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Build a nested dictionary with a list
The Next CEO of Stack OverflowHow to merge two dictionaries in a single expression?How do I check if a list is empty?How do I sort a list of dictionaries by a value of the dictionary?How can I safely create a nested directory in Python?How do I sort a dictionary by value?How to make a flat list out of list of lists?Add new keys to a dictionary?Check if a given key already exists in a dictionaryHow do I list all files of a directory?Iterating over dictionaries using 'for' loops
I am struggling with how to define a list and append to it while looping through parsed json doc. I can't append to the list that's not defined. But I don't want to set to empty list, as that would override values I had in it in next iteration. This is what I have:
from collections import defaultdict
nested_dict = lambda: defaultdict(nested_dict)
hash = nested_dict()
for e in decoded_jason['volumeList']:
volumeName = e['name']
volumeType = e['volumeType']
if volumeType == 'Snapshot':
consistencyGroupId = e['consistencyGroupId']
#I am missing a step here to initialize empty list so I can append
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
if I do this before append, it works, but then the list will be set to empty in next iteration:
hash['map']['consistencyGroup'][consistencyGroupId]=[]
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
python
edited Mar 21 at 18:23
petezurich
3,76581936
asked Mar 21 at 18:12
MarjanaMarjana
61
add a comment |
I am struggling with how to define a list and append to it while looping through parsed json doc. I can't append to the list that's not defined. But I don't want to set to empty list, as that would override values I had in it in next iteration. This is what I have:
from collections import defaultdict
nested_dict = lambda: defaultdict(nested_dict)
hash = nested_dict()
for e in decoded_jason['volumeList']:
volumeName = e['name']
volumeType = e['volumeType']
if volumeType == 'Snapshot':
consistencyGroupId = e['consistencyGroupId']
#I am missing a step here to initialize empty list so I can append
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
if I do this before append, it works, but then the list will be set to empty in next iteration:
hash['map']['consistencyGroup'][consistencyGroupId]=[]
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
python
edited Mar 21 at 18:23
petezurich
3,76581936
asked Mar 21 at 18:12
MarjanaMarjana
61
Please post your JSON data, its very hard to visualize
– Kunal Mukherjee
Mar 21 at 18:15
add a comment |
I am struggling with how to define a list and append to it while looping through parsed json doc. I can't append to the list that's not defined. But I don't want to set to empty list, as that would override values I had in it in next iteration. This is what I have:
from collections import defaultdict
nested_dict = lambda: defaultdict(nested_dict)
hash = nested_dict()
for e in decoded_jason['volumeList']:
volumeName = e['name']
volumeType = e['volumeType']
if volumeType == 'Snapshot':
consistencyGroupId = e['consistencyGroupId']
#I am missing a step here to initialize empty list so I can append
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
if I do this before append, it works, but then the list will be set to empty in next iteration:
hash['map']['consistencyGroup'][consistencyGroupId]=[]
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
python
edited Mar 21 at 18:23
petezurich
3,76581936
asked Mar 21 at 18:12
MarjanaMarjana
61
I am struggling with how to define a list and append to it while looping through parsed json doc. I can't append to the list that's not defined. But I don't want to set to empty list, as that would override values I had in it in next iteration. This is what I have:
from collections import defaultdict
nested_dict = lambda: defaultdict(nested_dict)
hash = nested_dict()
for e in decoded_jason['volumeList']:
volumeName = e['name']
volumeType = e['volumeType']
if volumeType == 'Snapshot':
consistencyGroupId = e['consistencyGroupId']
#I am missing a step here to initialize empty list so I can append
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
if I do this before append, it works, but then the list will be set to empty in next iteration:
hash['map']['consistencyGroup'][consistencyGroupId]=[]
hash['map']['consistencyGroup'][consistencyGroupId].append(volumeName)
python
python
edited Mar 21 at 18:23
petezurich
3,76581936
asked Mar 21 at 18:12
MarjanaMarjana
61
edited Mar 21 at 18:23
petezurich
3,76581936
asked Mar 21 at 18:12
MarjanaMarjana
61
edited Mar 21 at 18:23
petezurich
3,76581936
edited Mar 21 at 18:23
petezurich
3,76581936
edited Mar 21 at 18:23
petezurich
3,76581936
3,76581936
asked Mar 21 at 18:12
MarjanaMarjana
61
asked Mar 21 at 18:12
MarjanaMarjana
61
asked Mar 21 at 18:12
MarjanaMarjana
61
61
Please post your JSON data, its very hard to visualize
– Kunal Mukherjee
Mar 21 at 18:15
add a comment |
Please post your JSON data, its very hard to visualize
– Kunal Mukherjee
Mar 21 at 18:15
Please post your JSON data, its very hard to visualize
– Kunal Mukherjee
Mar 21 at 18:15
Please post your JSON data, its very hard to visualize
– Kunal Mukherjee
Mar 21 at 18:15
add a comment |
1 Answer
1
active
oldest
votes
Make your final line be:
hash['map']['consistencyGroup'].setdefault(consistencyGroupId, []).append(volumeName)
setdefault either returns the value for the key if it's present, or, if it's not, sets it to the provided default ([] in this case), and then returns that.
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Make your final line be:
hash['map']['consistencyGroup'].setdefault(consistencyGroupId, []).append(volumeName)
setdefault either returns the value for the key if it's present, or, if it's not, sets it to the provided default ([] in this case), and then returns that.
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
add a comment |
Make your final line be:
hash['map']['consistencyGroup'].setdefault(consistencyGroupId, []).append(volumeName)
setdefault either returns the value for the key if it's present, or, if it's not, sets it to the provided default ([] in this case), and then returns that.
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
add a comment |
Make your final line be:
hash['map']['consistencyGroup'].setdefault(consistencyGroupId, []).append(volumeName)
setdefault either returns the value for the key if it's present, or, if it's not, sets it to the provided default ([] in this case), and then returns that.
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
Make your final line be:
hash['map']['consistencyGroup'].setdefault(consistencyGroupId, []).append(volumeName)
setdefault either returns the value for the key if it's present, or, if it's not, sets it to the provided default ([] in this case), and then returns that.
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
answered Mar 21 at 18:17
DonnieDonnie
35.4k75478
35.4k75478
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
add a comment |
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
Thank you Donnie, that works! I was trying with setdefault but I wasn't using it correctly (instead of consistencyGroupId, I had the whole hash thing.
– Marjana
Mar 21 at 18:27
add a comment |
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Please post your JSON data, its very hard to visualize
– Kunal Mukherjee
Mar 21 at 18:15