Power Query is less friendly with typeless (or rather untyped) columns. In fact, I only started to bother about data types when starting to use Power Query, Power BI and Power Pivot (data modelling tool in Excel). We just enter values and it's all fine (somehow). It's true that in spreadsheet applications like Excel, data type is not really of a bother to the user, as there is no functionality to define the type of the data present in cells. Dictionaries: Dictionaries in Python can store multiple objects, but unlike lists, in dictionaries, the objects are stored by keys and not by positions.For a beginner in Power BI and in business intelligence in general, it is not easy to understand data types and differentiate them from data format.Sets: Sets in Python are a data type that can be considered as an unordered collection of data without any duplicate items.They are basically a list that cannot be changed.
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