old_contents: """Helpers for python 2/3 compatibility"""
  
  import sys
  
  PY2 = sys.version_info[0] == 2
  
  
  if not PY2:
      from configparser import ConfigParser
  else:
      from ConfigParser import ConfigParser
  
  if not PY2:
      from urllib.parse import quote as url_quote, unquote as url_unquote
      from urllib.parse import quote_plus, unquote_plus
  
  else:
      from urllib import quote as url_quote
      from urllib import unquote as url_unquote
      from urllib import quote_plus, unquote_plus
  
  if not PY2:
      from urllib.parse import urlparse
  else:
      from urlparse import urlparse
  
  if not PY2:
      imap = map
      ifilter = filter
  else:
      from itertools import imap
      from itertools import ifilter
  
  
  if not PY2:
      from io import BytesIO
  else:
      from cStringIO import StringIO as BytesIO
  
  if not PY2:
      import pickle
      import copyreg
  else:
      try:
          import cPickle as pickle
          import copy_reg as copyreg
      except ImportError:
          import pickle
  
  xrange = range if not PY2 else xrange
  
  if not PY2:
      text_type = str
      unichr = chr
      binary_type = bytes
  else:
      text_type = unicode
      unichr = unichr
      binary_type = str
  
new_contents: """Helpers for python 2/3 compatibility"""
  
  import sys
  
  PY2 = sys.version_info[0] == 2
  
  
  if not PY2:
      from configparser import ConfigParser
  else:
      from ConfigParser import ConfigParser
  
  if not PY2:
      from urllib.parse import quote as url_quote, unquote as url_unquote
      from urllib.parse import quote_plus, unquote_plus
  
  else:
      from urllib import quote as url_quote
      from urllib import unquote as url_unquote
      from urllib import quote_plus, unquote_plus
  
  if not PY2:
      from urllib.parse import urlparse
  else:
      from urlparse import urlparse
  
  if not PY2:
      imap = map
      ifilter = filter
  else:
      from itertools import imap
      from itertools import ifilter
  
  
  if not PY2:
      from io import BytesIO
  else:
      from cStringIO import StringIO as BytesIO
  
  if not PY2:
      import pickle
      import copyreg
  else:
      try:
          import cPickle as pickle
          import copy_reg as copyreg
      except ImportError:
          import pickle
  
  xrange = range if not PY2 else xrange
  
  if not PY2:
      text_type = str
      unichr = chr
      binary_type = bytes
  else:
      text_type = basestring
      unichr = unichr
      binary_type = str
  
subject: Use basestring to check for key validity in Python 2