How to re-scale image between 0 and 1 using PIL?

Question

There is a method in Keras called ImageDataGenerator that scales images, that would look liks this:

test_datagen = ImageDataGenerator(rescale=1./255)

I want to do the same scaling of an image, but using PIL. I have this code:

file_list = ['image1.jpg', 'image2.jpg']
for i in file_list:
  test_image = image.load_img(i,target_size=(150,150))
  images = image.img_to_array(test_image)
  images = image.img_to_array(test_image)
  images = np.expand_dims(images, axis=0)

Could someone show me how to add 'rescale the image' similar to that of ImageDataGenerator, using PIL? I can see the re-size parameter in the documentation here but not re-scale?