Function _merge_dicts_by_key

IPython/core/guarded_eval.py:1193–1208

Merge multiple dictionaries, combining values for each key.

(dicts: list, policy: EvaluationPolicy)

def _merge_dicts_by_key(dicts: list, policy: EvaluationPolicy):
    """Merge multiple dictionaries, combining values for each key."""
    if len(dicts) == 1:
        return dicts[0]

    all_keys = set()
    for d in dicts:
        all_keys.update(d.keys())

    merged = {}
    for key in all_keys:
        values = [d[key] for d in dicts if key in d]
        if values:
            merged[key] = _merge_values(values, policy)

    return merged


def _merge_values(values, policy: EvaluationPolicy):