WTForms serialisation of modules

itertools.py

def select_modules(dictionary):
  return {k: v for k, v in mydict.items() if k.startswith('modules-')}

def module_key(item):
  return item[0].split('-')[1]

def sort_modules(modules):
  return sorted(modules.iteritems(), key=module_key)

def group_modules(modules):
  return (module[1] for module in groupby(modules, key=module_key))

def serialise_group(module):
  return dict([(key.split('-')[2], value) for key, value in module])

map(serialise_group, group_modules(sort_modules(select_modules(modules))))

procedural.py

d = {'modules-0-k1': 'one', 'modules-0-k2': 'two', 'modules-1-k1': 'three', 'modules-1-k2': 'four'}

output = defaultdict(dict)
for k, v in d.items():
  ks = k.split('-')
  output[ks[1]][ks[2]] = v

[v for k, v in sorted(output.items())]