matplotlib ax.annotate color of the arrow
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
ax.annotate('test', xy=(0.9, 0.9),
xycoords='data',
xytext=(0, 0),
textcoords='data',
arrowprops=dict(arrowstyle= '<|-|>',
color='blue',
lw=3.5,
ls='--')
)
ax.set_xlim(-0.1,1)
ax.set_ylim(-0.1,1)
fig.show()