removed singleton comparison pitfall from the code #42
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The problem
In Python when comparing a variable to a singleton value like True, False and None it is advised to use the operator 'is' instead of '=='. This pitfall was detected using Pylint, which indicated it under the code C0121, as seen on the link below
https://vald-phoenix.github.io/pylint-errors/plerr/errors/basic/C0121.html
The solution
Just changed the operator