optionalg
diff --git a/‎codext/__common__.py‎
Lines changed: 5 additions & 1 deletion b/‎codext/__common__.py‎
Lines changed: 5 additions & 1 deletion
diff --git a/‎codext/__init__.py‎
Lines changed: 2 additions & 1 deletion b/‎codext/__init__.py‎
Lines changed: 2 additions & 1 deletion
diff --git a/‎codext/base/_base.py‎
Lines changed: 3 additions & 2 deletions b/‎codext/base/_base.py‎
Lines changed: 3 additions & 2 deletions
diff --git a/‎codext/base/baseN.py‎
Lines changed: 4 additions & 4 deletions b/‎codext/base/baseN.py‎
Lines changed: 4 additions & 4 deletions
diff --git a/‎codext/binary/excess3.py‎
Lines changed: 1 addition & 2 deletions b/‎codext/binary/excess3.py‎
Lines changed: 1 addition & 2 deletions
diff --git a/‎codext/binary/rotate.py‎
Lines changed: 1 addition & 1 deletion b/‎codext/binary/rotate.py‎
Lines changed: 1 addition & 1 deletion
@@ -473,7 +473,11 @@ def examples(encoding, number=10):
                 i = 0
                 while i < min(number, len(temp)):
                     if not temp[i].isdigit():
-                        e.append(temp[i])
+                        try:
+                            lookup(temp[i])
+                            e.append(temp[i])
+                        except LookupError:
+                            pass
                     i += 1
         for alias, codec in aliases.items():
             if name == codec:
 
@@ -10,7 +10,8 @@
 from .__info__ import __author__, __copyright__, __email__, __license__, __source__, __version__
 
 
-__all__ = ["add", "add_map", "clear", "decode", "encode", "guess", "lookup",  "open", "register", "remove", "reset"]
+__all__ = ["add", "add_map", "clear", "decode", "encode", "guess", "lookup",  "open", "rank", "register", "remove",
+           "reset"]
 
 decode   = codecs.decode
 encode   = codecs.encode
 
@@ -122,7 +122,8 @@ def base(charset, pattern, pow2=False, encode_template=base_encode, decode_templ
                      the charset)
     :param pow2:    whether the base codec's N is a power of 2
     """
-    n = len(_get_charset(charset))
+    cs = _get_charset(charset)
+    n = len(cs)
     nb = log(n, 2)
     if pow2 and nb != int(nb):
         raise BaseError("Bad charset ; {} is not a power of 2".format(n))
@@ -142,7 +143,7 @@ def _decode(input, errors="strict"):
         return _decode
 
     kwargs['len_charset'] = n
-    kwargs['printables_rate'] = 1.
+    kwargs['printables_rate'] = float(len([c for c in cs if c in printable])) / len(cs)
     n = "base{}".format(n) if name is None else name
     kwargs['guess'] = kwargs.get('guess', [n])
     add(n, encode, decode, pattern, entropy=nb, **kwargs)
 
@@ -13,22 +13,22 @@
 
 
 B2 = {r'': "01", r'[-_]inv(erted)?': "10"}
-base2n(B2, r"^(?:base[-_]?2|bin)(|[-_]inv(?:erted)?|[-_][a-zA-Z0-9]{2})$")
+base2n(B2, r"^(?:base[-_]?2|bin)(|[-_]inv(?:erted)?|[-_](?!.*(.).*\2)[a-zA-Z0-9]{2})$")
 main2 = main(2)
 
 
 B3 = {r'': "123", r'[-_]inv(erted)?': "321"}
-base(B3, r"^base[-_]?3(|[-_]inv(?:erted)?|[-_][a-zA-Z0-9]{3})$")
+base(B3, r"^base[-_]?3(|[-_]inv(?:erted)?|[-_](?!.*(.).*\2)[a-zA-Z0-9]{3})$")
 main3 = main(3)
 
 
 B4 = {r'': "1234", r'[-_]inv(erted)?': "4321"}
-base2n(B4, r"^base[-_]?4(|[-_]inv(?:erted)?|[-_][a-zA-Z0-9]{4})$")
+base2n(B4, r"^base[-_]?4(|[-_]inv(?:erted)?|[-_](?!.*(.).*\2)[a-zA-Z0-9]{4})$")
 main4 = main(4)
 
 
 B8 = {r'': "abcdefgh", r'[-_]inv(erted)?': "hgfedcba"}
-base2n(B8, r"^base[-_]?8(|[-_]inv(?:erted)?|[-_][a-zA-Z0-9]{8})$")
+base2n(B8, r"^base[-_]?8(|[-_]inv(?:erted)?|[-_](?!.*(.).*\2)[a-zA-Z0-9]{8})$")
 main8 = main(8)
 
 
 
@@ -61,6 +61,5 @@ def excess3_decode(text, errors="strict"):
     return r, len(b(text))
 
 
-add("excess3", excess3_encode, excess3_decode, pattern=r"^(?:excess\-?3|xs\-?3|stibitz)$", entropy=1.,
-    printables_rate=.45)
+add("excess3", excess3_encode, excess3_decode, pattern=r"^(?:excess\-?3|xs\-?3|stibitz)$", printables_rate=.45)
 
@@ -47,5 +47,5 @@ def decode(text, errors="strict"):
         return decode
 
 
-    add("rotate", rotate_encode, rotate_decode, r"rotate(?:[-_]?bits)?[-_]?((?:(?:left|right)[-_]?)?[1-7])$", entropy=1.)
+    add("rotate", rotate_encode, rotate_decode, r"rotate(?:[-_]?bits)?[-_]?((?:(?:left|right)[-_]?)?[1-7])$")
Original file line number	Diff line number	Diff line change
`@@ -47,5 +47,5 @@ def decode(text, errors="strict"):`
`47`	`47`	`return decode`
`48`	`48`
`49`	`49`
`50`		`- add("rotate", rotate_encode, rotate_decode, r"rotate(?:[-_]?bits)?[-_]?((?:(?:left\|right)[-_]?)?[1-7])$", entropy=1.)`
	`50`	`+ add("rotate", rotate_encode, rotate_decode, r"rotate(?:[-_]?bits)?[-_]?((?:(?:left\|right)[-_]?)?[1-7])$")`
`51`	`51`