diff --git a/src/client.py b/src/client.py
--- a/src/client.py
+++ b/src/client.py
@@ -2,6 +2,7 @@
 import collections
 import socket
 import sys
+import logging as log
 
 import config as conf
 from networkers import NetworkReader,NetworkWriter
@@ -57,7 +58,7 @@ def negotiate():
 
 
 def sendData(blocksToTransfer):
-	print(blocksToTransfer)
+	log.info(blocksToTransfer)
 	dataFile=open(filename,mode="rb")
 	i1=-1
 
@@ -68,7 +69,7 @@ def sendData(blocksToTransfer):
 				dataFile.seek(i2*HashTree.BLOCK_SIZE)
 			binData=dataFile.read(HashTree.BLOCK_SIZE)
 
-			print("block #{0}: {1}...{2}".format(i2,binData[:5],binData[-5:]))
+			log.info("block #{0}: {1}...{2}".format(i2,binData[:5],binData[-5:]))
 
 			outcoming.writeMsg(jsonData,binData)
 			i1=i2
@@ -76,7 +77,7 @@ def sendData(blocksToTransfer):
 	with Connection() as (incoming,outcoming):
 		outcoming.writeMsg({"command":"end"})
 
-	print("closing...")
+	log.info("closing session...")
 	dataFile.close()