Why do we need calculations in Tableau? They help when the source does not contain the data necessary for visualization, but it can be obtained using calculations.
Python is more versatile in data processing and calculations but worse for visualization. So there are several tasks for which it makes sense to do pre-processing in Python and then visualize in a Tableau.
Tableau is also limited in table calculations. For one of the projects, we had to eventually calculate the ranks between the columns in Python, clinging it to the Prep. Besides, many advanced types of analysis in the scoreboard are not possible, for example, log-linear.
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