How to implement key of key in python?

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Subject	How to implement key of key in python?
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I'm migrating from Perl to Python and unable to identify the equivalent of key of key concept. The following codes run well,

import csv                                                                       
                                
attr = {}                                                                        
                                                                                 
with open('test.txt','rb') as tsvin:                                           
    tsvin = csv.reader(tsvin, delimiter='\t')                                    
                                                                                 
    for row in tsvin:                                                            
        ID = row[1]                                                             


until:
        attr[ID]['adm3'] = row[2]  

I then try:
        attr[ID].adm3 = row[2]

still doesn't work. Some posts suggest using module dict but some do not. I'm a bit confused now. Any suggestions?

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How to implement key of key in python? eckhleung@gmail.com - 2014-05-09 18:22 -0700
  Re: How to implement key of key in python? CHIN Dihedral <dihedral88888@gmail.com> - 2014-05-09 19:21 -0700
  Re: How to implement key of key in python? MRAB <python@mrabarnett.plus.com> - 2014-05-10 03:30 +0100
    Re: How to implement key of key in python? eckhleung@gmail.com - 2014-05-09 20:28 -0700
      Re: How to implement key of key in python? Andrea D'Amore <anddamNOALPASTICCIODICARNE+gruppi@brapi.net> - 2014-05-10 09:07 +0200
      Re: How to implement key of key in python? Peter Otten <__peter__@web.de> - 2014-05-10 10:21 +0200

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