将 spearmanr 结果四舍五入到小数点后 3 位

Question

如果我想将 spearmanr 结果作为注释放在我的绘图上，如何将其四舍五入到小数点后 3 位？

import matplotlib.pyplot as plt
import scipy.stats
import numpy as np

percent = np.array([34.72,47.22,40.97,43.06,57.64,50.00,69.44])
year = np.array([2009,2010,2011,2012,2013,2014,2015])

fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(year,percent, marker='o')
ax.set_ylim(20,80)
ax.set_xticks(year)

ax.annotate(scipy.stats.spearmanr(year,percent), xy=(2009,70))

plt.show()

Output 我希望注释保留在图表内。

Answer 1

重新格式化注释中的文本。将倒数第二行替换为：

r = scipy.stats.spearmanr(year, percent)
text = "correlation: {:.3f}, pvalue:{:.3f}".format(r.correlation, r.pvalue)
ax.annotate(text, xy=(2009,70))

输出