old_contents: import numpy as np
  from numpy.random import rand
  
  def numpy_dot():
      # Checking for bug in numpy.dot
      # https://github.com/ContinuumIO/anaconda-issues/issues/7457
  
      # If you run into this bug then try:
      #  conda install numpy nomkl
      v = rand(1000).astype(np.float64)
      assert np.isclose(np.dot(v, v), (v*v).sum())
  
      v = rand(1000).astype(np.float32)
      assert np.isclose(np.dot(v, v), (v*v).sum())
  
new_contents: import numpy as np
  from numpy.random import rand
  
  
  def numpy_dot():
      # Checking for bug in numpy.dot
      # https://github.com/ContinuumIO/anaconda-issues/issues/7457
  
      # If you run into this bug then try:
      #  conda install numpy nomkl
      v = rand(1000).astype(np.float64)
      assert np.isclose(np.dot(v, v), (v*v).sum())
  
      v = rand(1000).astype(np.float32)
      assert np.isclose(np.dot(v, v), (v*v).sum())
  
subject: Fix flake8