python dictionary plot matplotlib

Question

I got I dictionary

lr = {'0': 0.1354364, '1': 0.134567, '2': 0.100000}

and so goes on.

I try ploting a simple line graph with key(0,1,2) as the x axis and the value (0.1354364,0.134567,0.100000) as the y value

plt.plot(lr.keys(),lr.values())
plt.title('ID model model accuracy')
plt.ylabel('accuracy')
plt.xlabel('epoch')
plt.legend(['train', 'test'], loc='upper left')
plt.savefig('ID modelo: model accuracy.png')
plt.clf()

And I got this error.

TypeError: float() argument must be a string or a number, not 'dict_keys'

LucG · Accepted Answer · 2017-04-15 23:14:26Z

9

This is because the method keys() of dict objects returns a dict_keys object which is not supported by pyplot.

I would cast the dict_keys object into list to make this work:

plt.plot(list(lr.keys()),list(lr.values()))

As mentionned by @nikjohn:

It should be mentioned that this is only required for Python 3 environments. Python 2.7 and the latest matplotlib version, are perfectly okay with the code posted in the question.

edited Apr 15, 2017 at 23:14

answered Apr 15, 2017 at 21:37

LucG

1,4132 gold badges15 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

gnikit Over a year ago

@LucG - It should be mentioned that this is only required for Python 3 environments. Python 2.7 and the latest matplotlib version, are perfectly okay with the code posted in the question.

Collectives™ on Stack Overflow

python dictionary plot matplotlib

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related