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diff --git a/docs/source/quickstart.rst b/docs/source/quickstart.rst new file mode 100644 index 0000000..0cbd45b --- /dev/null +++ b/docs/source/quickstart.rst @@ -0,0 +1,153 @@ +Quickstart +========== + +Displaying Tabular Data +----------------------- + + +The Basics +++++++++++ + +CLI Helpers provides a simple way to display your tabular data (columns/rows) in a visually-appealing manner:: + + >>> from cli_helpers import tabular_output + + >>> data = [[1, 'Asgard', True], [2, 'Camelot', False], [3, 'El Dorado', True]] + >>> headers = ['id', 'city', 'visited'] + + >>> print(tabular_output.format_output(data, headers, format_name='simple')) + + id city visited + ---- --------- --------- + 1 Asgard True + 2 Camelot False + 3 El Dorado True + +Let's take a look at what we did there. + +1. We imported the :mod:`~cli_helpers.tabular_output` module. This module gives us access to the :func:`~cli_helpers.tabular_output.format_output` function. + +2. Next we generate some data. Plus, we need a list of headers to give our data some context. + +3. We format the output using the display format ``simple``. That's a nice looking table! + + +Display Formats ++++++++++++++++ + +To display your data, :mod:`~cli_helpers.tabular_output` uses +`tabulate <https://bitbucket.org/astanin/python-tabulate>`_, +`terminaltables <https://robpol86.github.io/terminaltables/>`_, :mod:`csv`, +and its own vertical table layout. + +The best way to see the various display formats is to use the +:class:`~cli_helpers.tabular_output.TabularOutputFormatter` class. This is +what the :func:`~cli_helpers.tabular_output.format_output` function in our +first example uses behind the scenes. + +Let's get a list of all the supported format names:: + + >>> from cli_helpers.tabular_output import TabularOutputFormatter + >>> formatter = TabularOutputFormatter() + >>> formatter.supported_formats + ('vertical', 'csv', 'tsv', 'mediawiki', 'html', 'latex', 'latex_booktabs', 'textile', 'moinmoin', 'jira', 'plain', 'simple', 'grid', 'fancy_grid', 'pipe', 'orgtbl', 'psql', 'rst', 'ascii', 'double', 'github') + +You can format your data in any of those supported formats. Let's take the +same data from our first example and put it in the ``fancy_grid`` format:: + + >>> data = [[1, 'Asgard', True], [2, 'Camelot', False], [3, 'El Dorado', True]] + >>> headers = ['id', 'city', 'visited'] + >>> print(formatter.format_output(data, headers, format_name='fancy_grid')) + ╒══════╤═══════════╤═══════════╕ + │ id │ city │ visited │ + ╞══════╪═══════════╪═══════════╡ + │ 1 │ Asgard │ True │ + ├──────┼───────────┼───────────┤ + │ 2 │ Camelot │ False │ + ├──────┼───────────┼───────────┤ + │ 3 │ El Dorado │ True │ + ╘══════╧═══════════╧═══════════╛ + +That was easy! How about CLI Helper's vertical table layout? + + >>> print(formatter.format_output(data, headers, format_name='vertical')) + ***************************[ 1. row ]*************************** + id | 1 + city | Asgard + visited | True + ***************************[ 2. row ]*************************** + id | 2 + city | Camelot + visited | False + ***************************[ 3. row ]*************************** + id | 3 + city | El Dorado + visited | True + + +Default Format +++++++++++++++ + +When you create a :class:`~cli_helpers.tabular_output.TabularOutputFormatter` +object, you can specify a default formatter so you don't have to pass the +format name each time you want to format your data:: + + >>> formatter = TabularOutputFormatter(format_name='plain') + >>> print(formatter.format_output(data, headers)) + id city visited + 1 Asgard True + 2 Camelot False + 3 El Dorado True + +.. TIP:: + You can get or set the default format whenever you'd like through + :data:`TabularOutputFormatter.format_name <cli_helpers.tabular_output.TabularOutputFormatter.format_name>`. + + +Passing Options to the Formatters ++++++++++++++++++++++++++++++++++ + +Many of the formatters have settings that can be tweaked by passing +an optional argument when you format your data. For example, +if we wanted to enable or disable number parsing on any of +`tabulate's <https://bitbucket.org/astanin/python-tabulate>`_ +formats, we could:: + + >>> data = [[1, 1.5], [2, 19.605], [3, 100.0]] + >>> headers = ['id', 'rating'] + >>> print(format_output(data, headers, format_name='simple', disable_numparse=True)) + id rating + ---- -------- + 1 1.5 + 2 19.605 + 3 100.0 + >>> print(format_output(data, headers, format_name='simple', disable_numparse=False)) + id rating + ---- -------- + 1 1.5 + 2 19.605 + 3 100 + + +Lists and tuples and bytearrays. Oh my! ++++++++++++++++++++++++++++++++++++++++ + +:mod:`~cli_helpers.tabular_output` supports any :term:`iterable`, not just +a :class:`list` or :class:`tuple`. You can use a :class:`range`, +:func:`enumerate`, a :class:`str`, or even a :class:`bytearray`! Here is a +far-fetched example to prove the point:: + + >>> step = 3 + >>> data = [range(n, n + step) for n in range(0, 9, step)] + >>> headers = 'abc' + >>> print(format_output(data, headers, format_name='simple')) + a b c + --- --- --- + 0 1 2 + 3 4 5 + 6 7 8 + +Real life examples include a PyMySQL +:class:`Cursor <pymysql:pymysql.cursors.Cursor>` with +database results or +NumPy :class:`ndarray <numpy:numpy.ndarray>` with data points. |