diff --git a/gluon/authapi.py b/gluon/authapi.py
index 4bc7727f..3347cb68 100644
--- a/gluon/authapi.py
+++ b/gluon/authapi.py
@@ -115,7 +115,7 @@ class AuthAPI(object):
             if auth.last_visit and auth.last_visit + delta > now:
                 self.user = auth.user
                 # this is a trick to speed up sessions to avoid many writes
-                if (now - auth.last_visit).seconds > (auth.expiration / 10):
+                if (now - auth.last_visit).seconds > (auth.expiration // 10):
                     auth.last_visit = now
             else:
                 self.user = None
diff --git a/gluon/contrib/imageutils.py b/gluon/contrib/imageutils.py
index 28cf10e0..a5c24b69 100644
--- a/gluon/contrib/imageutils.py
+++ b/gluon/contrib/imageutils.py
@@ -45,7 +45,7 @@ class RESIZE(object):
                 background = Image.new('RGBA', (self.nx, self.ny), (255, 255, 255, 0))
                 background.paste(
                     img,
-                    ((self.nx - img.size[0]) / 2, (self.ny - img.size[1]) / 2))
+                    ((self.nx - img.size[0]) // 2, (self.ny - img.size[1]) // 2))
                 background.save(s, 'JPEG', quality=self.quality)
             else:
                 img.save(s, 'JPEG', quality=self.quality)
diff --git a/gluon/fileutils.py b/gluon/fileutils.py
index 27fe8a8d..0fa29acf 100644
--- a/gluon/fileutils.py
+++ b/gluon/fileutils.py
@@ -415,10 +415,10 @@ def fix_newlines(path):
 |\r|
 )''')
     for filename in listdir(path, '.*\.(py|html)$', drop=False):
-        rdata = read_file(filename, 'rb')
+        rdata = read_file(filename, 'r')
         wdata = regex.sub('\n', rdata)
         if wdata != rdata:
-            write_file(filename, wdata, 'wb')
+            write_file(filename, wdata, 'w')
 
 
 def copystream(
diff --git a/gluon/http.py b/gluon/http.py
index ac630cc6..539a00fd 100644
--- a/gluon/http.py
+++ b/gluon/http.py
@@ -11,7 +11,7 @@ HTTP statuses helpers
 """
 
 import re
-from gluon._compat import iteritems
+from gluon._compat import iteritems, unicodeT
 
 __all__ = ['HTTP', 'redirect']
 
@@ -122,6 +122,8 @@ class HTTP(Exception):
         if env.get('request_method', '') == 'HEAD':
             return ['']
         elif isinstance(body, (str, bytes, bytearray)):
+            if isinstance(body, unicodeT):
+                body = body.encode('utf-8')
             return [body]
         elif hasattr(body, '__iter__'):
             return body
diff --git a/gluon/sqlhtml.py b/gluon/sqlhtml.py
index 59ebbeea..0468c0f7 100644
--- a/gluon/sqlhtml.py
+++ b/gluon/sqlhtml.py
@@ -405,7 +405,7 @@ class RadioWidget(OptionsWidget):
         cols = attributes.get('cols', 1)
         totals = len(options)
         mods = totals % cols
-        rows = totals / cols
+        rows = totals // cols
         if mods:
             rows += 1
 
@@ -471,7 +471,7 @@ class CheckboxesWidget(OptionsWidget):
         cols = attributes.get('cols', 1)
         totals = len(options)
         mods = totals % cols
-        rows = totals / cols
+        rows = totals // cols
         if mods:
             rows += 1
 
@@ -684,9 +684,10 @@ class AutocompleteWidget(object):
             urlvars = request.vars
             urlvars[default_var] = 1
             self.url = URL(args=request.args, vars=urlvars)
-            self.callback()
+            self.run_callback = True
         else:
             self.url = request
+            self.run_callback = False
 
     def callback(self):
         if self.keyword in self.request.vars:
@@ -759,6 +760,8 @@ class AutocompleteWidget(object):
                 raise HTTP(200, '')
 
     def __call__(self, field, value, **attributes):
+        if self.run_callback:
+            self.callback()
         default = dict(
             _type='text',
             value=(value is not None and str(value)) or '',
@@ -1916,7 +1919,7 @@ class SQLFORM(FORM):
         if 'table_name' in attributes:
             del attributes['table_name']
 
-        return SQLFORM(DAL(None).define_table(table_name, *fields),
+        return SQLFORM(DAL(None).define_table(table_name, *[field.clone() for field in fields]),
                        **attributes)
 
     @staticmethod
diff --git a/gluon/tests/test_fileutils.py b/gluon/tests/test_fileutils.py
index 5e408796..a4a25ee0 100644
--- a/gluon/tests/test_fileutils.py
+++ b/gluon/tests/test_fileutils.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+import os
 import unittest
 import datetime
 
-from gluon.fileutils import parse_version
+from gluon.fileutils import parse_version, fix_newlines
 
 
 class TestFileUtils(unittest.TestCase):
@@ -22,3 +23,6 @@ class TestFileUtils(unittest.TestCase):
         # Semantic Beta
         rtn = parse_version('Version 2.14.1-beta+timestamp.2016.03.21.22.35.26')
         self.assertEqual(rtn, (2, 14, 1, 'beta', datetime.datetime(2016, 3, 21, 22, 35, 26)))
+    
+    def test_fix_newlines(self):
+        fix_newlines(os.path.dirname(os.path.abspath(__file__)))
diff --git a/gluon/tools.py b/gluon/tools.py
index 0ff96de6..1f54e746 100644
--- a/gluon/tools.py
+++ b/gluon/tools.py
@@ -1762,7 +1762,7 @@ class Auth(AuthAPI):
             if auth.last_visit and auth.last_visit + delta > now:
                 self.user = auth.user
                 # this is a trick to speed up sessions to avoid many writes
-                if (now - auth.last_visit).seconds > (auth.expiration / 10):
+                if (now - auth.last_visit).seconds > (auth.expiration // 10):
                     auth.last_visit = now
             else:
                 self.user = None
@@ -5531,15 +5531,15 @@ def prettydate(d, T=lambda x: x, utc=False):
     else:
         suffix = ' ago'
     if dt.days >= 2 * 365:
-        return T('%d years' + suffix) % int(dt.days / 365)
+        return T('%d years' + suffix) % int(dt.days // 365)
     elif dt.days >= 365:
         return T('1 year' + suffix)
     elif dt.days >= 60:
-        return T('%d months' + suffix) % int(dt.days / 30)
+        return T('%d months' + suffix) % int(dt.days // 30)
     elif dt.days >= 27:  # 4 weeks ugly
         return T('1 month' + suffix)
     elif dt.days >= 14:
-        return T('%d weeks' + suffix) % int(dt.days / 7)
+        return T('%d weeks' + suffix) % int(dt.days // 7)
     elif dt.days >= 7:
         return T('1 week' + suffix)
     elif dt.days > 1:
@@ -5547,11 +5547,11 @@ def prettydate(d, T=lambda x: x, utc=False):
     elif dt.days == 1:
         return T('1 day' + suffix)
     elif dt.seconds >= 2 * 60 * 60:
-        return T('%d hours' + suffix) % int(dt.seconds / 3600)
+        return T('%d hours' + suffix) % int(dt.seconds // 3600)
     elif dt.seconds >= 60 * 60:
         return T('1 hour' + suffix)
     elif dt.seconds >= 2 * 60:
-        return T('%d minutes' + suffix) % int(dt.seconds / 60)
+        return T('%d minutes' + suffix) % int(dt.seconds // 60)
     elif dt.seconds >= 60:
         return T('1 minute' + suffix)
     elif dt.seconds > 1:
diff --git a/gluon/utils.py b/gluon/utils.py
index 85d7d49f..3b26a51b 100644
--- a/gluon/utils.py
+++ b/gluon/utils.py
@@ -156,12 +156,12 @@ def get_digest(value):
         raise ValueError("Invalid digest algorithm: %s" % value)
 
 DIGEST_ALG_BY_SIZE = {
-    128 / 4: 'md5',
-    160 / 4: 'sha1',
-    224 / 4: 'sha224',
-    256 / 4: 'sha256',
-    384 / 4: 'sha384',
-    512 / 4: 'sha512',
+    128 // 4: 'md5',
+    160 // 4: 'sha1',
+    224 // 4: 'sha224',
+    256 // 4: 'sha256',
+    384 // 4: 'sha384',
+    512 // 4: 'sha512',
 }
 
 
diff --git a/gluon/validators.py b/gluon/validators.py
index 084661a1..1d9dddcf 100644
--- a/gluon/validators.py
+++ b/gluon/validators.py
@@ -2767,7 +2767,7 @@ class LazyCrypt(object):
         else:
             digest_alg, key = self.crypt.digest_alg, ''
         if self.crypt.salt:
-            if self.crypt.salt:
+            if self.crypt.salt is True:
                 salt = str(web2py_uuid()).replace('-', '')[-16:]
             else:
                 salt = self.crypt.salt