jsonschema.validators.SchemaError when Compound Charts

[Cecily123]

Hi, I'm using latest version of altair(4.2.0) and my python version is 3.9.5. Codes worked before now breaks with SchemaError.

Please see below codes and Stacktrace:

import altair as alt
from vega_datasets import data

source = data.cars()

brush = alt.selection(type='interval', resolve='global')

base = alt.Chart(source).mark_point().encode(
    y='Miles_per_Gallon',
    color=alt.condition(brush, 'Origin', alt.ColorValue('gray')),
).add_selection(
    brush
).properties(
    width=250,
    height=250
)

base.encode(x='Horsepower') | base.encode(x='Acceleration')

---------------------------------------------------------------------------
SchemaError                               Traceback (most recent call last)
/usr/local/lib/python3.9/site-packages/altair/vegalite/v4/api.py in TopLevelMixin.to_dict(self, *args, **kwargs)
    381 kwargs["context"] = context
    383 try:
--> 384     dct = super(TopLevelMixin, copy).to_dict(*args, **kwargs)
    385 except jsonschema.ValidationError:
    386     dct = None

/usr/local/lib/python3.9/site-packages/altair/utils/schemapi.py in SchemaBase.to_dict(self, validate, ignore, context)
    336 if validate:
    337     try:
--> 338         self.validate(result)
    339     except jsonschema.ValidationError as err:
    340         raise SchemaValidationError(self, err)

/usr/local/lib/python3.9/site-packages/altair/utils/schemapi.py in SchemaBase.validate(cls, instance, schema)
    441     schema = cls._schema
    442 resolver = jsonschema.RefResolver.from_schema(cls._rootschema or cls._schema)
--> 443 return jsonschema.validate(
    444     instance, schema, cls=cls._validator, resolver=resolver
    445 )

/usr/local/lib/python3.9/site-packages/jsonschema/validators.py in validate(instance, schema, cls, *args, **kwargs)
   1114 if cls is None:
   1115     cls = validator_for(schema)
-> 1117 cls.check_schema(schema)
   1118 validator = cls(schema, *args, **kwargs)
   1119 error = exceptions.best_match(validator.iter_errors(instance))

/usr/local/lib/python3.9/site-packages/jsonschema/validators.py in create.<locals>.Validator.check_schema(cls, schema, format_checker)
    226 validator = Validator(
    227     schema=cls.META_SCHEMA,
    228     format_checker=format_checker,
    229 )
    230 for error in validator.iter_errors(schema):
--> 231     raise exceptions.SchemaError.create_from(error)

SchemaError: '#/definitions/TopLevelNormalizedHConcatSpec<GenericSpec>' is not a 'uri-reference'

Failed validating 'format' in metaschema['properties']['$ref']:
    {'format': 'uri-reference', 'type': 'string'}

On schema['$ref']:
    '#/definitions/TopLevelNormalizedHConcatSpec<GenericSpec>'

alt.HConcatChart(...)

[binste]

Thanks for reporting the issue. The root cause is further described in #2794 and the next release of Altair will contain a fix for this (#2771). In the meantime, I suggest that you uninstall the package rfc3986-validator which should solve the issue for you:

pip uninstall rfc3986-validator

[Cecily123]

Works! Thank you!

…

On Fri, Jan 20, 2023 at 11:15 PM Stefan Binder ***@***.***> wrote: Thanks for reporting the issue. The root cause is further described in #2794 <#2794> and the next release of Altair will contain a fix for this (#2771 <#2771>). In the meantime, I suggest that you uninstall the package rfc3986-validator which should solve the issue for you: pip uninstall rfc3986-validator — Reply to this email directly, view it on GitHub <#2845 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AMZYCFVJPEYBMWO2TGKYOKLWTOEIVANCNFSM6AAAAAAUCCV5K4> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[joelostblom]

@Cecily123 There is now a release candidate of Altair 5, which supports Vega-Lite 5 and has a fix for this issue! Details and info on how to install can be found in #2937