ConfigParser 读取大写键并使它们小写

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问题描述

我发现了一个有趣的观察结果.我写了一个配置文件读取程序，

I found one interesting observation.I had written one config file read program as,

import ConfigParser
class  ConfReader(object):
    ConfMap = dict()

    def __init__(self):
        self.config = ConfigParser.ConfigParser()
        self.config.read('./Config.ini')
        self.__loadConfigMap()

    def __loadConfigMap(self):
        for sec in self.config.sections():
            for key,value in self.config.items(sec):
                print 'key = ', key, 'Value = ', value
                keyDict = str(sec) + '_' + str(key)
                print 'keyDict = ' + keyDict  
                self.ConfMap[keyDict] = value

    def getValue(self, key):
        value = ''
        try:
            print ' Key = ', key
            value = self.ConfMap[key] 
        except KeyError as KE:
            print 'Key', KE , ' didn\'t found in configuration.'
    return value

class MyConfReader(object):
    objConfReader = ConfReader()

def main():
     print MyConfReader().objConfReader.getValue('DB2.poolsize')
     print MyConfReader().objConfReader.getValue('DB_NAME')

if __name__=='__main__':
    main()

我的 Config.ini 文件看起来像，

And my Config.ini file looks like,

[DB]
HOST_NAME=localhost
NAME=temp
USER_NAME=postgres
PASSWORD=mandy

__loadConfigMap() 工作得很好.但是在读取键和值时，它使键小写.我不明白原因.谁能解释一下为什么会这样?

The __loadConfigMap() works just fine. But while reading the key and values, it is making the keys lower case. I didn't understand the reason. Can any one please explain why it is so?

推荐答案

ConfigParser.ConfigParser() 是 ConfigParser.RawConfigParser()，它被记录为以这种方式运行:

ConfigParser.ConfigParser() is a subclass of ConfigParser.RawConfigParser(), which is documented to behave this way:

所有选项名称都通过 optionxform() 方法传递.它的默认实现将选项名称转换为小写.

这是因为该模块解析 Windows INI 文件，这些文件预计不区分大小写.

That's because this module parses Windows INI files which are expected to be parsed case-insensitively.

您可以通过替换 RawConfigParser 来禁用此行为.optionxform() 函数:

You can disable this behaviour by replacing the RawConfigParser.optionxform() function:

self.config = ConfigParser.ConfigParser()
self.config.optionxform = str

str 传递选项不变.

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