Python 相当于 Perl 的 while (<>) {...}? [英] Python equivalent of Perl's while (<>) {...}?

问题描述

我编写了许多逐行处理文件的小脚本.在 Perl 中，我使用

I write a lot of little scripts that process files on a line-by-line basis. In Perl, I use

while (<>) {
    do stuff;
}

这很方便，因为它不关心输入来自哪里(文件或标准输入).

This is handy because it doesn't care where the input comes from (a file or stdin).

在 Python 中我使用这个

In Python I use this

if len(sys.argv) == 2: # there's a command line argument
    sys.stdin = file(sys.argv[1])
for line in sys.stdin.readlines():
    do stuff

这看起来不是很优雅.是否有可以轻松处理文件/标准输入输入的 Python 习惯用法?

which doesn't seem very elegant. Is there a Python idiom that easily handles file/stdin input?

推荐答案

标准库中的fileinput模块正是你想要的:

The fileinput module in the standard library is just what you want:

import fileinput

for line in fileinput.input(): ...

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