diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e7498fa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+__pycache__
+*.bak
+*.ntfl
+*.topo.sh
+example/*.py
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ff0f1e8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,35 @@
+# Nanonet
+
+This repository implements the Nanonet tool, as described [here](https://segment-routing.org/index.php/Testing/Nanonet).
+
+As Python 2 is now deprecated, it was updated in September 2024 to support Python 3 runtime.
+
+## Running the example
+
+- Check the contents of the NTFL example file
+```
+nanonet $ cat example/example.ntfl 
+A B 1 0.2 100000
+A C 1 0.2 100000
+B C 1 0.2 100000
+```
+
+- Generate a topology out of this file:
+```
+nanonet $ ./tools/ntfl2topo.sh example/example.ntfl Test > example/example.py
+```
+
+- Create a deployment script out of the topology:
+```
+nanonet $ ./build example/example.py Test
+# Building topology...
+# Assigning prefixes...
+# Running dijkstra... (3 nodes)
+# Running dijkstra for node B (1/3)
+# Running dijkstra for node C (2/3)
+# Running dijkstra for node A (3/3)
+nanonet $
+```
+
+You obtain a file named Test.topo.sh that contains all the commands to execute to deploy the topology on linux.
+
diff --git a/addr.py b/addr.py
index 1f4f5c6..de08c26 100644
--- a/addr.py
+++ b/addr.py
@@ -16,7 +16,7 @@ def __init__(self, net, mask, submask):
 		self.idx_low = self.submask/8 - 1
 
 	def next_net(self):
-		i = self.idx_low
+		i = int(self.idx_low)
 
 		while i >= self.idx_high:
 			if self.curnet[i] == 0xff:
diff --git a/build b/build
index a9f1831..f926728 100755
--- a/build
+++ b/build
@@ -8,7 +8,7 @@ from net import *
 # custom exec inspired by mininet
 
 def usage():
-	print 'Usage: %s topofile.py toponame [outdir]' % (sys.argv[0])
+	print('Usage: %s topofile.py toponame [outdir]' % (sys.argv[0]))
 	sys.exit(-1)
 
 if len(sys.argv) < 3 or len(sys.argv) > 4:
@@ -23,8 +23,8 @@ topos = {}
 sys.path.append('.')
 
 customs = {}
-execfile(sys.argv[1], customs, customs)
-for name, val in customs.iteritems():
+exec(compile(open(sys.argv[1], "rb").read(), sys.argv[1], 'exec'), customs, customs)
+for name, val in customs.items():
 	if name == 'topos':
 		globals()['topos'].update(val)
 	else:
diff --git a/example/.gitkeep b/example/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/example/example.ntfl b/example/example.ntfl
new file mode 100644
index 0000000..e84fe9d
--- /dev/null
+++ b/example/example.ntfl
@@ -0,0 +1,3 @@
+A B 1 0.2 100000
+A C 1 0.2 100000
+B C 1 0.2 100000
diff --git a/net.py b/net.py
index 0a5b905..6e30962 100644
--- a/net.py
+++ b/net.py
@@ -40,22 +40,22 @@ def assign(self):
 #			print e.port2
 #			print 'For port1 %d and port2 %d' % (e.port1, e.port2)
 
-			e.node1.intfs_addr[e.port1] = socket.inet_ntop(socket.AF_INET6, str(a1))+'/'+str(self.linknet.submask)
-			e.node2.intfs_addr[e.port2] = socket.inet_ntop(socket.AF_INET6, str(a2))+'/'+str(self.linknet.submask)
+			e.node1.intfs_addr[e.port1] = socket.inet_ntop(socket.AF_INET6, a1)+'/'+str(self.linknet.submask)
+			e.node2.intfs_addr[e.port2] = socket.inet_ntop(socket.AF_INET6, a2)+'/'+str(self.linknet.submask)
 
 		for n in self.topo.nodes:
 			enet = self.loopnet.next_net()
 			enet[-1] = 1
 
-			n.addr = socket.inet_ntop(socket.AF_INET6, str(enet))+'/'+str(self.loopnet.submask)
+			n.addr = socket.inet_ntop(socket.AF_INET6, enet)+'/'+str(self.loopnet.submask)
 
 	def start(self, netname=None):
-		print '# Building topology...'
+		print('# Building topology...')
 		self.topo.build()
-		print '# Assigning prefixes...'
+		print('# Assigning prefixes...')
 		self.assign()
 
-		print '# Running dijkstra... (%d nodes)' % len(self.topo.nodes)
+		print('# Running dijkstra... (%d nodes)' % len(self.topo.nodes))
 		self.topo.compute()
 
 		if netname is not None:
@@ -105,7 +105,7 @@ def dump_commands(self, wr=(lambda x: self.call(x)), noroute=False):
 
 		if not noroute:
 			for n in self.topo.nodes:
-				for dst in n.routes.keys():
+				for dst in list(n.routes.keys()):
 					rts = n.routes[dst]
 					laddr = n.addr.split('/')[0]
 					if len(rts) == 1:
@@ -120,7 +120,7 @@ def dump_commands(self, wr=(lambda x: self.call(x)), noroute=False):
 		for c in host_cmd:
 			wr('%s' % c)
 
-		for n in node_cmd.keys():
+		for n in list(node_cmd.keys()):
 			wr('ip netns exec %s bash -c \'%s\'' % (n.name, "; ".join(node_cmd[n])))
 
 	def igp_prepare_link_down(self, name1, name2):
diff --git a/node.py b/node.py
index 84f0f7e..02f21a5 100644
--- a/node.py
+++ b/node.py
@@ -19,7 +19,7 @@ def __init__(self, name):
 		self.routes = {}
 
 	def add_route(self, r):
-		if r.dst not in self.routes.keys():
+		if r.dst not in list(self.routes.keys()):
 			self.routes[r.dst] = [r]
 		else:
 			self.routes[r.dst].append(r)
@@ -255,7 +255,7 @@ def get_nh_from_paths(self, paths):
 	def compute_node(self, n):
 		n.routes = {}
 		dist, path = self.dijkstra(n)
-		for t in dist.keys():
+		for t in list(dist.keys()):
 			if len(path[t]) == 0:
 				continue
 			nh = self.get_nh_from_paths(path[t])
@@ -268,6 +268,6 @@ def compute_node(self, n):
 	def compute(self):
 		cnt = 0
 		for n in self.nodes:
-			print '# Running dijkstra for node %s (%d/%d)' % (n.name, cnt+1, len(self.nodes))
+			print('# Running dijkstra for node %s (%d/%d)' % (n.name, cnt+1, len(self.nodes)))
 			self.compute_node(n)
 			cnt += 1