filters 1.2.3

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"}')

Extensions

The following extensions are available:

• ISO Filters: Adds filters for interpreting standard codes and identifiers. To install:

  pip install filters[iso]