ENH: Adding pipe operations to pandas.api.typing.Rolling instances · Issue #57076 · pandas-dev/pandas (original) (raw)

Feature Type

• Adding new functionality to pandas
• Changing existing functionality in pandas
• Removing existing functionality in pandas

Problem Description

I wish I could use a pipe method on a rolling object for speeding up operations that require multiple vectorized (terminology?) operations on a rolling object.

Feature Description

import pandas as pd import numpy as np n_samples = 60602 # 2 hours start_ts = pd.Timestamp("2022-01-01") end_ts = start_ts + pd.Timedelta(f"{n_samples}s") s = pd.Series( np.random.normal(0, 1, size=n_samples), index=pd.date_range(start_ts, end_ts, freq="1s", inclusive="left") ).rolling("1T").pipe(lambda r: r.std()/r.mean())

Alternative Solutions

I'm not aware of any.

Additional Context

Maybe a bit silly, but I've seen recommendation to used chained operations when possible. I tend to like the style, but I haven't figured out an easy way to do this particular operation without a performance hit.

I could be misinterpreting how pipe actually works, but I think it might be equivalent to calc(r) performance wise?

Thank you for taking a look!