Try keys in order on a dict-like object

try_keys_in_order.py

from typing import Mapping

def try_keys(obj: Mapping, *keys, default_value=None):
    """
    Tries each given key (in order) on obj (a dict-like object) and 
    returns value of first key found in object. If no key is found in object,
    then it returns default_value.

    >>> try_keys({'a': 1}, 'a', 'b', default_value=0)
    1
    >>> try_keys({'b': 3}, 'a', 'b', default_value=0)
    3
    >>> try_keys({'d': -1, 'e': 10}, 'a', 'b', default_value=0)
    0
    """
    for key in keys:
        if key in obj:
            return obj[key]
    return default_value