diff --git a/tools/releasetools/validate_target_files.py b/tools/releasetools/validate_target_files.py
index 4b34820c8..b5903920a 100755
--- a/tools/releasetools/validate_target_files.py
+++ b/tools/releasetools/validate_target_files.py
@@ -23,13 +23,14 @@ It performs checks to ensure the integrity of the input zip.
    same check also applies to the vendor image if present.
 """
 
-import common
 import logging
 import os.path
 import re
-import sparse_img
 import sys
 
+import common
+import sparse_img
+
 
 def _GetImage(which, tmpdir):
   assert which in ('system', 'vendor')
@@ -64,13 +65,13 @@ def _ReadFile(file_name, unpacked_name, round_up=False):
 def ValidateFileAgainstSha1(input_tmp, file_name, file_path, expected_sha1):
   """Check if the file has the expected SHA-1."""
 
-  logging.info('Validating the SHA-1 of {}'.format(file_name))
+  logging.info('Validating the SHA-1 of %s', file_name)
   unpacked_name = os.path.join(input_tmp, file_path)
   assert os.path.exists(unpacked_name)
   actual_sha1 = _ReadFile(file_name, unpacked_name, False).sha1
   assert actual_sha1 == expected_sha1, \
       'SHA-1 mismatches for {}. actual {}, expected {}'.format(
-      file_name, actual_sha1, expected_sha1)
+          file_name, actual_sha1, expected_sha1)
 
 
 def ValidateFileConsistency(input_zip, input_tmp):
@@ -147,10 +148,10 @@ def ValidateInstallRecoveryScript(input_tmp, info_dict):
 
   script_path = 'SYSTEM/bin/install-recovery.sh'
   if not os.path.exists(os.path.join(input_tmp, script_path)):
-    logging.info('{} does not exist in input_tmp'.format(script_path))
+    logging.info('%s does not exist in input_tmp', script_path)
     return
 
-  logging.info('Checking {}'.format(script_path))
+  logging.info('Checking %s', script_path)
   with open(os.path.join(input_tmp, script_path), 'r') as script:
     lines = script.read().strip().split('\n')
   assert len(lines) >= 6
@@ -168,7 +169,7 @@ def ValidateInstallRecoveryScript(input_tmp, info_dict):
     expected_recovery_sha1 = applypatch_argv[3].strip()
     assert expected_recovery_check_sha1 == expected_recovery_sha1
     ValidateFileAgainstSha1(input_tmp, 'recovery.img',
-        'SYSTEM/etc/recovery.img', expected_recovery_sha1)
+                            'SYSTEM/etc/recovery.img', expected_recovery_sha1)
   else:
     # We're patching boot.img to get recovery.img where bonus_args is optional
     if applypatch_argv[1] == "-b":
@@ -182,16 +183,17 @@ def ValidateInstallRecoveryScript(input_tmp, info_dict):
     boot_info = applypatch_argv[boot_info_index].strip().split(':')
     assert len(boot_info) == 4
     ValidateFileAgainstSha1(input_tmp, file_name='boot.img',
-        file_path='IMAGES/boot.img', expected_sha1=boot_info[3])
+                            file_path='IMAGES/boot.img',
+                            expected_sha1=boot_info[3])
 
     recovery_sha1_index = boot_info_index + 2
     expected_recovery_sha1 = applypatch_argv[recovery_sha1_index]
     assert expected_recovery_check_sha1 == expected_recovery_sha1
     ValidateFileAgainstSha1(input_tmp, file_name='recovery.img',
-        file_path='IMAGES/recovery.img',
-        expected_sha1=expected_recovery_sha1)
+                            file_path='IMAGES/recovery.img',
+                            expected_sha1=expected_recovery_sha1)
 
-  logging.info('Done checking {}'.format(script_path))
+  logging.info('Done checking %s', script_path)
 
 
 def main(argv):