code: def bob_private_key(p):
      """Bob determine his private key
      in the range of 1 ~ p-1.
      This must be kept in secret"""
      return randint(1, p - 1)
  
file_path: keon-algos/algorithms/maths/diffie_hellman_key_exchange.py
imports: import math
  from random import randint
label_desc: Use image node_id 7 for calling a global function with example usage: bob_private_key(p) and returns: randint