使用Python删除以octothorpe开头的文件中的行吗? [英] Use Python to remove lines in a files that start with an octothorpe?

问题描述

这似乎是一个直截了当的问题，但我似乎无法指出我的问题.我正在尝试删除文件中以八丁(#)开头的所有行，但第一行除外.这是我正在使用的循环:

This seems like a straight-forward question but I can't seem to pinpoint my problem. I am trying to delete all lines in a file that start with an octothorpe (#) except the first line. Here is the loop I am working with:

for i, line in enumerate(input_file):
    if i > 1:
        if not line.startswith('#'):
            output.write(line)

上面的代码似乎无效.有谁知道我的问题是什么?谢谢！

The above code doesn't seem to work. Does anyone known what my problem is? Thanks!

推荐答案

您没有写出第一行:

for i, line in enumerate(input_file):
    if i == 0:
        output.write(line)
    else:
        if not line.startswith('#'):
            output.write(line)

还请记住，enumerate(就像大多数事物一样)从零开始.

Keep in mind also that enumerate (like most things) starts at zero.

更加简洁(不要重复输出行):

A little more concisely (and not repeating the output line):

for i, line in enumerate(input_file):
    if i == 0 or not line.startswith('#'):
        output.write(line)

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