class_docstr: The main matcher class. After instantiating the patterns should
  be added using the add_fixer method
code: def __init__(self):
      self.match = set()
      self.root = BMNode()
      self.nodes = [self.root]
      self.fixers = []
      self.logger = logging.getLogger("RefactoringTool")
  
file_path: catboost/contrib/tools/python/src/Lib/lib2to3/btm_matcher.py
imports: import logging
  import itertools
  from collections import defaultdict
  from .None import pytree
  from .btm_utils import reduce_tree
label_desc: Use image node_id 1 to create a new BottomMatcher object from inherited base classes: object with example: obj = BottomMatcher()