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'

Answer 1

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.