def pg_list(name, default=''):
"""Retrieve a serialized (comma-separated) list from a POST request.
Duplicated and empty elements are removed
"""
s = request.POST.get(name, default)
li = clean(s).strip().split(',')
item_set = set(li)
if '' in item_set:
item_set.remove('')
return list(item_set)
def pg(name, default=''):
"""Retrieve an element from a POST request"""
s = request.POST.get(name, default)[:64]
return clean(s).strip()
