diff --git a/chardet/__init__.py b/chardet/__init__.py
index acc8072e..4c7edddc 100644
--- a/chardet/__init__.py
+++ b/chardet/__init__.py
@@ -34,7 +34,7 @@ def detect(byte_str):
     if not isinstance(byte_str, bytearray):
         if not isinstance(byte_str, bytes):
             raise TypeError('Expected object of type bytes or bytearray, got: '
-                            '{0}'.format(type(byte_str)))
+                            '{}'.format(type(byte_str)))
         else:
             byte_str = bytearray(byte_str)
     detector = UniversalDetector()
@@ -52,7 +52,7 @@ def detect_all(byte_str):
     if not isinstance(byte_str, bytearray):
         if not isinstance(byte_str, bytes):
             raise TypeError('Expected object of type bytes or bytearray, got: '
-                            '{0}'.format(type(byte_str)))
+                            '{}'.format(type(byte_str)))
         else:
             byte_str = bytearray(byte_str)
 
diff --git a/chardet/cli/chardetect.py b/chardet/cli/chardetect.py
index 9ab62015..e1d8cd69 100755
--- a/chardet/cli/chardetect.py
+++ b/chardet/cli/chardetect.py
@@ -44,10 +44,10 @@ def description_of(lines, name='stdin'):
     if PY2:
         name = name.decode(sys.getfilesystemencoding(), 'ignore')
     if result['encoding']:
-        return '{0}: {1} with confidence {2}'.format(name, result['encoding'],
+        return '{}: {} with confidence {}'.format(name, result['encoding'],
                                                      result['confidence'])
     else:
-        return '{0}: no result'.format(name)
+        return '{}: no result'.format(name)
 
 
 def main(argv=None):
@@ -68,7 +68,7 @@ def main(argv=None):
                         type=argparse.FileType('rb'), nargs='*',
                         default=[sys.stdin if PY2 else sys.stdin.buffer])
     parser.add_argument('--version', action='version',
-                        version='%(prog)s {0}'.format(__version__))
+                        version='%(prog)s {}'.format(__version__))
     args = parser.parse_args(argv)
 
     for f in args.input: