use an abstract class SequenceClass

lib/wallet.py

@@ -93,8 +93,9 @@ class Wallet:
         self.tx_height             = config.get('tx_height',{})
         self.accounts              = config.get('accounts', {})   # this should not include public keys
 
+        self.SequenceClass = ElectrumSequence
         self.sequences = {}
-        self.sequences[0] = ElectrumSequence(self.config.get('master_public_key'))
+        self.sequences[0] = self.SequenceClass(self.config.get('master_public_key'))
 
         if self.accounts.get(0) is None:
             self.accounts[0] = { 0:[], 1:[], 'name':'Main account' }
@@ -161,13 +162,13 @@ class Wallet:
         self.seed = seed 
         self.config.set_key('seed', self.seed, True)
         self.config.set_key('seed_version', self.seed_version, True)
-        mpk = ElectrumSequence.mpk_from_seed(self.seed)
+        mpk = self.SequenceClass.mpk_from_seed(self.seed)
         self.init_sequence(mpk)
 
 
     def init_sequence(self, mpk):
         self.config.set_key('master_public_key', mpk, True)
-        self.sequences[0] = ElectrumSequence(mpk)
+        self.sequences[0] = self.SequenceClass(mpk)
         self.accounts[0] = { 0:[], 1:[], 'name':'Main account' }
         self.config.set_key('accounts', self.accounts, True)