class_docstr: A checker that finds error(s) should raise this with all the errors.
code: def __init__(self, errors):
      if not isinstance(errors, list):
          errors = [errors]
  
      self.errors = errors
  
imports: import argparse
  import commonmark
  import nbformat
  import os
  import re
  import subprocess
  import sys
  import textwrap
  from pathlib import Path
label_desc: Use image node_id 1 to create a new FormattingError object from inherited base classes: Exception with example: obj = FormattingError(errors)