How to show matplotlib plots?

In matplotlib you have two main options:

1. Create your plots and draw them at the end:

   import matplotlib.pyplot as plt
   
   plt.plot(x, y)
   plt.plot(z, t)
   plt.show()
   

2. Create your plots and draw them as soon as they are created:

   import matplotlib.pyplot as plt
   from matplotlib import interactive
   interactive(True)
   
   plt.plot(x, y)
   raw_input('press return to continue')
   
   plt.plot(z, t)
   raw_input('press return to end')