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How to use 'python dictionary key exist' in Python

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NicolasBizzozzero/fforest
133def _check_key_exists(d: dict, key: object, custom_exception=None) -> None:
134    """ Check if a key exists inside a dictionary. Otherwise, raise KeyError or a custom exception. """
135    try:
136        d[key]
137    except KeyError:
138        if custom_exception:
139            raise custom_exception
140        else:
141            raise KeyError
reverbrain/elliptics
38def has_key(key, keys):
39    for k in keys:
40        if k['id'] == key:
41            return True
42    return False

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