which should work with both (2.x, 3.x) python versions.

Check wich default python version used in your system:
/usr/bin/env python -V
Python 3.2.3

If default is 3.x, than use new wrapper in your crontab.

Note, in python3 required additional PyMySQL module (since MySQLdb unavialable for python3).
In ubuntu/debian install by this cmds:

sudo apt-get install python3-setuptools
sudo easy_install3 pip
sudo pip3 install PyMySQL

How to install on other systems I do not know, welcome your tips.