Python 2.7 更改另一个python文件中的全局变量

我计划通过导入另一个python文件来修改该文件中的全局变量。新文件似乎修改了全局变量。但是，当通过调用原始类中的函数来访问全局变量时，它仍然不会被修改。我怎样才能做到这一点？例如，

base_file.py

定义如下：

CONFIG_DICT = {'Name1': 'Value1'}

def print_config():
   for name, val in CONFIG_DICT.iteritems():
      print 'Inside print_config - Name:%s and Value:%s' % (name, val)

import base_file as bf

def update_config():
   for name, val in bf.CONFIG_DICT.iteritems():
      print 'Before modification inside update_config - Name:%s and Value:%s' % (name, val)
   bf.CONFIG_DICT = {}
   bf.CONFIG_DICT['Name2'] = 'Value2'
   for name, val in bf.CONFIG_DICT.iteritems():
      print 'After modification inside update_config - Name:%s and Value:%s' % (name, val)

if __name__ == "__main__":
   bf.print_config()
   update_config()
   bf.print_config()

new_file.py

定义如下：

CONFIG_DICT = {'Name1': 'Value1'}

def print_config():
   for name, val in CONFIG_DICT.iteritems():
      print 'Inside print_config - Name:%s and Value:%s' % (name, val)

import base_file as bf

def update_config():
   for name, val in bf.CONFIG_DICT.iteritems():
      print 'Before modification inside update_config - Name:%s and Value:%s' % (name, val)
   bf.CONFIG_DICT = {}
   bf.CONFIG_DICT['Name2'] = 'Value2'
   for name, val in bf.CONFIG_DICT.iteritems():
      print 'After modification inside update_config - Name:%s and Value:%s' % (name, val)

if __name__ == "__main__":
   bf.print_config()
   update_config()
   bf.print_config()

运行

new_file.py

的输出如下：

Inside print_config - Name:Name1 and Value:Value1
Before modification inside update_config - Name:Name1 and Value:Value1
After modification inside update_config - Name:Name2 and Value:Value2
###########################################################
# How Can I change this so that this yields Name2, Value2?#
###########################################################
Inside print_config - Name:Name1 and Value:Value1