removed a pitfall where a built-in name was being shadowed

[NaelsonDouglas]

The problem
There was a scenario on the code where a Python built-in name was being shadowed.
It's a good practice to never replace built-in methods with variables, since it may lead to hard-to-detect bugs in a scenario where the name gets invoked bearing in mind its built-in purpose instead of the newly shadowed purpose.

Solution
Changed the variable name