Is it possible to split a sequence of pandas commands across multiple lines?

Question

I have a long string of pandas chained commands, for example:

df.groupby[[\'x\',\'y\']].apply(lambda x: (np.max(x[\'z\'])-np.min(x[\'z\']))).sort_values(ascendin         


        

Answer 1

Since this has the nature of a command, I would probably format it close to your example, like this:

df.groupby[['x','y']] \
    .apply(lambda x: np.max(x['z'])-np.min(x['z'])) \
    .sort_values(ascending=False)

It took me a long time to realize I could break these expressions before the dots, which is often more readable than breaking inside the parentheses (same goes for "some long string".format()).

If this were more like an expression evaluation, I'd wrap the whole thing in parentheses, which is considered more "Pythonic" than line continuation markers:

var = (
    df.groupby[['x','y']]
        .apply(
            lambda x: np.max(x['z'])-np.min(x['z'])
        ) 
        .sort_values(ascending=False)
)