Package: etl-toolbox
Useful ETL functions for Pythonetl-toolboxis a Python library of simple but powerful functions for ETL and
data cleaning. It contains tools that are useful for nearly any ETL pipeline,
with a specific focus on the data variety challenges that arise when compiling
data from many sources.FeaturesStandardize various null-indicating values ('blank','none','null', etc) to Python’sNoneTrim, condense, and standardize whitespace with a single functionLocate and rename column labels in messy filesQuick StartInstallationInstall fromPyPIusingpip:$ pip install etl_toolboxUsage>>> import pandas as pd
>>>
>>> df = pd.read_csv('./test_data/bad-data.csv')
>>> df  # doctest:+SKIP
         Unnamed: 0           Unnamed: 1            Unnamed: 2    Unnamed: 3 Unnamed: 4
0      created by:   Brookcub Industries  for testing purposes           NaN        NaN
1             date:           2020-06-07                3 rows  some columns        NaN
2               NaN                  NaN                   NaN           NaN        NaN
3             Cust.             EML-addr                On          phn-nmbr       col5
4     Golden jackal    c.aureus@mail.com              03/04/14      333-4444      blank
5  Pie, rufous tree                 none                   NaN      222-3333      empty
6   Vulture, bengal              blocked              06/01/15      777-7777       none
7       Arctic tern  s_paradise@mail.com              01/28/16           NaN        NaN
8   Eurasian badger  meles@othermail.net         notavailable            NaN        NaN
9   Grant's gazelle   grant@randmail.com                     -           NaN        NaNFind and standardize column labels using a dictionary of the expected values:>>> from etl_toolbox.dataframe_functions import find_column_labels
>>> from etl_toolbox.mapping_functions import map_labels
>>>
>>> fingerprint_map = {
...     'cust': 'Name',
...     'emladdr': 'Email',
...     'on': 'Date',
...     'phnnmbr': 'Phone'
... }
>>>
>>> find_column_labels(df, fingerprint_map)
>>> df
              Cust.             EML-addr         On      phn-nmbr   col5
0     Golden jackal    c.aureus@mail.com       03/04/14  333-4444  blank
1  Pie, rufous tree                 none            NaN  222-3333  empty
2   Vulture, bengal              blocked       06/01/15  777-7777   none
3       Arctic tern  s_paradise@mail.com       01/28/16       NaN    NaN
4   Eurasian badger  meles@othermail.net  notavailable        NaN    NaN
5   Grant's gazelle   grant@randmail.com              -       NaN    NaN
>>>
>>> df.columns = map_labels(df.columns, fingerprint_map)
>>> df
               Name                Email           Date     Phone      -
0     Golden jackal    c.aureus@mail.com       03/04/14  333-4444  blank
1  Pie, rufous tree                 none            NaN  222-3333  empty
2   Vulture, bengal              blocked       06/01/15  777-7777   none
3       Arctic tern  s_paradise@mail.com       01/28/16       NaN    NaN
4   Eurasian badger  meles@othermail.net  notavailable        NaN    NaN
5   Grant's gazelle   grant@randmail.com              -       NaN    NaNStandardize null values and remove empty rows/columns:>>> from etl_toolbox.dataframe_functions import dataframe_clean_null
>>>
>>> dataframe_clean_null(df)
>>> df
               Name                Email      Date     Phone
0     Golden jackal    c.aureus@mail.com  03/04/14  333-4444
1  Pie, rufous tree                  NaN       NaN  222-3333
2   Vulture, bengal                  NaN  06/01/15  777-7777
3       Arctic tern  s_paradise@mail.com  01/28/16       NaN
4   Eurasian badger  meles@othermail.net       NaN       NaN
5   Grant's gazelle   grant@randmail.com       NaN       NaNOr clean individual data values:>>> from etl_toolbox.cleaning_functions import clean_whitespace
>>>
>>> clean_whitespace(''' 123   abc 456
...                               def\t\t 789\t''')
'123 abc 456 def 789'DocumentationFull documentation is hosted atetl-toolbox.readthedocs.io.ContributingContributions are appreciated! There are multiple ways to contribute:Bug ReportsBug reports help make this library more robust. A good bug report should include:A clear description of the problem (theexpectedbehavior vs theactualbehavior)A minimal, reproducible example (seethe Stack Overflow guide)The platform and versions involved (operating system, Python version,etl-toolboxversion,pandas/numpyversion if applicable, etc)Submit bug reports with theissue trackeron GitHub.Feature RequestsOpen an issueto discuss features you’d like to see added to etl-toolbox.Pull RequestsFollow these steps for submitting pull requests:Find an issue or feature on theissue tracker.Forkthis repositoryon GitHub and make changes in a branch.Add tests to confirm that the bugfix/feature works as expected.Run the entire test suite and coverage report withpytest--doctest-modules--doctest-glob=*.rst--cov=etl_toolbox--ignore=docs/conf.py. Make sure text coverage is 100% and all tests are passing.Submit a pull request.The code style for etl-toolbox mostly followsPEP8. A linter likeFlake8is recommended for double checking new contributions.Release History0.0.3Fix multiple bugs inmerge_columns_by_label()that occurred with certain inputsChangemerge_columns_by_label()to removeNoneandnp.nanvalues from merged columnsChangefind_column_labels()to check whether the existing column labels fit the match criteria before searching rowsChangemap_labels()to return'-'instead ofNonefor unmapped labelsChangeclean_whitespace()to return non-string inputs unaltered instead of raising an exception0.0.2Add GitHub continuous integrationAdd project links and badges to readme and PyPI metadataFix bug inmerge_columns_by_label()that raises aValueErrorifdfhas multiple columns labeledNone0.0.1Initial release