(a_pr_k, a, p)
return pow(a, a_pr_k) % p
Alice calculate her public key
    with her private key.
    This is open to public
Alice calculate her public key
    with her private key.
    This is open to public
Alice calculate her public key with her private key . This is open to public
def alice_public_key(a_pr_k, a, p):
    """Alice calculate her public key
    with her private key.
    This is open to public"""
    return pow(a, a_pr_k) % p
def alice_public_key ( a_pr_k , a , p ) : return pow ( a , a_pr_k ) % p