how to make arrow that loops in matplotlib?

Question

what is the right way to draw an arrow that loops back to point to its origin in matplotlib? i tried:

plt.figure()
plt.xlim([0, 1])
plt.ylim([0, 1])
plt.annotate("", xy=(0.6, 0.9),
             xycoords="figure fraction",
             xytext = (0.6, 0.8),
             textcoords="figure fraction",
             fontsize = 10, \
             color = "k",
             arrowprops=dict(edgecolor='black',
                             connectionstyle="angle,angleA=-180,angleB=45",
                             arrowstyle = '<|-',
                             facecolor="k",
                             linewidth=1,
                             shrinkA = 0,
                             shrinkB = 0))
plt.show()

this doesn't give the right result:

the connectionstyle arguments are hard to follow from this page (http://matplotlib.org/users/annotations_guide.html).

i'm looking for is something like this or this:

update: the answer linked to does not show how do this with plt.annotate which has other features i want to use. the proposal to use $\circlearrowleft$ marker is not a real solution.

Answer 1

Try this:

import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.set_xlim(1,3) 
ax.set_ylim(1,3)
ax.plot([2.5],[2.5],marker=r'$\circlearrowleft$',ms=100)
plt.show()