class_docstr: Applies various transformations to a cell or code block.
  
  The key methods for external use are ``transform_cell()``
  and ``check_complete()``.
class_docstr_tok: ["Applies","various","transformations","to","a","cell","or","code","block",".","The","key","methods","for","external","use","are","``","transform_cell","(",")","``","and","``","check_complete","(",")","``","."]
code: def __init__(self):
      self.cleanup_transforms = [
          leading_empty_lines,
          leading_indent,
          classic_prompt,
          ipython_prompt,
      ]
      self.line_transforms = [
          cell_magic,
      ]
      self.token_transformers = [
          MagicAssign,
          SystemAssign,
          EscapedCommand,
          HelpEnd,
      ]
  
imports: import ast
  from codeop import CommandCompiler, Compile
  import re
  import sys
  import tokenize
  from typing import List, Tuple, Optional, Any
  import warnings
  from IPython.utils import tokenutil
label_desc: Use image node_id 1 to create a new TransformerManager object  with example: obj = TransformerManager()