Version 3.1.1
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这显示了误差条方法的最基本用法。在这种情况下，为X和Y方向的误差提供常量值。
import numpy as np
import matplotlib.pyplot as plt
# example data
x = np.arange(0.1, 4, 0.5)
y = np.exp(-x)
fig, ax = plt.subplots()
ax.errorbar(x, y, xerr=0.2, yerr=0.4)
plt.show()