Check coding style with Flake8

[manuGil]

You can improve the quality of your source code by using well-stablished coding style tools like Flake8.
They will help you to keep a consistent code style in your source code. For example some of the code lines are very long:

https://github.com/rodoulak/Desalination-and-Brine-Treatment-Simulation-/blob/8dbddf58fc9bf797ff7bf93b6496e083486d0ccc/Desalsim/economic_f.py#L139

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