delallea/Theano — comment on commit 3825925b6e44063fc90d03ac0e0fe07738990ff0
File:  line 0
By delallea:

It's just a habit... I find it easier to systematically use izip instead of trying to analyze the code to figure out of it makes a difference in performance ;)
As a side note, the resulting code when converting to python3 with 2to3 is cleaner with izip (using zip will make it write list(zip(...))).