Using arrowstyle causes "Unknown property shrink"

[wikiped]

Using one of the examples from the gallery where in arrowprops= arrowstyle='simple' has been added:

fig = figure()
ax = fig.add_subplot(111, autoscale_on=False, xlim=(-1,5), ylim=(-3,5))

t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = ax.plot(t, s, lw=3, color='purple')

ax.annotate('offset', xy=(1, 1),  xycoords='data',
            xytext=(-15, 10), textcoords='offset points',
            arrowprops=dict(arrowstyle='simple', facecolor='black', shrink=0.05),
            horizontalalignment='right', verticalalignment='bottom')

Results in:

AttributeError: Unknown property shrink

Removing shrink attribute produces chart as expected.

[pganssle]

I am inferring from the code here that this is in annotation_demo.py, but I am unable to replicate this bug in version 1.3.0 or 1.4.2. @wikiped Is it possible you are using an old version from before "shrink" was implemented?

[wikiped]

@pganssle Sorry, I should have mentioned this, but you are right this example was extracted from annotation_demo.py. And unfortunately I still get the same error message. Just deleting shrink=x.xx "solves" the error.

And I am using latest version:

matplotlib.__version__
1.4.2

matplotlib.__version__numpy__
1.6 

Error details:

D:\Anaconda\envs\py2k\lib\site-packages\matplotlib\artist.pyc in update(self, props)
    755             func = getattr(self, 'set_' + k, None)
    756             if func is None or not six.callable(func):
--> 757                 raise AttributeError('Unknown property %s' % k)
    758             func(v)
    759             changed = True
AttributeError: Unknown property shrink

Python 2.7.9 (anaconda distribution) on Win8.1 x64 if it matters.

[tacaswell]

Ah, the problem is that if you use the simple arrow style which, it turns out, completely changes the code path that is taken. If 'arrowstyle' is in the dictionary then the arrowprops dictionary is used to create a FancyArrow patch. If arrowstyle is not in arrowprops than the dictionary is used to create a YAArrow object.

This is documented, along with the valid kwargs, in http://matplotlib.org/api/text_api.html#matplotlib.text.Annotation