这段代码是如何转换成python 2的？

Question

import csv

with open('scores.csv') as handle:
    reader = csv.reader(handle)
    for row in list(reader)[1:]:
        user, *scores = row
        average = sum([int(score) for score in scores]) / len(scores)
        print (
            "{user} has average of {average}".format(user=user,average=average)
        ) 

由于*分数，此代码在Python2.7中无法工作。我不知道如何将其更改为python 2.7？

这段代码取自此线程：行平均CSV Python

Answer 1

你应该使我们的代码与python 3尽可能兼容，与未来的导入：

from __future__ import division, print_function
import csv

with open('scores.csv') as handle:
    reader = csv.reader(handle)
    next(reader) # header
    for row in reader:
        user = row[0]
        scores = row[1:]
        average = sum(int(score) for score in scores) / len(scores)
        print (
        "{user} has average of {average}".format(user=user, average=average)
        ) 

Answer 2

换线

user, *scores = row

到

user, scores = row[0], row[1:]

注：除上述内容外，您还应更改

average = sum([int(score) for score in scores]) / len(scores)

到

average = sum([int(score) for score in scores]) / float(len(scores))

Python2.X中的除法是整数除法。或者，您也可以从future导入real division

from __future__ import division

要使用整数除法，请使用双正斜杠'//'