Update release script to run under Python 3

release.py

@@ -11,12 +11,21 @@ import subprocess
 import shutil
 import os
 import sys
-import urllib2
 import getpass
 import collections
 import itertools
 import re
 
+try:
+	import urllib.request as urllib_request
+except ImportError:
+	import urllib2 as urllib_request
+
+try:
+	input = raw_input
+except NameError:
+	pass
+
 try:
 	import keyring
 except Exception:
@@ -27,7 +36,7 @@ PACKAGE_INDEX = 'https://pypi.python.org/pypi'
 
 def set_versions():
 	global VERSION
-	version = raw_input("Release as version [%s]> " % VERSION) or VERSION
+	version = input("Release as version [%s]> " % VERSION) or VERSION
 	if version != VERSION:
 		VERSION = bump_versions(version)
 
@@ -99,11 +108,11 @@ def add_milestone_and_version(version):
 	for type in 'milestones', 'versions':
 		url = (base + '/1.0/repositories/{repo}/issues/{type}'
 			.format(repo = get_repo_name(), type=type))
-		req = urllib2.Request(url = url, headers = headers,
+		req = urllib_request.Request(url = url, headers = headers,
 			data='name='+version)
 		try:
-			urllib2.urlopen(req)
-		except urllib2.HTTPError as e:
+			urllib_request.urlopen(req)
+		except urllib_request.HTTPError as e:
 			print(e.fp.read())
 
 def bump_versions(target_ver):
@@ -116,7 +125,10 @@ def bump_versions(target_ver):
 
 def bump_version(filename, target_ver):
 	with open(filename, 'rb') as f:
-		lines = [line.replace(VERSION, target_ver) for line in f]
+		lines = [
+			line.replace(VERSION.encode('ascii'), target_ver.encode('ascii'))
+			for line in f
+		]
 	with open(filename, 'wb') as f:
 		f.writelines(lines)