kfisler
commented
6 months ago Code fixed and reference to future discussion of mutation modified to refer to mutable-lists section. That section does NOT close the loop here, as it doesn't come back to talk about pandas tables. It needs to -- putting that on the list for future revision.
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Which Web page has the problem?
https://dcic-world.org/2023-02-21/python-tables-Pandas.html#%28part._.Clearing_out_unknown_values%29
What's the problem?
We are told to use: events.loc[mask,'discount'] = '' rather than: events[mask]['discount'] = '' for a reason that will be explained later, but I don't think is ever explained, at least not directly to us in this chapter.
Right after we are instructed to use events.loc[mask,'discount'] = '', the example given uses the other notation, see quoted text below from the book:
Putting it all together, the entire program looks like:
codes = ['birthday', 'student'] mask = ~events['discount'].isin(codes) events[mask]['discount'] = ''
What browser are you seeing the problem on?
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