循環列表的字典和結合具有相同ID的字典

我有一個列表dicts在那裏我需要合併包含相同的ID鍵/ val的多個字典。我目前所做的並不奏效，它只輸出一個新格式的字典，但格式正確，但我需要將所有合併的字典放在一個新列表中（或有變異的地方，我並不太在乎））。循環列表的字典和結合具有相同ID的字典

該列表並沒有真正具有相同ID的多少個字符可能存在的最小值或最大值，它是另一個變化函數的輸出。

這裏就是我有類型的字典的

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"}]

所需的輸出：

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"}]

我的可怕和不正確迄今爲止嘗試：

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)

，輸出...

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

來源

2017-07-27 DjH

您在所需的輸出中重複鍵：'constraintDate'。 –

糟糕，看起來只是第一個。固定。 – DjH

爲什麼'NoteText'：'Note update text''丟失ID 1？ –

您可以將新數據添加到dict而不是list其中關鍵是要成爲ID。獲得預期的字典呼叫列表。 values()在字典稍後。

>>> 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'}]

來源

2017-07-27 13:08:53

剛剛測試過，看起來像那樣，謝謝！ – DjH

循環列表的字典和結合具有相同ID的字典

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