Deepmerge: merging nested data structures¶
Deepmerge is a flexible library to handle merging of nested data structures in Python (e.g. lists, dicts).
It is available on pypi, and can be installed via pip:
pip install deepmerge
Example¶
Generic Strategy
from deepmerge import always_merger
base = {"foo": ["bar"]}
next = {"foo": ["baz"]}
expected_result = {'foo': ['bar', 'baz']}
result = always_merger.merge(base, next)
assert expected_result == result
Custom Strategy
from deepmerge import Merger
my_merger = Merger(
# pass in a list of tuple, with the
# strategies you are looking to apply
# to each type.
[
(list, ["append"]),
(dict, ["merge"]),
(set, ["union"])
],
# next, choose the fallback strategies,
# applied to all other types:
["override"],
# finally, choose the strategies in
# the case where the types conflict:
["override"]
)
base = {"foo": ["bar"]}
next = {"bar": "baz"}
my_merger.merge(base, next)
assert base == {"foo": ["bar"], "bar": "baz"}
Want to get started? see the User Guide
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