def merge_dicts(a: Mapping[str, Any], b: Mapping[str, Any]) -> Dict[str, Any]:

Type System & Annotations

Meaning

Combines two mappings into a new dictionary, with values from the second mapping overriding those from the first for duplicate keys.

Primary Function

Merge two mappings into a new dictionary, preferring values from the second mapping when keys overlap.

Communicative Purpose

Provide a reusable utility for merging configuration dictionaries or similar mappings, allowing overrides.

Função primária

Merge two mappings into a new dictionary, preferring values from the second mapping when keys overlap.

Propósito comunicativo

Provide a reusable utility for merging configuration dictionaries or similar mappings, allowing overrides.

Situações de gatilho

When combining default settings with user overrides, merging partial results from multiple sources, or building up a cumulative result from several mappings.

Contextos

Configuration merging, API response aggregation, building cumulative results from layered data sources, constructing dictionaries from layered sources.

Família do chunk

dict-merge
mapping-merge
dict-union

Upgrade path

Consider using the dict union operator (|) introduced in Python 3.9 or the {**a, **b} unpacking syntax for more concise merging.

Tag de espaçamento: Medium-term

Examples

def merge_dicts(a: Mapping[str, Any], b: Mapping[str, Any]) -> Dict[str, Any]:\n result = dict(a)\n result.update(b)\n return result

defaults = {'timeout': 30, 'retries': 3}\nuser_opts = {'timeout': 10}\nsettings = merge_dicts(defaults, user_opts)\n# settings == {'timeout': 10, 'retries': 3}

def merge_configs(base: Mapping[str, Any], override: Mapping[str, Any]) -> Dict[str, Any]:\n return merge_dicts(base, override)