你不能用pyplot.arrow绘制弯曲的箭头。但是，patches.FancyArrowPatch应该提供所有的选项来获得你想要的任何箭头样式，所以我们的想法是对直箭头也使用FancyArrowPatch，这样你就可以对所有箭头使用相同的样式。

import matplotlib.pyplot as plt
import matplotlib.patches as patches
plt.axes().set_xlim(-.5,0.5)
plt.axes().set_ylim(-0.9,0.7)
plt.axes().set_aspect(1)
style = "Simple, tail_width=0.5, head_width=4, head_length=8"
kw = dict(arrowstyle=style, color="k")
a1 = patches.FancyArrowPatch((-0.4, -0.6), (0, 0.6), **kw)
a2 = patches.FancyArrowPatch((0, 0.6), (0.4, -0.6), **kw)
a3 = patches.FancyArrowPatch((-0.4, -0.6), (0.4, -0.6),
                             connectionstyle="arc3,rad=.5", **kw)
for a in [a1, a2, a3]:
    plt.gca().add_patch(a)
plt.show()

这是我最终使用的;它有点黑客，只是在Arc的两端绘制直的arrow头：

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Arc
def circarrow(self,diameter,centX,centY,startangle,angle,**kwargs):
    startarrow=kwargs.pop("startarrow",False)
    endarrow=kwargs.pop("endarrow",False)
    arc = Arc([centX,centY],diameter,diameter,angle=startangle,
          theta1=np.rad2deg(kwargs.get("head_length",1.5*3*.001)) if startarrow else 0,theta2=angle-(np.rad2deg(kwargs.get("head_length",1.5*3*.001)) if endarrow else 0),linestyle="-",color=kwargs.get("color","black"))
    self.axes().add_patch(arc)
    if startarrow:
        startX=diameter/2*np.cos(np.radians(startangle))
        startY=diameter/2*np.sin(np.radians(startangle))
        startDX=+.000001*diameter/2*np.sin(np.radians(startangle)+kwargs.get("head_length",1.5*3*.001))
        startDY=-.000001*diameter/2*np.cos(np.radians(startangle)+kwargs.get("head_length",1.5*3*.001))
        self.arrow(startX-startDX,startY-startDY,startDX,startDY,**kwargs)
    if endarrow:
        endX=diameter/2*np.cos(np.radians(startangle+angle))
        endY=diameter/2*np.sin(np.radians(startangle+angle))
        endDX=-.000001*diameter/2*np.sin(np.radians(startangle+angle)-kwargs.get("head_length",1.5*3*.001))
        endDY=+.000001*diameter/2*np.cos(np.radians(startangle+angle)-kwargs.get("head_length",1.5*3*.001))
        self.arrow(endX-endDX,endY-endDY,endDX,endDY,**kwargs)
import types
plt.circarrow = types.MethodType(circarrow,plt)

函数名为circarrow，作为参数，您可以传递直径、中心的两个坐标、圆弧起始的Angular 和圆弧应该经过的总Angular ，以及传递给pyplot arrow的任何参数。要在圆弧的起始处绘制箭头，您可以指定startarrow=True，而endarrow=True将在弧的末端启用箭头。
下面是一个示例图像，您还可以看到箭头样式与直箭头一致：

plt.plot(0,0,"o",markersize=10,color="black",mfc="none")
plt.circarrow(.85,0,0,0.05*120,.9*120,startarrow=True,width=0,head_width=.03,head_length=.045,length_includes_head=True,color="black")
plt.circarrow(.85,0,0,1.05*120,.9*120,startarrow=True,endarrow=True,width=0,head_width=.03,head_length=.045,length_includes_head=True,color="black")
plt.arrow(-.2,-.33,.6,+.33,width=0,head_width=.03,head_length=.045,length_includes_head=True,color="black")
plt.axes().set_xlim(-.5,.5)
plt.axes().set_ylim(-.5,.5)
plt.axes().set_aspect(1)
plt.show()

example image