The goal of pandas-log is to provide feedback about basic pandas operations. It provides simple wrapper functions for the most common functions, such as .query, .apply, .merge, .group_by and more.

Pandas-log is a Python implementation of the R package tidylog, and provides a feedback about basic pandas operations.

The pandas has been invaluable for the data science ecosystem and usually consists of a series of steps that involve transforming raw data into an understandable/usable format. These series of steps need to be run in a certain sequence and if the result is unexpected it's hard to understand what happened. Pandas-log log metadata on each operation which will allow to pinpoint the issues.

Lets look at an example, first we need to load pandas-log after pandas and create a dataframe:

import pandas
import pandas_log

with pandas_log.enable():
    df = pd.DataFrame({"name": ['Alfred', 'Batman', 'Catwoman'],
                   "toy": [np.nan, 'Batmobile', 'Bullwhip'],
                   "born": [pd.NaT, pd.Timestamp("1940-04-25"), pd.NaT]})

pandas-log will give you feedback, for instance when filtering a data frame or adding a new variable:

df.assign(toy=lambda x: x.toy.map(str.lower))
  .query("name != 'Batman'")

pandas-log can be especially helpful in longer pipes:

df.assign(toy=lambda x: x.toy.map(str.lower))
  .query("name != 'Batman'")
  .dropna()\
  .assign(lower_name=lambda x: x.name.map(str.lower))
  .reset_index()

For medium article go here

For a full walkthrough go here

pandas-log is currently installable from PyPI:

pip install pandas-log

Follow contribution docs for a full description of the process of contributing to pandas-log.