code: def usage(msg=None):
      if msg is not None:
          print(msg, file=sys.stderr)
      print(__doc__, file=sys.stderr)
  
file_path: Theano/theano/misc/hooks/reindent.py
imports: from __future__ import absolute_import, print_function, division
  import tokenize
  import os, shutil
  import sys
  from six.moves import xrange
label_desc: Use image node_id 1 for calling a global function with example usage: usage(msg) without return types