AttributeError: module 'jsonschema' has no attribute 'Draft7Validator' - altair

Question

Please help. I have no idea how to fix this :(
import altair as alt causes the following
<ipython-input-4-8ce2321ae70f> in <module>()
1 import pandas as pd
----> 2 import altair as alt
~\altair\__init__.py in <module>()
2 __version__ = "4.2.0.dev0"
3
----> 4 from .vegalite import *
5 from . import examples
6
~\altair\vegalite\__init__.py in <module>()
1 # flake8: noqa
----> 2 from .v4 import *
~\altair\vegalite\v4\__init__.py in <module>()
1 # flake8: noqa
----> 2 from .schema import *
3 from .api import *
4
5 from ...datasets import list_datasets, load_dataset
~\altair\vegalite\v4\schema\__init__.py in <module>()
1 # flake8: noqa
----> 2 from .core import *
3 from .channels import *
4 SCHEMA_VERSION = 'v4.17.0'
5 SCHEMA_URL = 'https://vega.github.io/schema/vega-lite/v4.17.0.json'
~\altair\vegalite\v4\schema\core.py in <module>()
2 # tools/generate_schema_wrapper.py. Do not modify directly.
3
----> 4 from altair.utils.schemapi import SchemaBase, Undefined, _subclasses
5
6 import pkgutil
~\altair\utils\__init__.py in <module>()
----> 1 from .core import (
2 infer_vegalite_type,
3 infer_encoding_types,
4 sanitize_dataframe,
5 parse_shorthand,
~\altair\utils\core.py in <module>()
15 import numpy as np
16
---> 17 from .schemapi import SchemaBase, Undefined
18
19 try:
~\altair\utils\schemapi.py in <module>()
141
142
--> 143 class SchemaBase(object):
144 """Base class for schema wrappers.
145
~\altair\utils\schemapi.py in SchemaBase()
151 _rootschema = None
152 _class_is_valid_at_instantiation = True
--> 153 _validator = jsonschema.Draft7Validator
154
155 def __init__(self, *args, **kwds):
AttributeError: module 'jsonschema' has no attribute 'Draft7Validator'```

Answer 1

It looks like your version of jsonschema is too old. Altair requires jsonschema newer than version 3.0 and older than version 4.0 (see the requirements file)
You can fix this by running, e.g.
pip install jsonschema==3.2