[英]Compare Two Lists of Dictionaries and Output diffs
我有 2 个需要比较和输出报告差异的字典列表
我需要:
处理:
new_list = [
{'datetime': '2018-08-01', 'evar1': 'newRecord', 'event16': '100', 'event15': '200'},
{'datetime': '2018-08-02', 'evar1': 'duplicateRecord', 'event16': '10', 'event15': '20'},
{'datetime': '2018-08-03', 'evar1': 'diffEvent', 'event16': '15', 'event15': '25'}
]
old_list = [
{'datetime': '2018-08-02', 'evar1': 'duplicateRecord', 'event16': '10', 'event15': '20'},
{'datetime': '2018-08-03', 'evar1': 'diffEvent', 'event16': '10', 'event15': '25'}
]
结果应如下所示:
updated_list = [
{'datetime': '2018-08-01', 'evar1': 'newRecord', 'evar3': 'site', 'event16': '100', 'event15': '200'},
{'datetime': '2018-08-03', 'evar1': 'diffEvent', 'evar3': 'site', 'event16': '5', 'event15': '25'}
]
我试过这个:
updated_list = []
for new_item in new_list:
for old_item in old_list:
for key, value in new_item.iteritems():
# If values don't match, subtract old_list value from new_list values and append the diff
if any(ko == key for ko, vo in old_item.iteritems()):
ko, vo = [(ko, vo) for (ko, vo) in old_item.iteritems() if ko == key][0]
if vo != value:
new_value = value - vo
new_item.update({ko: new_value})
updated_list.append(new_item)
else:
# If record does not exist in old_list, append the new record
updated_list.append(new_item)
确实非常令人困惑的任务! 这是我的解决方案(评论应该解释方法)。
#init a list to store the dictionaries
updated_list = []
#define our 'special keys'
events = ('event15', 'event16')
#remove duplicates from both lists (where all key, values match) - case (2)
old_list_no_dupes = [d for d in old_list if not any(d == dd for dd in new_list)]
new_list_no_dupes = [d for d in new_list if not any(d == dd for dd in old_list)]
for d in new_list_no_dupes:
#iterate over all the dictionaries in old_list for case (3)
for dd in old_list_no_dupes:
#continue to next if not every pair (but event*) matches
if any(k not in dd or dd[k] != v for k,v in d.items() if k not in events):
continue
#iterate the to event keys
for k in events:
#check both dictionaries have that key and they are different values
if k in d and k in dd and d[k] != dd[k]:
#update the new dictionary to be the absolute difference
d[k] = str(abs(int(dd[k]) - int(d[k])))
#append our new dictionary - cases (1), (3) and (4)
updated_list.append(d)
[{'datetime':'2018-08-01', 'evar1':'newRecord', 'event16':'100', 'event15': '200'},
{'datetime':'2018-08-03', 'evar1':'diffEvent', 'event16':'5', 'event15': '25'}]
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