By setting the same parameter multiple times with ConfigParser

I would like to read a config file with Python ConfigParser module:

[asection]
option_a = first_value
option_a = second_value

      

        
        
        
      

    

And I want to get a list of values ​​specified for option_a option. I've tried the following:

test = """[asection]
option_a = first_value
option_a = second_value
"""
import ConfigParser, StringIO
f = StringIO.StringIO(test)
parser = ConfigParser.ConfigParser()
parser.readfp(f)
print parser.items()

      

        
        
        
      

    

What are the outputs:

[('option_a', 'second_value')]

      

        
        
        
      

    

While I was hoping:

[('option_a', 'first_value'), ('option_a', 'second_value')]

      

        
        
        
      

    

Or better yet:

[('option_a', ['first_value', 'second_value'])]

      

        
        
        
      

    

Is there a way to do this using ConfigParser? Another idea?