Simple Password Strength Checker Review Help needed

[Mallikarjun(ಮಲ್ಲಿಕಾರ್ಜುನ್)]

Dear friends,
 I am newbie to Python + pygtk + Glade and recently wrote a simple password
strength checker app.
Since this is my first app/program, can someone review my code (just over
150 lines) and help me improve my programming capabilities

Thank you
Mallikarjun
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