Trying to import plotly.express, get "TypeError: Parameters to generic types must be types. Got NotImplemented."

Dash Python
1

I’m not sure what’s causing the issue, was working fine a couple weeks ago but all of a sudden I’m getting this error now. I’ve posted the whole error message below:

TypeError                                 Traceback (most recent call last)
<ipython-input-2-fe8f9c510f1a> in <module>
      3 import pandas as pd
      4 import plotly.graph_objects as go
----> 5 import plotly.express as px

/opt/conda/lib/python3.7/site-packages/plotly/express/__init__.py in <module>
     13     )
     14 
---> 15 from ._imshow import imshow
     16 from ._chart_types import (  # noqa: F401
     17     scatter,

/opt/conda/lib/python3.7/site-packages/plotly/express/_imshow.py in <module>
      9 
     10 try:
---> 11     import xarray
     12 
     13     xarray_imported = True

/opt/conda/lib/python3.7/site-packages/xarray/__init__.py in <module>
      1 import pkg_resources
      2 
----> 3 from . import testing, tutorial, ufuncs
      4 from .backends.api import (
      5     load_dataarray,

/opt/conda/lib/python3.7/site-packages/xarray/testing.py in <module>
      6 import numpy as np
      7 
----> 8 from xarray.core import duck_array_ops, formatting, utils
      9 from xarray.core.dataarray import DataArray
     10 from xarray.core.dataset import Dataset

/opt/conda/lib/python3.7/site-packages/xarray/core/duck_array_ops.py in <module>
     14 import pandas as pd
     15 
---> 16 from . import dask_array_compat, dask_array_ops, dtypes, npcompat, nputils
     17 from .nputils import nanfirst, nanlast
     18 from .pycompat import (

/opt/conda/lib/python3.7/site-packages/xarray/core/npcompat.py in <module>
     79 # Type annotations stubs
     80 try:
---> 81     from numpy.typing import ArrayLike, DTypeLike
     82 except ImportError:
     83     # fall back for numpy < 1.20, ArrayLike adapted from numpy.typing._array_like

/opt/conda/lib/python3.7/site-packages/numpy/typing/__init__.py in <module>
    313     _VoidLike_co,
    314 )
--> 315 from ._shape import _Shape, _ShapeLike
    316 from ._dtype_like import (
    317     DTypeLike as DTypeLike,

/opt/conda/lib/python3.7/site-packages/numpy/typing/_shape.py in <module>
     13 
     14 # Anything that can be coerced to a shape tuple
---> 15 _ShapeLike = Union[SupportsIndex, Sequence[SupportsIndex]]

/opt/conda/lib/python3.7/typing.py in inner(*args, **kwds)
    249         except TypeError:
    250             pass  # All real errors (not unhashable args) are raised below.
--> 251         return func(*args, **kwds)
    252     return inner
    253 

/opt/conda/lib/python3.7/typing.py in __getitem__(self, params)
    624             params = (params,)
    625         msg = "Parameters to generic types must be types."
--> 626         params = tuple(_type_check(p, msg) for p in params)
    627         _check_generic(self, params)
    628         return _subs_tvars(self, self.__parameters__, params)

/opt/conda/lib/python3.7/typing.py in <genexpr>(.0)
    624             params = (params,)
    625         msg = "Parameters to generic types must be types."
--> 626         params = tuple(_type_check(p, msg) for p in params)
    627         _check_generic(self, params)
    628         return _subs_tvars(self, self.__parameters__, params)

/opt/conda/lib/python3.7/typing.py in _type_check(arg, msg, is_argument)
    137         return arg
    138     if not callable(arg):
--> 139         raise TypeError(f"{msg} Got {arg!r:.100}.")
    140     return arg
    141 

TypeError: Parameters to generic types must be types. Got NotImplemented.
2

Hm odd. Looks like it might be an issue that originates from numpy… Have you searched for this same error message with numpy?

3

This was the closes one, but no answer as of yet.

The rest all relate to self made functions, not to importing libraries.

4

Searching for this error message across GitHub issues:

GitHub Issues: “TypeError: Parameters to generic types must be types. Got NotImplemented.” numpy

I see this issue with xarray in numpy’s repo: numpy 1.21 generates issue with importing xarray · Issue #19310 · numpy/numpy · GitHub from 16 days ago:

A fix for the issue is currently up at #19311 and should be in the next release.

In the meantime there two possible ways of remedying the situation:

Hope that helped!