python从某些字符串值读取文件输出 [英] python read file output from certain string value

问题描述

我想从打印网卡的部分读取文本文件并从那里继续，但我不知道如何做到这一点。

I want to read the text file from the part where it prints Network Cards and continue from there, but i dont have a clue how to do this.

import os


def main():
    print "This is a file handling system"
    fileHandler()

def fileHandler():
    os.system('systeminfo>file.txt')
    foo = open('file.txt', 'r+')
    readFile = foo.read()
    x = readFile.startswith('Network Card')
    print x
    foo.close()

if __name__ == '__main__':
    main()

推荐答案

你没有需要先将子进程输出保存到文件中。您可以将其标准输出重定向到管道：

You don't need to save the subprocess output to a file first. You could redirect its stdout to a pipe:

from subprocess import check_output

after_network_card = check_output("systeminfo").partition("Network Card")[2]

after_network_card 包含第一个网卡之后的 systeminfo 的输出。

after_network_card contains output from systeminfo that comes after the first "Network Card"`.

如果您可以将输出作为文件对象访问，那么要使用网卡获取以该行开头的部分：

If you have access to the output as a file object then to get the part starting with the line with "Network Card":

from itertools import dropwhile

with open('file.txt') as file:
    lines = dropwhile(lambda line: "Network Card" not in line, file)

你也可以使用显式代表 -loop：

You could also use explicit for-loop:

for line in file:
    if "Network Card" in line:
       break
# use `file` here

文件是一个迭代器Python中的行。

A file is an iterator over lines in Python.

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