Make sure pretty_hex works under Python 2 and Python 3.

 * Run doctests under tox.
 * Add pretty_hex doctests for string, bytes and unicode types.

Fixes #48

Author: mithro

programmer/check_doctests.py

@@ -0,0 +1,4 @@
+#!/usr/bin/env python
+import doctest
+import tinyprog
+doctest.testmod(tinyprog)

programmer/tinyprog/__init__.py

@@ -33,18 +33,30 @@
 
 
 def pretty_hex(data):
-    output = ""
+    """
+    >>> print(pretty_hex("abc123"))
+    61 62 63 31 32 33
+    >>> print(pretty_hex(b"abc123"))
+    61 62 63 31 32 33
+    >>> print(pretty_hex(u"abc123"))
+    61 62 63 31 32 33
+    >>> print(pretty_hex("\\x00a\\x02"*12))
+    00 61 02 00 61 02 00 61 02 00 61 02 00 61 02 00
+    61 02 00 61 02 00 61 02 00 61 02 00 61 02 00 61
+    02 00 61 02
+    """
+    output = []
     for i in range(0, len(data), 16):
-        output += " ".join(["%02x" % ord(x) for x in data[i:i + 16]]) + "\n"
-    return output
+        output.append(" ".join("%02x" % to_int(x) for x in data[i:i + 16]))
+    return "\n".join(output)
 
 
 def to_int(value):
     """
     >>> to_int('A')
     65
     >>> to_int(0xff)
-    256
+    255
     >>> list(to_int(i) for i in ['T', 'i', 'n', 'y', 0xff, 0, 0])
     [84, 105, 110, 121, 255, 0, 0]
     """

programmer/tox.ini

@@ -16,6 +16,7 @@ commands =
     python setup.py --version
     check-manifest --ignore tox.ini,tinyprog/full_version.py
     python setup.py check -m -s
+    python check_doctests.py
     flake8 --exclude=data_tables.py setup.py tinyprog
     python setup.py install
     tinyprog --help