import matplotlib.pyplot as plt
import numpy as np
n = 12
X = np.arange(n)
Y1 = (1-X/n)*np.random.uniform(0.5,1.0,n)
Y1 = (1-X/n)*np.random.uniform(0.5,1.0,n)
# 由于返回值，进过提取是str，操作小数位数不方便，外面提前处理好
p1 = plt.bar(X,np.round(Y1,2),width=0.8,facecolor='deeppink',label='uniform')
def autolabel(rects):
"""Attach a text label above each bar in *rects*, displaying its height."""
for rect in rects:
height = rect.get_height()
plt.annotate('{}'.format(height),
xy=(rect.get_x() + rect.get_width() / 2, height),
xytext=(0, 3), # 3 points vertical offset
textcoords="offset points",
ha='center', va='bottom')
# 为什么有两个hight
def add_labels(rects):
for rect in rects:
height = rect.get_height()
plt.text(rect.get_x() + rect.get_width()/2,height,height, ha='center', va='bottom')
rect.set_edgecolor('white')
# add_labels(p1)
autolabel(p1)
plt.legend(loc='best')
plt.show()
参考资料：
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