CodeParser not opening source files with proper decoder
In CodeParser.init() you will notice that it is opening a source file and then reading it, relying on the default encoding for open(). This can trigger a UnicodeDecodeError if the source file specifies an explicit encoding other than Unicode (on Python 3).
For example, in Python's stdlib, Lib/sqlite3/test/dbapi.py has a specified encoding of ISO-8859-1. But because the CodeParser doesn't use something like tokenize.detect_encoding() (http://docs.python.org/py3k/library/tokenize.html#tokenize.detect_encoding) the read fails as there is some bytes in there not allowed under UTF-8 but are valid under ISO-8859-1.