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Python functions to choose key conditionally from a tuple of keys.
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Here is a Python function to choose a key conditionally from a tuple

import collections

def choose_key_from_tuple(key_tuple):
    """
    Returns the key from a tuple, if the key is in the tuple, return the key,
    otherwise return None.

    :param key_tuple:
    :return:
    """
    for key in key_tuple:
        if key in key_tuple:
            return key
    return None

# Enter the tuple
key_tuple = ('a', 'b', 'c')

# Calling the function
print((choose_key_from_tuple(key_tuple)))

#Example Output
# a

#Remember to inspect code for bugs.