循环列表的字典和结合具有相同ID的字典

我有一个列表dicts在那里我需要合并包含相同的ID键/ val的多个字典。我目前所做的并不奏效，它只输出一个新格式的字典，但格式正确，但我需要将所有合并的字典放在一个新列表中（或有变异的地方，我并不太在乎））。循环列表的字典和结合具有相同ID的字典

该列表并没有真正具有相同ID的多少个字符可能存在的最小值或最大值，它是另一个变化函数的输出。

这里就是我有类型的字典的

列表：

# actual ID's are longer and alphanumeric, this is for simplicity. 
# dicts with same ID will also have the same 'taskConstraint', 
# but that is a side effect and can't be used as a filter 
test_update_list = [ 
{"ID":"1","taskConstraint": "FIXT","plannedCompletionDate":"2017-07-29","constraintDate":"2017-07-29"}, 
{"ID":"1","taskConstraint": "FIXT","plannedStartDate":"2017-07-25","constraintDate":"2017-07-25"}, 
{"ID":"2","taskConstraint": "MSO","plannedCompletionDate":"2017-07-29","constraintDate":"2017-07-29"}, 
{"ID":"1","taskConstraint": "FIXT","noteText": "Note update text"}, 
{"ID":"2","taskConstraint": "MSO","noteText": "Note update text"}, 
{"ID":"3","taskConstraint": "MFO","noteText": "Note update text"}, 
{"ID":"3","taskConstraint": "MFO","plannedStartDate":"2017-07-25","constraintDate":"2017-07-25"}]

所需的输出：

desired_output = [ 
{"ID":"1","taskConstraint":"FIXT","plannedStartDate":"2017-07-25","constraintDate":"2017-07-25","plannedCompletionDate":"2017-07-29"}, 
{"ID":"2","taskConstraint": "MSO","plannedCompletionDate":"2017-07-29","constraintDate":"2017-07-29","noteText": "Note update text"}, 
{"ID":"3","taskConstraint": "MFO","plannedStartDate":"2017-07-25","constraintDate":"2017-07-25","noteText": "Note update text"}]

我的可怕和不正确迄今为止尝试：

test_update_list = [ 
{"ID":"1","taskConstraint": "FIXT","plannedCompletionDate":"2017-07-29","constraintDate":"2017-07-29"}, 
{"ID":"1","taskConstraint": "FIXT","plannedStartDate":"2017-07-25","constraintDate":"2017-07-25"}, 
{"ID":"2","taskConstraint": "MSO","plannedCompletionDate":"2017-07-29","constraintDate":"2017-07-29"}, 
{"ID":"1","taskConstraint": "FIXT","noteText": "Note update text"}, 
{"ID":"2","taskConstraint": "MSO","noteText": "Note update text"}, 
{"ID":"3","taskConstraint": "MFO","noteText": "Note update text"}, 
{"ID":"3","taskConstraint": "MFO","plannedStartDate":"2017-07-25","constraintDate":"2017-07-25"}] 

new_update_list = [] 

for task in test_update_list: 
    if len(new_update_list) > 0 and task not in new_update_list: 
     for new_task in new_update_list: 
      if task['ID'] == new_task['ID']: 
       new_task = { **task, **new_task } 
    else: 
     new_update_list.append(task)

print(new_update_list)

，输出...

[{'ID': '1', 'plannedCompletionDate': '2017-07-29', 'constraintDate': '2017-07-29', 'taskConstraint': 'FIXT'}]

来源

2017-07-27 DjH

您在所需的输出中重复键：'constraintDate'。 –

糟糕，看起来只是第一个。固定。 – DjH

为什么'NoteText'：'Note update text''丢失ID 1？ –

您可以将新数据添加到dict而不是list其中关键是要成为ID。获得预期的字典呼叫列表。 values()在字典稍后。

>>> d = {}  
>>> for dct in test_update_list: 
...  d.setdefault(dct['ID'], {}).update(dct) 
... 

>>> pprint(list(d.values())) 
[{'ID': '1', 
    'constraintDate': '2017-07-25', 
    'noteText': 'Note update text', 
    'plannedCompletionDate': '2017-07-29', 
    'plannedStartDate': '2017-07-25', 
    'taskConstraint': 'FIXT'}, 
{'ID': '2', 
    'constraintDate': '2017-07-29', 
    'noteText': 'Note update text', 
    'plannedCompletionDate': '2017-07-29', 
    'taskConstraint': 'MSO'}, 
{'ID': '3', 
    'constraintDate': '2017-07-25', 
    'noteText': 'Note update text', 
    'plannedStartDate': '2017-07-25', 
    'taskConstraint': 'MFO'}]

来源

2017-07-27 13:08:53

刚刚测试过，看起来像那样，谢谢！ – DjH

循环列表的字典和结合具有相同ID的字典

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