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Validation and data pipelines made easy!

Project description

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Filters

The Filters library provides an easy and readable way to create complex data validation and processing pipelines, including:

  • Validating complex JSON structures in API requests or config files.
  • Parsing timestamps and converting to UTC.
  • Converting Unicode strings to NFC, normalizing line endings and removing unprintable characters.
  • Decoding Base64, including URL-safe variants.

And much more!

The output from one filter can be “piped” into the input of another, enabling you to “chain” filters together to quickly and easily create complex data pipelines.

Examples

Validate a latitude position and round to manageable precision:

(
    f.Required |
    f.Decimal |
    f.Min(Decimal(-90)) |
    f.Max(Decimal(90)) |
    f.Round(to_nearest='0.000001')
).apply('-12.0431842')

Parse an incoming value as a datetime, convert to UTC and strip tzinfo:

f.Datetime(naive=True).apply('2015-04-08T15:11:22-05:00')

Convert every value in an iterable (e.g., list) to unicode and strip leading/trailing whitespace. This also applies Unicode normalization, strips unprintable characters and normalizes line endings automatically.

f.FilterRepeater(f.Unicode | f.Strip).apply([
    b'\xe2\x99\xaa ',
    b'\xe2\x94\x8f(\xc2\xb0.\xc2\xb0)\xe2\x94\x9b ',
    b'\xe2\x94\x97(\xc2\xb0.\xc2\xb0)\xe2\x94\x93 ',
    b'\xe2\x99\xaa ',
])

Parse a JSON string and check that it has correct structure:

(
    f.JsonDecode |
    f.FilterMapper(
        {
            'birthday':  f.Date,
            'gender':    f.CaseFold | f.Choice(choices={'m', 'f', 'x'}),

            'utcOffset':
                f.Decimal |
                f.Min(Decimal('-15')) |
                f.Max(Decimal('+15')) |
                f.Round(to_nearest='0.25'),
        },

        allow_extra_keys   = False,
        allow_missing_keys = False,
    )
).apply('{"birthday":"1879-03-14", "gender":"M", "utcOffset":"1"}')

Requirements

Filters is compatible with the following Python versions:

  • 3.8
  • 3.7
  • 3.6
  • 3.5

Note

Filters is not compatible with Python 2.

Installation

Install the latest stable version via pip:

pip install phx-filters

Extensions

The following extensions are available:

  • Django Filters: Adds filters designed to work with Django applications. To install:

    pip install phx-filters[django]
    
  • ISO Filters: Adds filters for interpreting standard codes and identifiers. To install:

    pip install phx-filters[iso]
    

Tip

To install multiple extensions, separate them with commas, e.g.:

pip install phx-filters[django,iso]

Running Unit Tests

To run unit tests after installing from source:

python setup.py test

This project is also compatible with tox, which will run the unit tests in different virtual environments (one for each supported version of Python).

Install the package with the test-runner extra to set up the necessary dependencies, and then you can run the tests with the tox command:

pip install -e .[test-runner]
tox -p all

Documentation

Documentation is available on ReadTheDocs.

If you are installing from source (see above), you can also build the documentation locally:

  1. Install extra dependencies (you only have to do this once):

    pip install '.[docs-builder]'
    
  2. Switch to the docs directory:

    cd docs
    
  3. Build the documentation:

    make html
    

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