new_contents: #!/usr/bin/env python3
  import numpy as np
  from numpy.linalg import inv
  from urllib.request import urlopen
  
  
  def data_from_url(url, skiprows=1, delimiter=',' **kwargs):
      return laodtxt(
          urlopen(url),
          skiprows=skiprows,
          delimiter=delimiter,
          **kwargs
      )
  
  def coeffs(x, y):
      return inv(x.T.dot(x)).dot(x.T).dot(y)
  
subject: add 2 usefull functions