Untitled

import math

def ChartoNibbledHex(a):
  x,y=[],[]
  for i in a:
    x.append(ord(i)) # convert string character to ascii value
  for i in x:
    nib1 = zfl(str(int(bin(i)[2:])),8)[:4]
    nib2 = zfl(str(int(bin(i)[2:])),8)[4:]
    y.append (hex(int(nib1+'0000')))
    y.append (hex(int(nib2+'0000')))

  return y


def zfl(s, width):
  return '{:0>{w}}'.format(s, w=width)


print(ChartoNibbledHex("Hello world"))