diff --git a/src/client.py b/src/client.py
--- a/src/client.py
+++ b/src/client.py
@@ -12,10 +12,10 @@ from networkers import NetworkReader,Net
 
 class Connection:
 	def __init__(self):
-		self.socket=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
-		self.socket.connect((conf.hosts[0], conf.port))
-		fr=self.socket.makefile(mode="rb")
-		fw=self.socket.makefile(mode="wb")
+		self._socket=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+		self._socket.connect((conf.hosts[0], conf.port))
+		fr=self._socket.makefile(mode="rb")
+		fw=self._socket.makefile(mode="wb")
 
 		self.incoming=NetworkReader(fr)
 		self.outcoming=NetworkWriter(fw)
@@ -24,16 +24,16 @@ class Connection:
 		return self.incoming,self.outcoming
 
 	def __exit__(self, exc_type, exc_val, exc_tb):
-		self.socket.close()
+		self._socket.close()
 
 
 class Client:
 	def __init__(self,filename):
-		self.filename=filename
+		self._filename=filename
 
 	def negotiate(self):
 		print(datetime.now(), "initializing...")
-		localTree=HashTree.fromFile(self.filename)
+		localTree=HashTree.fromFile(self._filename)
 		blocksToTransfer=[]
 		nodeStack=collections.deque([0]) # root
 
@@ -69,7 +69,7 @@ class Client:
 
 	def sendData(self,blocksToTransfer):
 		log.info(blocksToTransfer)
-		dataFile=open(self.filename,mode="rb")
+		dataFile=open(self._filename, mode="rb")
 		i1=-1
 
 		print(datetime.now(), "sending data:")