In matplotlib 1.4.0 the following code:

fig=plt.figure()
ax=fig.add_subplot(111)
plt.plot([0,1],[0,1])
ax.annotate("Example Arrow", xy=(0.5, 0.5),
            xytext=(0.3, 0.6), arrowprops=dict(arrowstyle="->"))

raises many DeprecationWarning of the form:

.../python2.7/site-packages/matplotlib/bezier.py:298: DeprecationWarning: using a non-integer number instead of an integer will result in an error in the future
path_out = Path(concat([verts_right, path.vertices[i:]]),

Presumably this is due to the recent changes to Annotation, switching from xytext to xyann. There doesn't seem to be any way for the user to avoid this when drawing an arrow annotation.

Thanks!