diff --git a/Tools/scripts/abitype.py b/Tools/scripts/abitype.py
old mode 100644
new mode 100755
--- a/Tools/scripts/abitype.py
+++ b/Tools/scripts/abitype.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # This script converts a C file to use the PEP 384 type definition API
 # Usage: abitype.py < old_code > new_code
 import re, sys
diff --git a/Tools/scripts/cleanfuture.py b/Tools/scripts/cleanfuture.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/combinerefs.py b/Tools/scripts/combinerefs.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/db2pickle.py b/Tools/scripts/db2pickle.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/diff.py b/Tools/scripts/diff.py
old mode 100644
new mode 100755
--- a/Tools/scripts/diff.py
+++ b/Tools/scripts/diff.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """ Command line interface to difflib.py providing diffs in four formats:
 
 * ndiff:    lists every line and highlights interline changes.
diff --git a/Tools/scripts/find_recursionlimit.py b/Tools/scripts/find_recursionlimit.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/get-remote-certificate.py b/Tools/scripts/get-remote-certificate.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/mailerdaemon.py b/Tools/scripts/mailerdaemon.py
old mode 100644
new mode 100755
--- a/Tools/scripts/mailerdaemon.py
+++ b/Tools/scripts/mailerdaemon.py
@@ -1,4 +1,5 @@
-"""mailerdaemon - classes to parse mailer-daemon messages"""
+#!/usr/bin/env python3
+"""classes to parse mailer-daemon messages"""
 
 import calendar
 import email.message
@@ -6,7 +7,10 @@ import re
 import os
 import sys
 
-Unparseable = 'mailerdaemon.Unparseable'
+
+class Unparseable(Exception):
+    pass
+
 
 class ErrorMessage(email.message.Message):
     def __init__(self):
@@ -18,8 +22,10 @@ class ErrorMessage(email.message.Message
         if not sub:
             return 0
         sub = sub.lower()
-        if sub.startswith('waiting mail'): return 1
-        if 'warning' in sub: return 1
+        if sub.startswith('waiting mail'):
+            return 1
+        if 'warning' in sub:
+            return 1
         self.sub = sub
         return 0
 
@@ -145,13 +151,15 @@ def emparse_list(fp, sub):
         errors.append(' '.join((email.strip()+': '+reason).split()))
     return errors
 
-EMPARSERS = [emparse_list, ]
+EMPARSERS = [emparse_list]
 
 def sort_numeric(a, b):
     a = int(a)
     b = int(b)
-    if a < b: return -1
-    elif a > b: return 1
+    if a < b:
+        return -1
+    elif a > b:
+        return 1
     else: return 0
 
 def parsedir(dir, modify):
diff --git a/Tools/scripts/make_ctype.py b/Tools/scripts/make_ctype.py
old mode 100644
new mode 100755
--- a/Tools/scripts/make_ctype.py
+++ b/Tools/scripts/make_ctype.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """Script that generates the ctype.h-replacement in stringobject.c."""
 
 NAMES = ("LOWER", "UPPER", "ALPHA", "DIGIT", "XDIGIT", "ALNUM", "SPACE")
diff --git a/Tools/scripts/md5sum.py b/Tools/scripts/md5sum.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/patchcheck.py b/Tools/scripts/patchcheck.py
old mode 100644
new mode 100755
--- a/Tools/scripts/patchcheck.py
+++ b/Tools/scripts/patchcheck.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import re
 import sys
 import shutil
diff --git a/Tools/scripts/pickle2db.py b/Tools/scripts/pickle2db.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/pysource.py b/Tools/scripts/pysource.py
old mode 100644
new mode 100755
diff --git a/Tools/scripts/reindent-rst.py b/Tools/scripts/reindent-rst.py
--- a/Tools/scripts/reindent-rst.py
+++ b/Tools/scripts/reindent-rst.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Make a reST file compliant to our pre-commit hook.
 # Currently just remove trailing whitespace.
diff --git a/Tools/scripts/svneol.py b/Tools/scripts/svneol.py
old mode 100644
new mode 100755