_stack[-1].parameters.append(object_state.Parameter(start, tok))