def readInput(inFile):
  """
    Reads in the key values.
    @ In, inFile, Python file object, file containing inputs
    @ Out, (x,y,z), tuple(float,float,float), input values
  """
  x, y, z = 0,0,0
  for line in inFile:
    var,val = line.strip().split('=')
    if   var.strip() == 'x':
      x = float(val)
    elif var.strip() == 'y':
      y = float(val)
    elif var.strip() == 'z':
      z = float(val)
  if x is None or y is None or z is None:
    raise IOError('x,y,z were not all found in input file',inFile)
  return x,y,z