old_contents: import sys
  from pyasn1.compat.octets import octs2ints
  from pyasn1 import error
  from pyasn1 import __version__
  
  flagNone     = 0x0000
  flagEncoder  = 0x0001
  flagDecoder  = 0x0002
  flagAll      = 0xffff
  
  flagMap = {
      'encoder': flagEncoder,
      'decoder': flagDecoder,
      'all': flagAll
      }
  
  class Debug:
      defaultPrinter = sys.stderr.write
      def __init__(self, *flags):
          self._flags = flagNone
          if not self.defaultPrinter:
              raise error.PyAsn1Error('Null debug writer specified')
          self._printer = self.defaultPrinter
          self('running pyasn1 version %s' % __version__)
          for f in flags:
              if f not in flagMap:
                  raise error.PyAsn1Error('bad debug flag %s' % (f,))
              self._flags = self._flags | flagMap[f]
              self('debug category \'%s\' enabled' % f)
          
      def __str__(self):
          return 'logger %s, flags %x' % (self._printer, self._flags)
      
      def __call__(self, msg):
          self._printer('DBG: %s\n' % msg)
  
      def __and__(self, flag):
          return self._flags & flag
  
      def __rand__(self, flag):
          return flag & self._flags
  
  logger = 0
  
  def setLogger(l):
      global logger
      logger = l
  
  def hexdump(octets):
      return ' '.join(
              [ '%s%.2X' % (n%16 == 0 and ('\n%.5d: ' % n) or '', x) 
                for n,x in zip(range(len(octets)), octs2ints(octets)) ]
          )
  
  class Scope:
      def __init__(self):
          self._list = []
  
      def __str__(self): return '.'.join(self._list)
  
      def push(self, token):
          self._list.append(token)
  
      def pop(self):
          return self._list.pop()
  
  scope = Scope()
  
new_contents: import sys
  from pyasn1.compat.octets import octs2ints
  from pyasn1 import error
  from pyasn1 import __version__
  
  flagNone     = 0x0000
  flagEncoder  = 0x0001
  flagDecoder  = 0x0002
  flagAll      = 0xffff
  
  flagMap = {
      'encoder': flagEncoder,
      'decoder': flagDecoder,
      'all': flagAll
      }
  
  class Debug:
      defaultPrinter = sys.stderr and sys.stderr.write or None
      def __init__(self, *flags):
          self._flags = flagNone
          if not self.defaultPrinter:
              raise error.PyAsn1Error('Null debug writer specified')
          self._printer = self.defaultPrinter
          self('running pyasn1 version %s' % __version__)
          for f in flags:
              if f not in flagMap:
                  raise error.PyAsn1Error('bad debug flag %s' % (f,))
              self._flags = self._flags | flagMap[f]
              self('debug category \'%s\' enabled' % f)
          
      def __str__(self):
          return 'logger %s, flags %x' % (self._printer, self._flags)
      
      def __call__(self, msg):
          self._printer('DBG: %s\n' % msg)
  
      def __and__(self, flag):
          return self._flags & flag
  
      def __rand__(self, flag):
          return flag & self._flags
  
  logger = 0
  
  def setLogger(l):
      global logger
      logger = l
  
  def hexdump(octets):
      return ' '.join(
              [ '%s%.2X' % (n%16 == 0 and ('\n%.5d: ' % n) or '', x) 
                for n,x in zip(range(len(octets)), octs2ints(octets)) ]
          )
  
  class Scope:
      def __init__(self):
          self._list = []
  
      def __str__(self): return '.'.join(self._list)
  
      def push(self, token):
          self._list.append(token)
  
      def pop(self):
          return self._list.pop()
  
  scope = Scope()
  
subject: handle the case of deactivated sys.stderr