diff --git a/cluster-autoscaler/update_toc.py b/cluster-autoscaler/update_toc.py
index 4af4664f2398675f520daa2f5d67727cb9f912f4..34a7d2639b5167bdf2549a4c5653a5ad5f2d35fd 100755
--- a/cluster-autoscaler/update_toc.py
+++ b/cluster-autoscaler/update_toc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 The Kubernetes Authors.
 #
diff --git a/hack/boilerplate/boilerplate.py b/hack/boilerplate/boilerplate.py
index f12dfeeffd4b6a292bf174685b40a8a13783d73c..9c374c4c046971e1fa5259f4c8b79e6c738d80bf 100755
--- a/hack/boilerplate/boilerplate.py
+++ b/hack/boilerplate/boilerplate.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2015 The Kubernetes Authors.
 #
diff --git a/hack/boilerplate/boilerplate.py.txt b/hack/boilerplate/boilerplate.py.txt
index a2e72e5988e73d67bc84e088133ffa0b041998cd..9fdb989ce7c5b32e3880a8dd78a17dfdfe2e8185 100644
--- a/hack/boilerplate/boilerplate.py.txt
+++ b/hack/boilerplate/boilerplate.py.txt
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright YEAR The Kubernetes Authors.
 #
diff --git a/hack/scripts/break_mig.py b/hack/scripts/break_mig.py
index 53858892d590d7b7ee8d89d946ca69d7c56a421d..f487ce2c591170e09b9deb709a1665eee041d30d 100755
--- a/hack/scripts/break_mig.py
+++ b/hack/scripts/break_mig.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 The Kubernetes Authors.
 #
@@ -41,11 +41,6 @@ import subprocess
 import sys
 import time
 
-try:
-  range = xrange   # Python 2
-except NameError:  # Python 3
-  pass
-
 
 InstanceInfo = collections.namedtuple("InstanceInfo", 'name ip')
 
diff --git a/hack/scripts/ca_metrics_parser.py b/hack/scripts/ca_metrics_parser.py
index 155bdbef6fb04f225c0c24f97bda722b042a35ac..51083c0d74ec7638ecd38e91b9ba913b18b78fdc 100755
--- a/hack/scripts/ca_metrics_parser.py
+++ b/hack/scripts/ca_metrics_parser.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 The Kubernetes Authors.
 #
@@ -22,11 +22,6 @@ from __future__ import print_function
 import argparse
 import json
 
-try:
-  range = xrange   # Python 2
-except NameError:  # Python 3
-  pass
-
 
 class CAMetric(object):