diff --git a/termenu-cmd b/termenu-cmd
index 26181f2..77989fa 100755
--- a/termenu-cmd
+++ b/termenu-cmd
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import re
 import sys
 import termenu
diff --git a/termenu/colors.py b/termenu/colors.py
index c030a97..f9221ef 100644
--- a/termenu/colors.py
+++ b/termenu/colors.py
@@ -169,12 +169,14 @@ def inner(self, *args):
 
     def __getitem__(self, idx):
         if isinstance(idx, slice) and idx.step is None:
+            start = idx.start or 0
+            stop = idx.stop or len(self)
             cursor = 0
             tokens = []
             for token in self.tokens:
-                tokens.append(token[max(0, idx.start - cursor):idx.stop - cursor])
+                tokens.append(token[max(0, start - cursor):stop - cursor])
                 cursor += len(token)
-                if cursor > idx.stop:
+                if cursor > stop:
                     break
             return self.__class__("".join(t.raw() for t in tokens if t))
 
diff --git a/termenu/termenu.py b/termenu/termenu.py
index 2abf1ed..f389578 100644
--- a/termenu/termenu.py
+++ b/termenu/termenu.py
@@ -571,16 +571,16 @@ def redirect_std():
     stdin = sys.stdin
     stdout = sys.stdout
     if not sys.stdin.isatty():
-        sys.stdin = open("/dev/tty", "r", 0)
+        sys.stdin = open("/dev/tty", "rb", 0)
     if not sys.stdout.isatty():
-        sys.stdout = open("/dev/tty", "w", 0)
+        sys.stdout = open("/dev/tty", "wb", 0)
     return stdin, stdout
 
 
 def shorten(s, l=100):
     if len(s) <= l or l < 3:
         return s
-    return s[:l/2-2] + "..." + s[-l/2+1:]
+    return s[:l//2-2] + "..." + s[-l//2+1:]
 
 
 try: