id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
935773022,MDU6SXNzdWU5MzU3NzMwMjI=,5566,xarray fails on Travis CI,12728107,closed,0,,,4,2021-07-02T13:28:41Z,2021-07-02T19:27:59Z,2021-07-02T19:21:06Z,NONE,,,,"Hi,

I have a project build on xarray that now fails on travis. It only fails on python 3.7. Have no idea why.

Minimal sample travis.yml that still fails:

--------------------
language: python
python:
- ""3.7""

install:
  - python --version
  - pip --version
  - pip install --upgrade setuptools numpy
  - pip install xarray
  - pip list

script:
  - python -c ""import xarray""
-----------------------------

Error message (stack trace):

Traceback (most recent call last):
  File ""<string>"", line 1, in <module>
  File ""/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/xarray/__init__.py"", line 3, in <module>
    from . import testing, tutorial, ufuncs
  File ""/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/xarray/testing.py"", line 8, in <module>
    from xarray.core import duck_array_ops, formatting, utils
  File ""/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/xarray/core/duck_array_ops.py"", line 16, in <module>
    from . import dask_array_compat, dask_array_ops, dtypes, npcompat, nputils
  File ""/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/xarray/core/npcompat.py"", line 81, in <module>
    from numpy.typing import ArrayLike, DTypeLike
  File ""/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/numpy/typing/__init__.py"", line 315, in <module>
    from ._shape import _Shape, _ShapeLike
  File ""/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/numpy/typing/_shape.py"", line 15, in <module>
    _ShapeLike = Union[SupportsIndex, Sequence[SupportsIndex]]
  File ""/opt/python/3.7.1/lib/python3.7/typing.py"", line 251, in inner
    return func(*args, **kwds)
  File ""/opt/python/3.7.1/lib/python3.7/typing.py"", line 626, in __getitem__
    params = tuple(_type_check(p, msg) for p in params)
  File ""/opt/python/3.7.1/lib/python3.7/typing.py"", line 626, in <genexpr>
    params = tuple(_type_check(p, msg) for p in params)
  File ""/opt/python/3.7.1/lib/python3.7/typing.py"", line 139, in _type_check
    raise TypeError(f""{msg} Got {arg!r:.100}."")
TypeError: Parameters to generic types must be types. Got NotImplemented.
The command ""python -c ""import xarray"""" exited with 1.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/5566/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed,13221727,issue