input: from Crypto.PublicKey import RSA
  
  def generate_key_pair():
      """Generate an RSA public/private key pair and save them to files.
      >>> generate_key_pair()
      # This function does not return a value but writes to 'public.pem' and 'private.pem' files.
      """
      key = RSA.generate(2048)
      pub_key = key.publickey().export_key().decode()
      with open('public.pem', 'w') as file:
          file.write(pub_key)
      
      priv_key = key.export_key().decode()
      with open('private.pem', 'w') as file:
          file.write(priv_key)
output:     pass