Python: concatenate two nested dictionaries with dictionaries as top level key values
I would like to combine two nested dictionaries
d1 = {"admin": {"key1": "v2"}}
d2 = {"admin": {"key2": "v3"},
"user": {"something": "else"}}
This should be combined with:
d = {"admin": {"key1": "v2",
"key2": "v3"},
"user": {"something": "else"}}
Is there an easy way to do this other than iterating over the first key?
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4 answers
If there is only one nesting level:
>>> d1 = {"admin": {"key1": "v2"}}
>>> d2 = {"admin": {"key2": "v3"},
... "user": {"something": "else"}}
>>> keys = list(d1) + list(d2)
>>> d = {k: dict(d1.get(k, {}).items() + d2.get(k, {}).items()) for k in keys}
>>> d
{'admin': {'key1': 'v2', 'key2': 'v3'}, 'user': {'something': 'else'}}
Deeper nesting will require recursion.
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You can use defaultdict
for each first level value like dict
. After using update()
from dict.
>>> from collections import defaultdict
>>> d = defaultdict(dict)
>>> d1 = {"admin": {"key1": "v2"}}
>>> d2 = {"admin": {"key2": "v3"},
... "user": {"something": "else"}}
>>> for dd in [d1,d2]:
... for k,v in dd.items():
... d[k].update(v)
...
>>> d
defaultdict(<type 'dict'>, {'admin': {'key2': 'v3', 'key1': 'v2'}, 'user': {'something': 'else'}})
Or in a more compact form, you can use map()
... I really don't like this, but this is a chance
>>> for dd in [d1,d2]:
... map(lambda x:d[x[0]].update(x[1]),dd.items())
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from copy import deepcopy
d1 = {"admin": {"key1": "v2"}}
d2 = {"admin": {"key2": "v3"},
"user": {"something": "else"}}
def merge(one, two):
if isinstance(two, dict):
result = deepcopy(one)
for key, value in two.iteritems():
if key in result and isinstance(result[key], dict):
result[key] = merge(result[key], value)
else:
result[key] = deepcopy(value)
return result
return two
print merge(d1, d2)
Output
{'admin': {'key2': 'v3', 'key1': 'v2'}, 'user': {'something': 'else'}}
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