Remove keys from a list of dicts

gistfile1.py

# list comprehension + dict comprehension should be memory efficient and can remove multiple keys
# but code is ugly
clean_list = [
    {k: v
     for k, v in dict_to_clean.iteritems()
     if k not in ['tid', 'aid']}
    for dict_to_clean in my_list]
 
# lambda can remove only one key and I hate lambdas
map(lambda d: d.pop('tid'), my_list)

# simple for loop can remove multiple keys
for d in my_list:
    del d['tid']
    del d['aid']

# What is yours ?

In my code my_list is not a list but a mongo cursor, so lambda and for loop need a first step.
my_list = list(messages_q)