Python Advocacy and "hard" data

[Iwan van der Kleyn]

Recently I've been trying to convince a customer to switch to Python. I 
can cough up the party line when advocating Python and that proves 
relatively successfull. However, when pressed for "hard data" I am at a 
loss. With hard data the customer means esentially: "ok, you claim that 
Python increases productivity, but where can I find proof of that?".

In other words, what I need is not apocryphal stories from the converted 
but "objective" (haha) reports from institutions like Gartner or 
statements from universitites or companies praising Python's qualities.

Are these anywhere to be found?

Regards,

Iwan