code: def assign_from_system(line):
      """Transform assignment from system commands (e.g. files = !ls)"""
      m = assign_system_re.match(line)
      if m is None:
          return line
  
      return assign_system_template % m.group("lhs", "cmd")
  
imports: import abc
  import functools
  import re
  import tokenize
  from tokenize import untokenize, TokenError
  from io import StringIO
  from IPython.core.splitinput import LineInfo
  from IPython.utils import tokenutil
label_desc: Use image node_id 20 for calling a global function with example usage: assign_from_system(line) and returns: unknown, line