<human>:  Python functions to choose key conditionally from a tuple of keys.
<bot>: 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.