tigertool: Migrate tigertool.py to python2/3 compatible

BUG=chromium:1031705
BRANCH=master
TEST=None

Signed-off-by: kerker <[email protected]>
Change-Id: I50b9aa6724bc6d9db5c7f743909d81c0b2dfc849
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2431319
Reviewed-by: Daisuke Nojiri <[email protected]>
Reviewed-by: Jack Rosenthal <[email protected]>

Author: flere114

extra/tigertool/tigertool.py

@@ -1,10 +1,12 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright 2017 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Script to control tigertail USB-C Mux board."""
 
+# Note: This is a py2/3 compatible file.
+
 import argparse
 import sys
 import time
@@ -125,7 +127,7 @@ def do_power(count, bus, pty):
           'Power        : \S+ \S+ (\d+) mW\s+' \
           'Current      : \S+ \S+ (\d+) mA'
 
-  for i in xrange(0, count):
+  for i in range(0, count):
     results = pty._issue_cmd_get_results(cmd, [regex])[0]
     c.log('%.2f,\t%s,\t%s\t%s' % (time.time() - start,
           results[1], results[2], results[3]))