A fully generic MultiDict implementation for Python

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multicollections.MultiDict stores multiple values for the same key while preserving insertion order. Its API follows multidict, but keys can be of arbitrary hashable types.

Installation

With pip:

pip install multicollections

or conda:

conda install -c conda-forge multicollections

Usage

from multicollections import MultiDict

d = MultiDict([("a", 1), ("b", 2), ("a", 3)])

d["a"]
# 1

d.getall("a")
# [1, 3]

list(d.items())
# [("a", 1), ("b", 2), ("a", 3)]

d.add("a", 4)

The multicollections.abc module provides abstract base classes for implementing other multi-value collections.

See the documentation for the full API.