Simple matplotlib Annotating example not working in Python 2.7

Question

Code

import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)

t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = ax.plot(t, s, lw=2)

ax.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
            arrowprops=dict(facecolor='black', shrink=0.05),
            )

ax.set_ylim(-2,2)
plt.show()

from http://matplotlib.org/1.2.0/users/annotations_intro.html
return

TypeError: 'dict' object is not callable

I manged to fixed it with

xxx={'facecolor':'black', 'shrink':0.05}
ax.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
            arrowprops=xxx,
            )

Is this the best way ?
Also what caused this problem ? ( I know that this started with Python 2.7)

So if somebody know more, please share.

The code you posted works ok for me (using ipython with python v2.7.3). Perhaps you have a variable named "dict", which prevents the built-in behaviour of dict? — Bonlenfum
– Bonlenfum, Commented Jul 11, 2013 at 9:28
You are correct. I am testing some examples with ipython notebook, so dict was used previously. I had to do del dict, to make it work. You can write this as answer. — WebOrCode
– WebOrCode, Commented Jul 11, 2013 at 10:54

Community · Accepted Answer · 2017-05-23 11:58:50Z

1

Since the code looks fine and runs ok on my machine, it seems that you may have a variable named "dict" (see this answer for reference). A couple of ideas on how to check:

use Pylint.
if you suspect one specific builtin, try checking it's type (type(dict)), or look at the properties/functions it has (dir(dict)).
open a fresh notebook and try again, if you only observe the problem in interactive session.

try alternate syntax to initialise the dictionary

ax.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
    arrowprops={'facecolor':'black', 'shrink':0.05})

try explicitly instancing a variable of this type, using the alternate syntax (as you did already).

edited May 23, 2017 at 11:58

CommunityBot

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answered Jul 15, 2013 at 7:56

Bonlenfum

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