It's a very simple task to perform, just use figure and it will tell you the call signature:
from matplotlib.pyplot import figure
figure(num=None, figsize=(3, 4), dpi=80, facecolor='k', edgecolor='w')
(1,1,) in figsize will create a inch-by-inch plot and it'll be of 80-by-80 (defined in dpi) pixels.
