Validation in entry widget in tkinter | Python

hi, I am Tushar Sibal
This video deals with how to apply validation in a  entry box in tkinter in python by using validate and validatecommand option values ie how to validate entry/textbox in tkinter
Further in this video there is an invalidcommand option value that is being called in  case false value is being returned by the callback function ..
for more details please refer:
http://infohost.nmt.edu/tcc/help/pubs...

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