diff --git a/networktrainer.py b/networktrainer.py
index ddd6b01..3bb0d31 100644
--- a/networktrainer.py
+++ b/networktrainer.py
@@ -3,21 +3,13 @@
 import json
 
 def chaine(str):
-	L=[]
-	i=0
-	for c in str:
-		L.insert(i,ord(c)/256)
-		i=i+1
-		if i==255 :
-			break
-	for a in range(0,256-len(L)):
-		L.insert(i,0)
-	return L
+    L = [ord(c)/256 for c in str[:256]]
+    for i in range(len(L), 256):
+        L.append(0)
+    return L
 
 def construireReseau():
-	L=[]
-	for i in range(0,256):
-		L.insert(-1,[0,1])
+	L = [(0, 1)] * 256
 	net = nl.net.newff(L,[5,1])
 	return net
 
@@ -25,17 +17,17 @@ def lireDataset():
 	f=open("testpymath")
 	inp=[]
 	tar=[]
-	line=f.readline()
-	line=line.rstrip("\n")
-	while line!="":
-		inp.insert(-1,chaine(line))
+        while True:
 		line=f.readline()
 		line=line.rstrip("\n")
-		tar.insert(-1,[2*((int)(line))-1])
+                if not line:
+                    break
+		inp.append(chaine(line))
 		line=f.readline()
 		line=line.rstrip("\n")
+		tar.append([2*int(line)-1])
 	f.close()
-	return [inp,tar]
+	return [reversed(inp),reversed(tar)]
 
 def construireDataset():
 	json_data=open('Documents/logger.frontend.askplatyp.us.json')