In the “Intro to Pandas” 4th document with the marvel_df project, there appears to be an error. To “modify the first_appearance of ‘Vision’ to year 1964” the answer key is given as
marvel_df.loc[‘Vision’, ‘first_appearance’] = 1964
marvel_df
But, this is not correct and can mess with the data frame. The appropriate code would be something like
marvel_df.at[‘Vision’, ‘First Appearance’] = 1964
marvel_df
I don’t know where else to report this so I’m posting it in the forum
so you mean the column name is not first_appearance but First appearance?
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No, that has nothing to do with it (I copied the code from what I was working on, and I used capital letters in my own case when I made the data frame because it personally bothered me to use lower case for the labels), the .loc function doesn’t work to change the information in a single cell, the .at (or .iat) function does
I keep not understanding what is the issue
The exercise is to change (only) the “first_appearance of ‘Vision’” to the year 1964.
The issue is the answer key sort of thing telling you how to do this is wrong, because .loc doesn’t do this. It will change the value of ‘Vision’ to 1964, but from my experience it also messes with the rest of the first_appearance values in the data frame as well. The function to change only a single value in a cell is .at or .iat
Oh, ok, it’s not about the name specifically, it’s about the other things written there! Now I get it.
Would you be willing to open an issue for it?
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