dict8 0.0.2

features

• No boilerplate: just a, b, path and some code.

• Enables you to define a specific merge behavior for every part of the tree.

• Merge into datclasses or attrs.

internal

The default machinery converts all input data to a Mapper. If a and b are mappable, the new, common and old values are taken to a custom function to decide upon the value precedence. Returning missing will omit this key from the intermediate result. The chosen mapper will decide how to incorporate the latter.

example

import dict8


@dict8.ion
def merge(a, b, path, /, **kv):
    try:
        # try descent into sub mappings
        return merge(
            a,
            b,
            path,
            **kv,
        )
    except dict8.UnMappable:
        # take b else a
        return b if b is not dict8.missing else a


assert (
    merge(
        {
            1: 2,
            3: {4: 5},
        },
        {
            3: {4: 2, 5: 1},
        },
    )
    == {1: 2, 3: {4: 2, 5: 1}}
)