removed a singleton-comparison pitfall - #244
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The problem
In Python when comparing to singletons, the use of the operator 'is' instead of '==' is encouraged.
This pitfall was detected using Pylint, under the code C0121
More about it can be found here: https://vald-phoenix.github.io/pylint-errors/plerr/errors/basic/C0121.html
Solution
Replaced '==' to 'is' when comparing to singletons