filter-repo (python3): shebang and imports

Signed-off-by: Elijah Newren <newren@gmail.com>

git-filter-repo

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 git-filter-repo filters git repositories, similar to git filter-branch, BFG
@@ -30,8 +30,6 @@ operations; however:
   ***** END API BACKWARD COMPATIBILITY CAVEAT *****
 """
 
-from __future__ import print_function
-
 import argparse
 import collections
 import fnmatch
@@ -39,7 +37,7 @@ import gettext
 import os
 import re
 import shutil
-import StringIO
+import io
 import subprocess
 import sys
 import time
@@ -408,7 +406,7 @@ class _GitElement(object):
     Convert GitElement to string; used for debugging
     """
     old_dumped = self.dumped
-    writeme = StringIO.StringIO()
+    writeme = io.StringIO()
     self.dump(writeme)
     output_lines = writeme.getvalue().splitlines()
     writeme.close()

t/t9391-filter-repo-lib-usage.sh

@@ -158,7 +158,7 @@ test_expect_success 'other error cases' '
 		mkdir other &&
 		cd other &&
 
-		! python -c "import git_filter_repo as fr; fr.GitUtils.get_commit_count(\".\", [\"HEAD\"])" 2>err &&
+		! python3 -c "import git_filter_repo as fr; fr.GitUtils.get_commit_count(\".\", [\"HEAD\"])" 2>err &&
 		test_i18ngrep ". does not appear to be a valid git repository" err
 	)
 '

t/t9391/commit_info.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/create_fast_export_output.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/erroneous.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/file_filter.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/print_progress.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the
@@ -21,8 +21,8 @@ commit_count = 0
 
 def print_progress():
   global object_count, commit_count, total_objects, total_commits
-  print "\rRewriting commits... %d/%d  (%d objects)" \
+  print("\rRewriting commits... %d/%d  (%d objects)"
-        % (commit_count, total_commits, object_count),
+        % (commit_count, total_commits, object_count), end='')
 
 def my_blob_callback(blob):
   global object_count

t/t9391/rename-master-to-develop.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/splice_repos.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/strip-cvs-keywords.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Please see the

t/t9391/unusual.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Please: DO NOT USE THIS AS AN EXAMPLE.
 #
@@ -14,7 +14,7 @@
 import collections
 import os
 import random
-import StringIO
+import io
 import sys
 import textwrap
 
@@ -71,7 +71,7 @@ print("Found {} blobs/commits and {} other objects"
       .format(total_objects['common'], total_objects['uncommon']))
 
 
-stream = StringIO.StringIO(textwrap.dedent('''
+stream = io.StringIO(textwrap.dedent('''
   blob
   mark :1
   data 5