python - Python 中的 "With"语句要处理多个文件

Question

我如何使用 with这种情况下的声明？

f_spam = open(spam,'r')
f_bar = open(eggs,'r')
...
do something with these files
...
f_spam.close()
f_bar.close()

文件数量可以大于两个。

Answer 1

您还可以:

from contextlib import nested

with nested(open(spam), open(eggs)) as (f_spam, f_eggs):
    # do something

在 Python 2.7 和 3.1+ 中，您不需要 nested 函数，因为 with 支持以下语法:

with open(spam) as f_spam, open(eggs) as f_eggs:
    # do something