python - Why does the Pandas documentation have a problem with this piece of code?

Question

The below is an excerpt from the Pandas documentation. What the hell is it on about? It uses the word "yikes" to describe that piece of code, yet it seems perfectly sensible to me.

We have a df. We pass it to the function. We pick our two columns of that dataframe, which we call foo We add a new column to foo, which now has 3 columns. We then return this 3-column dataframe in the last line of the code, return foo.

What the hell is wrong with that? It's perfectly legitimate! I would call this code as df = do_something(df).

question from:https://stackoverflow.com/questions/65559629/why-does-the-pandas-documentation-have-a-problem-with-this-piece-of-code

Answer 1

Waitting for answers