ConfigParser 读取大写键并使它们小写 [英] ConfigParser reads capital keys and make them lower case

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.

All option names are passed through the optionxform() method. Its default implementation converts option names to lower case.

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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