6.034, 6.046 (now 6.006), 6.001 (now 6.01), 6.02 all use Python. There are/will be more most likely. These are all new or refurbished classes to support the new curriculum. That's a pretty major shift.

I've helped a number of people with their 6.00 work and read quite a bit of the course material and I have to respectfully disagree. Students in 6.00 don't learn anywhere near what was taught in 6.001.