添加两个已经在同一列表中的字典

时间：2019-11-12 15:35:10

标签： python pandas list dictionary

我有一列50983行。每行都有一个列表，其中有两个或多个字典。我想在一本字典中制作所有词典。我想在每个字典中更新此ID。我用过：

l=[{'id':'abc12vr'},{'createdAt': '2018-12-18T16:09:57.098Z',
  'notes': 'Candidate initial submission.',
  'createdBy': 'Steven Klinger'},
 {'createdAt': '2018-12-18T23:14:09.415Z',
  'notes': 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>',
  'createdBy': 'Matt'},
 {'createdAt': '2019-01-22T16:04:46.958Z',
  'notes': 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>',
  'createdBy': 'Matt'},
 {'createdAt': '2018-12-18T16:09:57.098Z',
  'notes': 'Candidate initial submission.',
  'createdBy': 'Steven Klinger'},
 {'createdAt': '2018-12-18T23:14:09.415Z',
  'notes': 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>',
  'createdBy': 'Matt'},
 {'createdAt': '2019-01-22T16:04:46.958Z',
  'notes': 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>',
  'createdBy': 'Matt'}]

id_dict = [d for d in l if 'id' in d][0]
merge = [{**d,**id_dict} for d in l if 'id' not in d]

但是我只有一本字典只得到最后一行，我希望每一行

4 个答案:

答案 0 :(得分：1)

这是我在stackflow中的首次回答，希望对您有所帮助！

您只能使用单个字典获得最后一行，我希望每一行-因为字典必须具有唯一键，并且由于字典中的所有键都相同，因此python会不断覆盖这些键。

下面的代码确实会将所有字典合并为一个字典，并在其键后附加一个计数器值以使键唯一。

merged_dict={}
counter=0
def merge_logic(dict_para):
    #print dict_val
    global counter
    for key,value in dict_para.items():    
        merged_dict[key+"_"+str(counter)]=value
        counter+=1
id_dict = [merge_logic(d) for d in l if isinstance(d,dict)]

print merged_dict

输出： 

    {'createdAt_11': '2018-12-18T16:09:57.098Z', 
'notes_0': 'Candidate initial submission.', 
'notes_3': 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>', 
'createdAt_14': '2018-12-18T23:14:09.415Z', 
'createdAt_17': '2019-01-22T16:04:46.958Z', 
'notes_6': 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>', 
'notes_9': 'Candidate initial submission.', 
'createdBy_13': 'Matt', 
'notes_12': 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>', 
'createdAt_5': '2018-12-18T23:14:09.415Z', 
'notes_15': 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>', 
'createdAt_2': '2018-12-18T16:09:57.098Z', 
'createdBy_4': 'Matt', 
'createdBy_7': 'Matt', 
'createdBy_1': 'Steven Klinger', 
'createdAt_8': '2019-01-22T16:04:46.958Z', 
'createdBy_10': 'Steven Klinger', 
'createdBy_16': 'Matt'}

希望这会有所帮助！

答案 1 :(得分：0)

似乎像this的答案应该有所帮助（尽管不确定，因为您没有提供所需的输出）：

d = {}
for i in l:
    for k in i.keys():
        d[k] = list(d[k] for d in l)

{'createdAt': ['2018-12-18T16:09:57.098Z', '2018-12-18T23:14:09.415Z', '2019-01-22T16:04:46.958Z', '2018-12-18T16:09:57.098Z', '2018-12-18T23:14:09.415Z', '2019-01-22T16:04:46.958Z'], 'notes': ['Candidate initial submission.', 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>', 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>', 'Candidate initial submission.', 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>', 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>'], 'createdBy': ['Steven Klinger', 'Matt', 'Matt', 'Steven Klinger', 'Matt', 'Matt']}

答案 2 :(得分：0)

这使数据通过了一遍：

from collections import defaultdict

output_dict = defaultdict(list)

for d in l:
    for key in d:
        output_dict[key].append(d[key])

>>> output

defaultdict(list,
            {'createdAt': ['2018-12-18T16:09:57.098Z',
              '2018-12-18T23:14:09.415Z',
              '2019-01-22T16:04:46.958Z',
              '2018-12-18T16:09:57.098Z',
              '2018-12-18T23:14:09.415Z',
              '2019-01-22T16:04:46.958Z'],
             'notes': ['Candidate initial submission.',
              'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>',
              'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>',
              'Candidate initial submission.',
              'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>',
              'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>'],
             'createdBy': ['Steven Klinger',
              'Matt',
              'Matt',
              'Steven Klinger',
              'Matt',
              'Matt']})

答案 3 :(得分：0)

  

原始答案

我假设您需要一个键，并且该键的所有值都将附加在列表中。在这里，我使用了setdefault的{​​{1}}方法来实现它。

dictionary
  

修改后的答案

# Input
l=[{'createdAt': '2018-12-18T16:09:57.098Z',
  'notes': 'Candidate initial submission.',
  'createdBy': 'Steven Klinger'},
 {'createdAt': '2018-12-18T23:14:09.415Z',
  'notes': 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>',
  'createdBy': 'Matt'},
 {'createdAt': '2019-01-22T16:04:46.958Z',
  'notes': 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>',
  'createdBy': 'Matt'},
 {'createdAt': '2018-12-18T16:09:57.098Z',
  'notes': 'Candidate initial submission.',
  'createdBy': 'Steven Klinger'},
 {'createdAt': '2018-12-18T23:14:09.415Z',
  'notes': 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>',
  'createdBy': 'Matt'},
 {'createdAt': '2019-01-22T16:04:46.958Z',
  'notes': 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>',
  'createdBy': 'Matt'}]

# Main code
res = {} # defined output dict
for i in l: # for loop to fetch each element(dict) inside a list
    for k, v in i.items(): # to fetch key value fair of each dict
        res.setdefault(k, []).append(v) # setdefault method of add key to result and created an empty list and appended value to it.  
print (res) # print result

# Output
# {'createdAt': ['2018-12-18T16:09:57.098Z', '2018-12-18T23:14:09.415Z', '2019-01-22T16:04:46.958Z', '2018-12-18T16:09:57.098Z', '2018-12-18T23:14:09.415Z', '2019-01-22T16:04:46.958Z'], 'notes': ['Candidate initial submission.', 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>', 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>', 'Candidate initial submission.', 'The Candidate Status has now been updated from <strong>CV Submitted</strong> and <strong>Feedback Pending</strong> to <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong>', 'The Candidate Status has now been updated from <strong>Client CV Review</strong> and <strong>Feedback Awaiting</strong> to <strong>Client CV Review</strong> and <strong>Position on Hold</strong>'], 'createdBy': ['Steven Klinger', 'Matt', 'Matt', 'Steven Klinger', 'Matt', 'Matt']}

我希望这对您有所帮助！

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