Python 2.7 Compatibility

Hey folks,

It looks like I’m unable to import altair and I think it may be related to my version of python. I’m stuck using legacy python (python 2.7), and whenever I try and import it I get the following error:

TypeError: 'ellipsis' object is not iterable

I can appreciate that I should be using python 3 but that isn’t an option here. My question is, is this error unique to my python version? and if so what version of altair should I roll back to for the time being?

altair v2.3.0 py27_1001 conda-forge

ipython trace:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-1-43bef06448fc> in <module>()
----> 1 import altair as alt

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/__init__.py in <module>()
      2 __version__ = '2.3.0'
      3
----> 4 from .vegalite import *
      5 from . import examples
      6

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/vegalite/__init__.py in <module>()
      1 # flake8: noqa
----> 2 from .v2 import *

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/vegalite/v2/__init__.py in <module>()
      1 # flake8: noqa
      2 from .schema import *
----> 3 from .api import *
      4
      5 from ...datasets import (

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/vegalite/v2/api.py in <module>()
     13 from .data import data_transformers, pipe
     14 from ... import utils, expr
---> 15 from .display import renderers, VEGALITE_VERSION, VEGAEMBED_VERSION, VEGA_VERSION
     16 from .theme import themes
     17

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/vegalite/v2/display.py in <module>()
      2
      3 from ...utils.mimebundle import spec_to_mimebundle
----> 4 from ..display import Displayable
      5 from ..display import default_renderer_base
      6 from ..display import json_renderer_base

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/vegalite/display.py in <module>()
----> 1 from ..utils.display import Displayable, default_renderer_base, json_renderer_base
      2 from ..utils.display import RendererRegistry, HTMLRenderer
      3
      4
      5 __all__ = (

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/altair/utils/display.py in <module>()
     17
     18
---> 19 class RendererRegistry(PluginRegistry[RendererType]):
     20     entrypoint_err_messages = {
     21         'notebook': textwrap.dedent(

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/typing.pyc in __getitem__(self, params)
   1040                     "Too %s parameters for %s; actual %s, expected %s" %
   1041                     ("many" if alen > elen else "few", repr(self), alen, elen))
-> 1042             tvars = _type_vars(params)
   1043             args = params
   1044         return self.__class__(self.__name__,

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/typing.pyc in _type_vars(types)
    277 def _type_vars(types):
    278     tvars = []
--> 279     _get_type_vars(types, tvars)
    280     return tuple(tvars)
    281

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/typing.pyc in _get_type_vars(types, tvars)
    272     for t in types:
    273         if isinstance(t, TypingMeta):
--> 274             t._get_type_vars(tvars)
    275
    276

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/typing.pyc in _get_type_vars(self, tvars)
    800     def _get_type_vars(self, tvars):
    801         if self.__args__:
--> 802             _get_type_vars(self.__args__, tvars)
    803
    804     def _eval_type(self, globalns, localns):

/locus/home/nazamy/test_env/miniconda3/envs/clin_ifx/lib/python2.7/site-packages/typing.pyc in _get_type_vars(types, tvars)
    270
    271 def _get_type_vars(types, tvars):
--> 272     for t in types:
    273         if isinstance(t, TypingMeta):
    274             t._get_type_vars(tvars)

TypeError: 'ellipsis' object is not iterable```

[jakevdp]

To prevent this in the future, we should require typing>=3.6 in requirements.txt.

[jakevdp]

I can reproduce the error with typing version 3.5.2 on python 2.7.15. If you upgrade the package to a newer version, I think it should fix your problem:

$ python -m pip install -U typing