How to use 'python dictionary key exist' in Python

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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
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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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