Given two modules, I've seen the following kind of strange behavior with
list sorting on import and delete; a list that has been imported, sorted
and deleted remains sorted on a second import:

my_module.py:

some_list = ['b','a']

other_module.py:

from  my_module import some_list
print some_list
some_list.sort()
print some_list
del some_list
from  my_module import some_list
print some_list

Output is:

['b','a']
['a','a']
['a','b']

Sorry if it's already been reported.