semvec/pypi-packages huggingface dataset:
pandasql-lts 0.7.3
sqldf for pandas
License: MIT

pandasql-lts
============

This repository aims to maintain `original
pandasql <https://github.com/yhat/pandasql>`__. All credit goes to
`yhat <https://github.com/yhat>`__.

``pandasql`` allows you to query ``pandas`` DataFrames using SQL syntax.
It works similarly to ``sqldf`` in R. ``pandasql`` seeks to provide a
more familiar way of manipulating and cleaning data for people new to
Python or ``pandas``.

Installation
^^^^^^^^^^^^

::

   $ pip install -U pandasql-lts

Basics
^^^^^^

The main function used in pandasql is ``sqldf``. ``sqldf`` accepts 2
parametrs - a sql query string - a set of session/environment variables
(``locals()`` or ``globals()``)

Specifying ``locals()`` or ``globals()`` can get tedious. You can define
a short helper function to fix this.

::

   from pandasql import sqldf
   pysqldf = lambda q: sqldf(q, globals())

Querying
^^^^^^^^

``pandasql`` uses `SQLite syntax <http://www.sqlite.org/lang.html>`__.
Any ``pandas`` dataframes will be automatically detected by
``pandasql``. You can query them as you would any regular SQL table.

::

   $ python
   >>> from pandasql import sqldf, load_meat, load_births
   >>> pysqldf = lambda q: sqldf(q, globals())
   >>> meat = load_meat()
   >>> births = load_births()
   >>> print pysqldf("SELECT * FROM meat LIMIT 10;").head()
                     date  beef  veal  pork  lamb_and_mutton broilers other_chicken turkey
   0  1944-01-01 00:00:00   751    85  1280               89     None          None   None
   1  1944-02-01 00:00:00   713    77  1169               72     None          None   None
   2  1944-03-01 00:00:00   741    90  1128               75     None          None   None
   3  1944-04-01 00:00:00   650    89   978               66     None          None   None
   4  1944-05-01 00:00:00   681   106  1029               78     None          None   None

joins and aggregations are also supported

::

   >>> q = """SELECT
           m.date, m.beef, b.births
        FROM
           meats m
        INNER JOIN
           births b
              ON m.date = b.date;"""
   >>> joined = pyqldf(q)
   >>> print joined.head()
                       date    beef  births
   403  2012-07-01 00:00:00  2200.8  368450
   404  2012-08-01 00:00:00  2367.5  359554
   405  2012-09-01 00:00:00  2016.0  361922
   406  2012-10-01 00:00:00  2343.7  347625
   407  2012-11-01 00:00:00  2206.6  320195

   >>> q = "select
              strftime('%Y', date) as year
              , SUM(beef) as beef_total
              FROM
                 meat
              GROUP BY
                 year;"
   >>> print pysqldf(q).head()
      year  beef_total
   0  1944        8801
   1  1945        9936
   2  1946        9010
   3  1947       10096
   4  1948        8766

More information and code samples available in the
`examples <./examples/>`__ folder or on `yhat’s
blog <http://blog.yhathq.com/posts/pandasql-sql-for-pandas-dataframes.html>`__.

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