将文件中的行与字符串进行比较 [英] compare lines in a file with a string

问题描述

我正在尝试查看我的列表中是否已包含特定用户.我应该打印出找到匹配项"，但我没有.我认为问题出在我的 php 文件中，所以我创建了一个具有相同内容的文本文件，但仍然找不到匹配项.

I'm trying to see if my list already has a specific user in it. I should get "match found" printed out but I don't. I thought the problem was in my php-file so i created a text file with the same contents but it still doesn't find the match.

import urllib2
server = "10.20.68.235"
var = "patrik"
file = urllib2.urlopen("http://"+server+"/list-text.php")

for line in file:
        if line == var:
                print "match found"
        print line,

print "done"

这是我得到的输出:

someguy
user
patrik
juniper
ftpsecure
momeunier
done  

推荐答案

如果创建以下文件 xx.in:

test line 1
test line 2

并运行以下 Python 程序，您将看到正是匹配失败的原因:

and run the following Python program, you'll see exactly why the match is failing:

file = open('xx.in')
for line in file:
    print '[%s]' % (line)

输出为:

[test line 1
]
[test line 2
]

显示换行符在读入时保留在行上.如果您希望将它们剥离，可以使用:

showing that the newline characters are being left on the line when they're read in. If you want them stripped off, you can use:

line = line.rstrip('\n')

这将从字符串的 end 中删除所有换行符，并且与 strip() 不同，不会影响开头或结尾的任何其他空白字符.

This will remove all newline characters from the end of the string and, unlike strip(), will not affect any other whitespace characters at either the start or end.

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