diff --git a/monitoringplugin.py b/monitoringplugin.py
index 3e821ac..75fbc41 100644
--- a/monitoringplugin.py
+++ b/monitoringplugin.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- encoding: utf-8 -*-
 
 #####################################################################
@@ -302,7 +302,7 @@ class MonitoringPlugin(object):
 
 
 	def seconds_to_timedelta(self, seconds):
-		return datetime.timedelta(seconds=long(seconds))
+		return datetime.timedelta(seconds=int(seconds))
 
 
 	def human_to_number(self, value, total=None, unit=['',]):
@@ -365,12 +365,12 @@ class MonitoringPlugin(object):
 			bol = 'V' + str(level) + ':' + ' ' * level
 			if prefix:
 				bol += '%s' % prefix
-			if type(output) in [str, unicode, ]:
-				print(bol + output)
+			if type(output) in [str, str, ]:
+				print((bol + output))
 			elif type(output) in [list, ]:
-				print('\n'.join( ['%s%s' % (bol, l) for l in output] ) )
+				print(('\n'.join( ['%s%s' % (bol, l) for l in output] ) ))
 			else:
-				print('%s%s' % (bol, output) )
+				print(('%s%s' % (bol, output) ))
 
 
 	def max_returncode(self, returncodes):
@@ -423,7 +423,7 @@ class MonitoringPlugin(object):
 
 		# Exit program or return output line(s)
 		if exit:
-			print out
+			print(out)
 			sys.exit(returncode)
 		else:
 			return (returncode, out)
@@ -556,18 +556,18 @@ class SNMPMonitoringPlugin(MonitoringPlugin):
 				idx = ''
 
 			if self.options.snmpversion in [1, '1']:
-				value_low = long(self.SNMPGET_wrapper(baseoid[1] +  idx, exitonerror=exitonerror))
-				if value_low < 0L:
+				value_low = int(self.SNMPGET_wrapper(baseoid[1] +  idx, exitonerror=exitonerror))
+				if value_low < 0:
 					value_low += 2 ** 32
 
-				value_hi = long(self.SNMPGET_wrapper(baseoid[2] + idx, exitonerror=exitonerror))
-				if value_hi < 0L:
+				value_hi = int(self.SNMPGET_wrapper(baseoid[2] + idx, exitonerror=exitonerror))
+				if value_hi < 0:
 					value_hi += 2 ** 32
 
-				return value_hi * 2L ** 32L + value_low
+				return value_hi * 2 ** 32 + value_low
 
 			elif self.options.snmpversion in [2, 3, '2', '2c', '3']:
-				return long(self.SNMPGET_wrapper(baseoid[0] + idx, exitonerror=exitonerror))
+				return int(self.SNMPGET_wrapper(baseoid[0] + idx, exitonerror=exitonerror))
 
 		elif type(baseoid) in (str, ) and idx != None:
 			return self.SNMPGET_wrapper(baseoid + '.' + str(idx), exitonerror=exitonerror)
@@ -703,14 +703,14 @@ def main():
 	pprint(myplugin.back2nagios(3, 'Nr. 13: Exit Code UNKNOWN', exit=False) )
 
 	ret = myplugin.back2nagios(0, 'Nr. 20: Plugin with string-based multiline output', 'Line 2\nLine 3\nLine4', exit=False)
-	print ret[1]
-	print 'Returncode: ' + str(ret[0])
+	print(ret[1])
+	print('Returncode: ' + str(ret[0]))
 	ret = myplugin.back2nagios(0, 'Nr. 21: Plugin with list-based multiline output', ['Line 2', 'Line 3', 'Line4'], exit=False)
-	print ret[1]
-	print 'Returncode: ' + str(ret[0])
+	print(ret[1])
+	print('Returncode: ' + str(ret[0]))
 	ret = myplugin.back2nagios(0, 'Nr. 22: Plugin with tuple-based multiline output', ('Line 2', 'Line 3', 'Line4'), exit=False)
-	print ret[1]
-	print 'Returncode: ' + str(ret[0])
+	print(ret[1])
+	print('Returncode: ' + str(ret[0]))
 
 	myplugin.add_performancedata('Val1', 42, '')
 	myplugin.add_performancedata('Val2', 23, 'c', warn=10, crit=20, min=0, max=100)