是否有可能为github做自动提交。(Is it possible to do auto-commit for github.)

 你可以使用嵌套的字典，嵌套的defaultdicts或Trie 。 
 
 使用标准的字典，你可以使用setdefault ： 
 
tree = {}
tree.setdefault(cmd, {}).setdefault(cmd_type, {}).setdefault(dimension, []).append(prop)
 
 它会给你一个列表字典的字典。 如果你想在树叶上设置，你可以使用： 
 
tree.setdefault(cmd, {}).setdefault(cmd_type, {}).setdefault(dimension, set()).add(prop)
 
 举个例子： 
 
data = [
  ('cmd1', 'typeA', 3, 'propertyX'),
  ('cmd1', 'typeA', 3, 'propertyZ'),
  ('cmd1', 'typeB', 2, 'propertyY'),
  ('cmd2', 'typeA', 3, 'propertyX'),
  ('cmd2', 'typeB', 1, 'propertyZ'),
  ('cmd2', 'typeA', 1, 'propertyX'),
  ('cmd1', 'typeB', 2, 'propertyZ')
] 

tree = {}
for cmd, cmd_type, dimension, prop in data:
    tree.setdefault(cmd, {}).setdefault(cmd_type, {}).setdefault(dimension, []).append(prop)

from pprint import pprint
pprint(tree)
 
 它输出： 
 
{'cmd1': {'typeA': {3: ['propertyX', 'propertyZ']},
          'typeB': {2: ['propertyY', 'propertyZ']}},
 'cmd2': {'typeA': {1: ['propertyX'], 3: ['propertyX']},
          'typeB': {1: ['propertyZ']}}}
 
 使用defaultdicts，您的代码将如下所示： 
 
tree = defaultdict(lambda: defaultdict(lambda: defaultdict(list)))
for cmd, cmd_type, dimension, prop in data:
    tree[cmd][cmd_type][dimension].append(prop)

You could use nested dicts, nested defaultdicts or a Trie.
 
With standard dicts, you'd use setdefault:
 
tree = {}
tree.setdefault(cmd, {}).setdefault(cmd_type, {}).setdefault(dimension, []).append(prop)
 
It would give you a dict of dicts of dicts of lists. If you want sets at the leaves, you could use:
 
tree.setdefault(cmd, {}).setdefault(cmd_type, {}).setdefault(dimension, set()).add(prop)
 
As an example:
 
data = [
  ('cmd1', 'typeA', 3, 'propertyX'),
  ('cmd1', 'typeA', 3, 'propertyZ'),
  ('cmd1', 'typeB', 2, 'propertyY'),
  ('cmd2', 'typeA', 3, 'propertyX'),
  ('cmd2', 'typeB', 1, 'propertyZ'),
  ('cmd2', 'typeA', 1, 'propertyX'),
  ('cmd1', 'typeB', 2, 'propertyZ')
] 

tree = {}
for cmd, cmd_type, dimension, prop in data:
    tree.setdefault(cmd, {}).setdefault(cmd_type, {}).setdefault(dimension, []).append(prop)

from pprint import pprint
pprint(tree)
 
It outputs:
 
{'cmd1': {'typeA': {3: ['propertyX', 'propertyZ']},
          'typeB': {2: ['propertyY', 'propertyZ']}},
 'cmd2': {'typeA': {1: ['propertyX'], 3: ['propertyX']},
          'typeB': {1: ['propertyZ']}}}
 
With defaultdicts, your code would look like:
 
tree = defaultdict(lambda: defaultdict(lambda: defaultdict(list)))
for cmd, cmd_type, dimension, prop in data:
    tree[cmd][cmd_type][dimension].append(prop)