Question

我正在尝试使用类似于sed -i的就地值更改来更新配置文件的“值”部分。

下面的代码展示了如何使用sed

对shell进行替换

[root@server dir]# cat mystackconf.conf
>>first="one"
>>second="two"
>>third="four"

[root@server dir]# sed 's/\(^third=\).*/\1"three"/' mystackconf.conf
>>first="one"
>>second="two"
>>third="three"

我已经创建了一个非常草率的python代码来完成工作（使用sed模块调用subprocess命令）

STACK.PY

import subprocess

conf = '/var/tmp/dir/mystackconf.conf'
mydict = {"first": "one", "second": "two", "third": "three"}

for key, value in mydict.iteritems():
    subprocess.Popen(
        "/bin/sed -i 's/\(^%s=\).*/\\1\"%s\"/' %s" % (key, value, conf),
        shell=True, stdout=subprocess.PIPE).stdout.read()

使用python re模块或用通配符替换字符串是否有更简洁的方法？我对正则表达式很新，所以我不知道如何尝试。

[root@server dir]# cat mystackconf.conf 
>>first="one"
>>second="two"
>>third="four"

[root@server dir]# python stack.py

[root@server dir]# cat mystackconf.conf 
>>first="one"
>>second="two"
>>third="three"

这是一个非常糟糕的尝试，我想象它会如何完成：

STACK.PY

conf = '/var/tmp/dir/mystackconf.conf'
mydict = {"first": "one", "second": "two", "third": "three"}

with open(conf, 'a') as file:
    for key, value in mydict.iteritems():
        file.replace('[%s=].*' % key, '%s=%s' % (key, value))

Answer 1

Python有一个名为ConfigParser的内置模块可以执行此操作：https://docs.python.org/2/library/configparser.html

或者您可以使用re这样的内容：

conf = '/var/tmp/dir/mystackconf.conf'
mydict = {"first": "one", "second": "two", "third": "three"}

lines = []
with open(conf) as infile:
    for line in infile:
        for key, value in mydict.iteritems():
            line = re.sub('^{}=.*'.format(key), '{}={}'.format(key, value), line.strip())
        lines.append(line)

with open(conf, 'w') as outfile:
    for line in lines:
        print >>outfile, line

Python inplace配置值更新

1 个答案: