[Python] ConfigParser reads capital keys and make them lower case

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()


And my Config.ini file looks like,

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


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?

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