Copy for test set

[newmahone07]

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My Code:

        train = df[df["fold"] != fold]
        test = df[df["fold"] == fold].copy()

Why the test set use copy() function but train does not?

[info.victoromondi]

Hello @newmahone07,
I’ve not done that mission, but I think they’ve used .copy() to avoid SettingWithCopyWarning
Check here:

Equals (=) vs shallow copy vs deep copy in Pandas Dataframes

[adam-niescioruk-e7dVRT4tL9A-unsplash] In this article, I’m going to show you 3 ways of copying Dataframes in Pandas, explain how they are all different and tell you when you should use either. Equals (df1 = df) When we assign a DataFrame to a new variable using =, we are not creating a new copy of the DataFrame. We are merely adding a new name to call the same object. The below example will help you to understand it better. Notice that the id of both df and df1 objects are the same. So wheth…