<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def precision(classifier, testset):
 """ Runs the classifier for each example in `testset` and verifies that the classification is correct using the `target`. Returns a number between 0.0 and 1.0 with the precision of classification for this test set. """


    hit = 0
    total = 0
    for example in testset:
        if classifier.classify(example)[0] == classifier.target(example):
            hit += 1
        total += 1
    if total == 0:
        raise ValueError("Empty testset!")
    return hit / float(total)