title: What is the meaning of 1./255 as opposed to omitting the period in Python?
body: <p><a href="https://keras.io/preprocessing/image/" rel="nofollow noreferrer">https://keras.io/preprocessing/image/</a></p>
  
  <p>I'm working on image pre-processing and read the Keras documentation above. About a quarter of the way down you see the following:</p>
  
  <pre><code>train_datagen = ImageDataGenerator(
          rescale=1./255,
          shear_range=0.2,
          zoom_range=0.2,
          horizontal_flip=True)
  </code></pre>
  
  <p>Why do they have ./ instead of just a /? Thank you in advance.</p>