这非常简单.绘制标签后，您可以简单地更改旋转角度:

It is very simple. After plotting the label, you can simply change the rotation:

from matplotlib import pyplot as plt
plt.ion()
plt.plot([1,2,3])
h = plt.ylabel('y')
h.set_rotation(0)
plt.draw()

或者，您可以将旋转值作为参数传递，即

Alternatively, you can pass the rotation as an argument, i.e

plt.ylabel('y',rotation=0)