Deprecation warning for np.ptp

Question

I'm using Python and when using the following code

df['timestamp'] = df.groupby(["id"]).timestamp.transform(np.ptp)

I'm getting the warning FutureWarning: Method .ptp is deprecated and will be removed in a future version. Use numpy.ptp instead.. df is a Pandas DataFrame and timestamp and id are columns. I think np.ptp is causing this warning.

What do I have to change?

It is something that pandas needs to adjust itself to. You can temporarily ignore the warning and wait for a fix or use something like `df.groupby('A')['B'].transform(lambda x: np.ptp(x.to_numpy()))` — ayhan, Aug 26 '19 at 18:28

Celius Stingher · Accepted Answer · 2019-08-27T16:26:42.617

1

It means that the Method .ptp is being deprecated in favor of (from what I've read) the function np.ptp() so you can either set warnings to false in order to not read it, or replace the method with the function as numpy seems to suggest.

If you wish to supress the warnings, you can try with: warnings.filterwarnings('ignore') or warnings.simplefilter('ignore', FutureWarning) if it's only FutureWarning you are ignoring.

edited Aug 27 '19 at 16:26

answered Aug 26 '19 at 18:50

Celius Stingher

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Alright, but does using np.ptp() inside transform work? That means df['timestamp'] = df.groupby(["id"]).timestamp.transform(np.ptp()) – machinery Aug 26 '19 at 19:08
It should be accepted yes, the warning is tellign that in a future it will not work and you'll have to use the function instead of the method, most probably with a lambda or apply function, with a np.ptp - transform inside it. – Celius Stingher Aug 26 '19 at 19:13
Great, thanks. By the way, how can I set the warning to false? – machinery Aug 26 '19 at 20:16
Edited in the answer :) – Celius Stingher Aug 27 '19 at 16:26

Deprecation warning for np.ptp

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