text: """Bytes to hex string.
  
  From array _a of _n bytes, build the equivalent hex string _s of _2n digits.
  Each byte (256 possible values) is encoded as two hexadecimal characters (16 possible values per digit).
  
  Source: programming-idioms.org
  """
  
  # Implementation author: Oldboy
  # Created on 2019-02-11T19:59:47.908514Z
  # Last modified on 2019-03-26T21:24:42.48353Z
  # Version 2
  
  s = a.hex()
  