old_contents: # encoding: utf-8
  """
  esi.py
  
  Created by Thomas Mangin on 2012-07-08.
  Copyright (c) 2014-2015 Orange. All rights reserved.
  Copyright (c) 2014-2015 Exa Networks. All rights reserved.
  """
  
  # TODO: take into account E-VPN specs that specify the role of the first bit of ESI
  # (since draft-ietf-l2vpn-evpn-05)
  
  
  # Ethernet Segment Identifier
  class ESI (object):
  	DEFAULT = ''.join(chr(0) for _ in range(0,10))
  	MAX = ''.join(chr(0xFF) for _ in range(0,10))
  
  	__slots__ = ['esi']
  
  	def __init__ (self, esi=None):
  		self.esi = self.DEFAULT if esi is None else esi
  
  	def __eq__ (self, other):
  		return self.esi == other.esi
  
  	def __neq__ (self, other):
  		return self.esi != other.esi
  
  	def __lt__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __le__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __gt__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __ge__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __str__ (self):
  		if self.esi == self.DEFAULT:
  			return "-"
  		return ":".join('%02x' % ord(_) for _ in self.esi)
  
  	def __repr__ (self):
  		return self.__str__()
  
  	def pack (self):
  		return self.esi
  
  	def __len__ (self):
  		return 10
  
  	def __hash__ (self):
  		return hash(self.esi)
  
  	@classmethod
  	def unpack (cls, data):
  		return cls(data[:10])
  
new_contents: # encoding: utf-8
  """
  esi.py
  
  Created by Thomas Mangin on 2012-07-08.
  Copyright (c) 2014-2015 Orange. All rights reserved.
  Copyright (c) 2014-2015 Exa Networks. All rights reserved.
  """
  
  # TODO: take into account E-VPN specs that specify the role of the first bit of ESI
  # (since draft-ietf-l2vpn-evpn-05)
  
  
  # Ethernet Segment Identifier
  class ESI (object):
  	DEFAULT = ''.join(chr(0) for _ in range(0,10))
  	MAX = ''.join(chr(0xFF) for _ in range(0,10))
  
  	__slots__ = ['esi']
  
  	def __init__ (self, esi=None):
  		self.esi = self.DEFAULT if esi is None else esi
  		if len(self.esi)!=10:
  			raise Exception("incorrect ESI, len %d instead of 10" % len(esi))
  
  	def __eq__ (self, other):
  		return self.esi == other.esi
  
  	def __neq__ (self, other):
  		return self.esi != other.esi
  
  	def __lt__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __le__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __gt__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __ge__ (self, other):
  		raise RuntimeError('comparing ESI for ordering does not make sense')
  
  	def __str__ (self):
  		if self.esi == self.DEFAULT:
  			return "-"
  		return ":".join('%02x' % ord(_) for _ in self.esi)
  
  	def __repr__ (self):
  		return self.__str__()
  
  	def pack (self):
  		return self.esi
  
  	def __len__ (self):
  		return 10
  
  	def __hash__ (self):
  		return hash(self.esi)
  
  	@classmethod
  	def unpack (cls, data):
  		return cls(data[:10])
  
subject: Test init value for ESI