matplotlib.pyplot基础（二），柱面图，散点图，坐标系填充
（1）柱面图plt.bar# 柱面图plt.barimport numpy as npimport matplotlib.pyplot as pltplt.figure()n = 8X = np.arange(n)+1#X是1,2,3,4,5,6,7,8,柱的个数# numpy.random.uniform(low=0.0, high=1.0, size=None), normal#
