I try to import negated from 03_a_ImportPredefinedWordLists.py (where negated along with some other functions is stored). I tried what is suggested in this post
from 03_a_ImportPredefinedWordLists import negated
Python complains about syntax error because the .py starts with a number. 
 File "<ipython-input-12-fc574baf5a3f>", line 1
    from 03_a_ImportPredefinedWordLists import negated
           ^
 SyntaxError: invalid token
If I rename the .py file to ImportPredefinedWordLists, it works fine. Given there are many .py files, I numbered them, to keep track. I would not like to change that unless I have to. Is there a "workaround". I tried to escape using \ but could not get it working
 
    