How to club dictionaries?

Question

I've two dictionaries as below.

d1 = {
       "user1":{"key1":"val1","key2":"val2"},
       "user2":{"key3":"val3","key4":"val4"}
     }

d2 = { "admin":{
      "user1":{"key5":"val5","key6":"val6"},
      "user3":{"key7":"val7","key8":"val8"}
                }
     }

Final dictionary should look like this:

d3 = {
              "user1":{"key1":"val1","key2":"val2","key5":"val5","key6":"val6"},
              "user2":{"key3":"val3","key4":"val4"},
               "user3":{"key7":"val7","key8":"val8"}
              }

Merging concept doesn't apply here. Could you please help me here ?

I've tried the solution of How to merge two Python dictionaries in a single expression? . Below solution is different from what i needed.

{'admin': {'user3': {'key8': 'val8', 'key7': 'val7'}, 'user1': {'key6': 'val6',
'key5': 'val5'}}, 'user2': {'key3': 'val3', 'key4': 'val4'}, 'user1': {'key2': '
val2', 'key1': 'val1'}}

Possible duplicate of [How can I merge two Python dictionaries in a single expression?](http://stackoverflow.com/questions/38987/how-can-i-merge-two-python-dictionaries-in-a-single-expression) — DeepSpace, Aug 09 '16 at 09:09
@DeepSpace : Can you look at recent posted output which i've tried and what exactly id needed. — User, Aug 09 '16 at 09:20
You should only regard `d2['admin']`, then you problem becomes more symmetric and natural. — Elazar, Aug 09 '16 at 09:57

score 1 · Accepted Answer · answered Aug 09 '16 at 09:36

1

You can take a copy of the first dictionary, then iterate over the other - creating a default empty dictionary, then updating it with the contents of d2, eg:

d3 = d1.copy()
for k, v in d2['admin'].iteritems():
    d3.setdefault(k, {}).update(v)

Gives you output of:

{'user1': {'key1': 'val1', 'key2': 'val2', 'key5': 'val5', 'key6': 'val6'},
 'user2': {'key3': 'val3', 'key4': 'val4'},
 'user3': {'key7': 'val7', 'key8': 'val8'}}

answered Aug 09 '16 at 09:36

Jon Clements

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Thanks for the solution. What does setdefault do here ? – User Aug 09 '16 at 09:56
1

@User See https://docs.python.org/2/library/stdtypes.html#dict.setdefault – Jon Clements Aug 09 '16 at 10:00

How to club dictionaries?

1 Answers1