Why if/else will eventually bite you

switch_case_considered_harmful.py

# option 3 (ternary)
for perm in ['modify', 'view', 'execute']:
    fn = assign_perm if request.POST[perm] == "public" else remove_perm
    fn(perm, anon, rs)

# option 3.1 (switch/case-in-a-dict)
fn_selector = {"public"  : assign_perm,
               "private" : remove_perm }
for perm in ['modify', 'view', 'execute']:
    fn_selector[request.POST[perm]](perm, anon, rs) 

# option 3.1.5 (switch/case-in-a-dict)
fn_selector = {"public"         : assign_perm,
               "private"        : remove_perm,
               "acl_controlled" : ACLify_perm}
for perm in ['modify', 'view', 'execute']:
    fn_selector[request.POST[perm]](perm, anon, rs)