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I am executing this code which works perfectly for me:

(I only have 'positive' and 'negative' sentiments):

from sklearn import metrics
print('Accuracy:',metrics.accuracy_score(test_sentiments, predicted_sentiments))  
print('Precision:',metrics.precision_score(test_sentiments, predicted_sentiments, pos_label='positive'))

My question is: how come accuracy_score recognizes the positive label and precision_score does not?

ps: if I execute:

print('Precision:',metrics.precision_score(test_sentiments, predicted_sentiments))

or

print('Accuracy:',metrics.accuracy_score(test_sentiments, predicted_sentiments, pos_label='positive')) 

They both fail.

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Accuracy is symmetric in the naming of positive/negative classes, but precision is not: for accuracy, it doesn't matter which class is "positive." So accuracy_score doesn't have a parameter pos_label, and will error if you try to pass that parameter; meanwhile precision_score has default pos_label=1, so if your labels don't include 1 and you leave the parameter to the default, you'll get an error.

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