如何使用Python csv reader循环访问特定范围的行？ [英] How to loop through specific range of rows with Python csv reader?

问题描述

如何使用Python csv reader循环访问特定范围的行？

How to loop through a specific range of rows with Python csv reader?

以下代码遍历所有行：

with open(trainFile, 'rt') as csvfile:
    spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
    for row in spamreader:
        print (', '.join(row))

我希望只从给定的（i到j）循环。

I wish to loop only from given (i to j).

推荐答案

//docs.python.org/2/library/itertools.html#itertools.islicerel =nofollow> itertools.islice ：

You can use itertools.islice:

import itertools

i, j = 10, 20
with open(trainFile, 'rt') as csvfile:
    spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
    for row in itertools.islice(spamreader, i, j+1):
        print (', '.join(row))

接受一个迭代）：

注意：仅适用于CSV行不包含换行符。

NOTE: only works when CSV rows do not contain newline.

import itertools

i, j = 10, 20
with open(trainFile, 'rt') as csvfile:
    spamreader = csv.reader(itertools.islice(csvfile, i, j+1),
                            delimiter=' ', quotechar='|')
    for row in spamreader:
        print (', '.join(row))

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