code: def variance(x, avgx=None):
      """
      Args:
        x: iterable with len
  
      Returns:
        A list with the variance for each element of x
      """
      if avgx is None:
          avgx = average(x)
      return [pow(y - avgx, 2.0) for y in x]
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import math
label_desc: Use image node_id 2 for calling a global function with example usage: variance(x, avgx) and returns: unknown