Updated validations.py python script.

[SanjayDevTech]

Fixed the behavior of validate_user function in validations.py.
Closes: #1
Fixes #<issue_number_goes_here>

It's a good idea to open an issue first for discussion.

• Tests pass
• Appropriate changes to README are included in PR

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[SanjayDevTech]

@googlebot I signed it!

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