old_contents: # coding: utf-8
  
  import os
  import traceback
  
  from .handlers import find_handler
  
  
  _activate_debugger = os.environ.get('DEBUG') == 'yes'
  if _activate_debugger:
      try:
          from trepan.api import debug
          set_trace = debug
      except ImportError:
          import pdb
          set_trace = pdb.set_trace
  
  
  def signal(e):
      """
      Some docstrings.
      """
      callback = find_handler(e)
      if callback is None:
          if _activate_debugger:
              print 'Handler for error {0} not found'.format(type(e))
              traceback.print_stack()
              set_trace()
          raise e
      else:
          return callback(e)
  
new_contents: # coding: utf-8
  
  from __future__ import print_function
  
  import os
  import traceback
  
  from .handlers import find_handler
  
  
  _activate_debugger = os.environ.get('DEBUG') == 'yes'
  if _activate_debugger:
      try:
          from trepan.api import debug
          set_trace = debug
      except ImportError:
          import pdb
          set_trace = pdb.set_trace
  
  
  def signal(e):
      """
      Some docstrings.
      """
      callback = find_handler(e)
      if callback is None:
          if _activate_debugger:
              print('Handler for error {0} not found'.format(type(e)))
              traceback.print_stack()
              set_trace()
          raise e
      else:
          return callback(e)
  
subject: Fix use of Python 2 print