matplotlib axis

http://matplotlib.org/api/_as_gen/matplotlib.pyplot.axis.html#matplotlib.pyplot.axis

axis('off') #关闭坐标轴axis('equal') #changes limits of x or y axis so that equal increments of x and y have the same length; a circle is circular.axis('scaled')axis('tight')axis('image')axis('auto')axis('normal')axis('square') # 正方形