removed a literal caomparison pitfall from the code #139
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The problem
In Python when comparing to non-singleton values, it advised to use the operator '==' instead of 'is'.
By doing otherwise, we may fall into the a code pitfall which can be detected by pylint under the identification of R0123 literal-comparison https://vald-phoenix.github.io/pylint-errors/plerr/errors/basic/R0123.html
The solution
Refactored the comparison on literals