docs: def avg(vals, count=None):
      """ Returns the average value
  
      Args:
          vals: List of numbers to calculate average from.
          count: Int of total count that vals was part of.
  
      Returns:
          Float average value throughout a count.
      """ 
      sum = 0
      for v in vals:
          sum += v
      if count is None:
          count = len(vals)
      return float(sum) / count