In my taste, using generator expressions with conditions actually doesn't look very readable; it hides the set-membership test under the syntactic clutter.
You might try different indentation. I find that I write a lot of my list comprehensions and generator expressions like:
dict((k, v)
for k, v in d.iteritems()
if k in s)It looks much more like the for-loop in my mind, and I can easily spot each of the for- and if-expressions in the genexp.
STeVe -- http://mail.python.org/mailman/listinfo/python-list
