How to use the yapf.yapflib.style.Get function in yapf

def Visit_or_test(self, node):  # pylint: disable=invalid-name
    # or_test ::= and_test ('or' and_test)*
    self.DefaultNodeVisit(node)
    _IncreasePenalty(node, OR_TEST)
    index = 1
    while index + 1 < len(node.children):
      if style.Get('SPLIT_BEFORE_LOGICAL_OPERATOR'):
        _DecrementSplitPenalty(
            pytree_utils.FirstLeafNode(node.children[index]), OR_TEST)
      else:
        _DecrementSplitPenalty(
            pytree_utils.FirstLeafNode(node.children[index + 1]), OR_TEST)
      index += 2

def Visit_comp_if(self, node):  # pylint: disable=invalid-name
    # comp_if ::= 'if' old_test [comp_iter]
    _SetSplitPenalty(node.children[0],
                     style.Get('SPLIT_PENALTY_BEFORE_IF_EXPR'))
    _SetStronglyConnected(*node.children[1:])
    self.DefaultNodeVisit(node)

# TODO(morbo): Create a knob that can tune these.
  if prev_uwline is None:
    # The first line in the file. Don't add blank lines.
    # FIXME(morbo): Is this correct?
    if first_token.newlines is not None:
      pytree_utils.SetNodeAnnotation(first_token.node,
                                     pytree_utils.Annotation.NEWLINES, None)
    return 0

  if first_token.is_docstring:
    if (prev_uwline.first.value == 'class' and
        style.Get('BLANK_LINE_BEFORE_CLASS_DOCSTRING')):
      # Enforce a blank line before a class's docstring.
      return ONE_BLANK_LINE
    elif (prev_uwline.first.value.startswith('#') and
          style.Get('BLANK_LINE_BEFORE_MODULE_DOCSTRING')):
      # Enforce a blank line before a module's docstring.
      return ONE_BLANK_LINE
    # The docstring shouldn't have a newline before it.
    return NO_BLANK_LINES

  prev_last_token = prev_uwline.last
  if prev_last_token.is_docstring:
    if (not indent_depth and first_token.value in {'class', 'def', 'async'}):
      # Separate a class or function from the module-level docstring with
      # appropriate number of blank lines.
      return 1 + style.Get('BLANK_LINES_AROUND_TOP_LEVEL_DEFINITION')
    if (first_nested and
        not style.Get('BLANK_LINE_BEFORE_NESTED_CLASS_OR_DEF') and
        _IsClassOrDef(first_token)):
      pytree_utils.SetNodeAnnotation(first_token.node,
                                     pytree_utils.Annotation.NEWLINES, None)

def _SetExpressionOperandPenalty(node, ops):
  for index in py3compat.range(1, len(node.children) - 1):
    child = node.children[index]
    if pytree_utils.NodeName(child) in ops:
      if style.Get('SPLIT_BEFORE_ARITHMETIC_OPERATOR'):
        _SetSplitPenalty(child, style.Get('SPLIT_PENALTY_ARITHMETIC_OPERATOR'))
      else:
        _SetSplitPenalty(
            pytree_utils.FirstLeafNode(node.children[index + 1]),
            style.Get('SPLIT_PENALTY_ARITHMETIC_OPERATOR'))

#         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
        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

def _LineContainsI18n(uwline):
  """Return true if there are i18n comments or function calls in the line.

  I18n comments and pseudo-function calls are closely related. They cannot
  be moved apart without breaking i18n.

  Arguments:
    uwline: (unwrapped_line.UnwrappedLine) The line currently being formatted.

  Returns:
    True if the line contains i18n comments or function calls. False otherwise.
  """
  if style.Get('I18N_COMMENT'):
    for tok in uwline.tokens:
      if tok.is_comment and re.match(style.Get('I18N_COMMENT'), tok.value):
        # Contains an i18n comment.
        return True

  if style.Get('I18N_FUNCTION_CALL'):
    length = len(uwline.tokens)
    index = 0
    while index < length - 1:
      if (uwline.tokens[index + 1].value == '(' and
          uwline.tokens[index].value in style.Get('I18N_FUNCTION_CALL')):
        return True
      index += 1

  return False

current.AddWhitespacePrefix(newlines_before=0, spaces=spaces)

    if previous.OpensScope():
      if not current.is_comment:
        # Align closing scopes that are on a newline with the opening scope:
        #
        #     foo = [a,
        #            b,
        #           ]
        self.stack[-1].closing_scope_indent = self.column - 1
        if style.Get('ALIGN_CLOSING_BRACKET_WITH_VISUAL_INDENT'):
          self.stack[-1].closing_scope_indent += 1
        self.stack[-1].indent = self.column + spaces
      else:
        self.stack[-1].closing_scope_indent = (
            self.stack[-1].indent - style.Get('CONTINUATION_INDENT_WIDTH'))

    self.column += spaces

return ONE_BLANK_LINE
    elif (prev_uwline.first.value.startswith('#') and
          style.Get('BLANK_LINE_BEFORE_MODULE_DOCSTRING')):
      # Enforce a blank line before a module's docstring.
      return ONE_BLANK_LINE
    # The docstring shouldn't have a newline before it.
    return NO_BLANK_LINES

  prev_last_token = prev_uwline.last
  if prev_last_token.is_docstring:
    if (not indent_depth and first_token.value in {'class', 'def', 'async'}):
      # Separate a class or function from the module-level docstring with
      # appropriate number of blank lines.
      return 1 + style.Get('BLANK_LINES_AROUND_TOP_LEVEL_DEFINITION')
    if (first_nested and
        not style.Get('BLANK_LINE_BEFORE_NESTED_CLASS_OR_DEF') and
        _IsClassOrDef(first_token)):
      pytree_utils.SetNodeAnnotation(first_token.node,
                                     pytree_utils.Annotation.NEWLINES, None)
      return NO_BLANK_LINES
    if _NoBlankLinesBeforeCurrentToken(prev_last_token.value, first_token,
                                       prev_last_token):
      return NO_BLANK_LINES
    else:
      return ONE_BLANK_LINE

  if _IsClassOrDef(first_token):
    # TODO(morbo): This can go once the blank line calculator is more
    # sophisticated.
    if not indent_depth:
      # This is a top-level class or function.
      is_inline_comment = prev_last_token.whitespace_prefix.count('\n') == 0

# Prefer to split before 'and' and 'or'.
    if pval in _LOGICAL_OPERATORS:
      return style.Get('SPLIT_PENALTY_LOGICAL_OPERATOR')
    if cval in _LOGICAL_OPERATORS:
      return 0
  else:
    # Prefer to split after 'and' and 'or'.
    if pval in _LOGICAL_OPERATORS:
      return 0
    if cval in _LOGICAL_OPERATORS:
      return style.Get('SPLIT_PENALTY_LOGICAL_OPERATOR')

  if style.Get('SPLIT_BEFORE_BITWISE_OPERATOR'):
    # Prefer to split before '&', '|', and '^'.
    if pval in _BITWISE_OPERATORS:
      return style.Get('SPLIT_PENALTY_BITWISE_OPERATOR')
    if cval in _BITWISE_OPERATORS:
      return 0
  else:
    # Prefer to split after '&', '|', and '^'.
    if pval in _BITWISE_OPERATORS:
      return 0
    if cval in _BITWISE_OPERATORS:
      return style.Get('SPLIT_PENALTY_BITWISE_OPERATOR')

  if (format_token.Subtype.COMP_FOR in cur_token.subtypes or
      format_token.Subtype.COMP_IF in cur_token.subtypes):
    # We don't mind breaking before the 'for' or 'if' of a list comprehension.
    return 0
  if format_token.Subtype.UNARY_OPERATOR in prev_token.subtypes:
    # Try not to break after a unary operator.
    return style.Get('SPLIT_PENALTY_AFTER_UNARY_OPERATOR')