Commercial Debian Connector/Python packages included a copyright file containing a GPL license. (Bug #18422727)

For Django, introspecting to get the primary key of MySQL tables could fail in Python 3. (Bug #72001, Bug #18380100)

In prepared statements, Unicode arguments in Python 2 and bytes arguments in Python 3 were causing errors, as were the symbols of character sets other than utf8 or ascii. (Bug #71482, Bug #18144971)