Convert Nested Json to a single Key Value Pair - python-3.x

Question

I have a list of Keys :
Server
Date
Severity
process
message
If there is a key "events" in my Dictionary, I need to replace the key with "Message" and the value of "indicator-type" will become the value of the message
List1=[
{
"server": "10.10.0.123",
"date": 1561994754,
"severity": "INFO",
"process": "webapp",
"message": "server started."
},
{
"server": "10.10.0.202",
"date": 1561994757000,
"source": "jvm-x994a",
"events": [{
"indicator-type": "memory-low"
}]
},
{
"server": "10.10.0.202",
"date": 1561994773000,
"source": "jvm-x994a",
"events": [{
"indicator-type": "memory-low"
}
]
}
]
Expected output:
List1=[
{
"server": "10.10.0.123",
"date": 1561994754,
"severity": "INFO",
"process": "webapp",
"message": "server started."
},
{
"server": "10.10.0.202",
"date": 1561994757000,
"source": "jvm-x994a",
"message": "memory-low"
},
{
"server": "10.10.0.202",
"date": 1561994773000,
"source": "jvm-x994a",
"message": "memory-low"
}
]
}
]
So Far I have Tried :
In the below code I am trying to check for the "events" key and replacing it with the "message" key, but when I am printing it is not replacing they key-value
output = []
d={}
for x in a:
d['server']=x['server']
if (str(x['date']).isdigit() == True):
d['date'] =2
# datetime.datetime.fromtimestamp(x['date'] / 1000.0).strftime('%Y-%m-%d %H:%M:%S.%f')
if ("events" in x):
for i in (x['events']):
if (i['indicator-level'] == 3):
d['severity'] = "INFO"
if (i['indicator-level'] == 7):
d['severity'] = "WARN"
if (i['indicator-type'] != None):
d['message'] = i['indicator-type']

Answer 1

Clean out the dictionary first before moving on to the next step.
def handle_events_key(dict_):
"""
Adds a new 'message' key to 'dict_' based on 'events' key.
Returns a new dictionary without the 'events' key.
"""
if 'events' in dict_:
dict_['message'] = dict_['events'][0]['indicator-type']
return {key: value for key, value in dict_.items() if key != 'events'}
def events_key_to_message(list_):
return [handle_events_key(dict_) for dict_ in list_]
# Usage
# List1 = ...
# Cleaning out the dictionary.
ListUpdated = events_key_to_message(List1)

Answer 2

Try this. I have modified the events handling parts.
output = []
for item in List1:
d = {}
d['server'] = item['server']
if (str(item['date']).isdigit() == True):
d['date'] =2
# datetime.datetime.fromtimestamp(x['date'] / 1000.0).strftime('%Y-%m-%d %H:%M:%S.%f')
# get will give you None and not raise an exception if there is no events key.
if item.get('events') is not None:
for event in item['events']:
if event.get('indicator-level') == 3: d['severity'] = "INFO"
if event.get('indicator-level') == 7: d['severity'] = "WARN"
if event.get('indicator-type') is not None: d['message'] = event['indicator-type']
output.append(d)
print(output)
# [{'server': '10.10.0.123', 'date': 2}, {'server': '10.10.0.202', 'date': 2, 'message': 'memory-low'}, {'server': '10.10.0.202', 'date': 2, 'message': 'memory-low'}]