CI Failing - Linux py37_np_dev - test_constructor_list_frames

[simonjayhawkins]

https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=29531&view=logs&j=3a03f79d-0b41-5610-1aa4-b4a014d0bc70&t=4d05ed0e-1ed3-5bff-dd63-1e957f2766a9

[mroeschke]

Looks like this build isn't available anymore. Happy to reopen if we continue to see this issue

[simonjayhawkins]

I'll leave this open since #32284 didn't fix the underlying issue. tests were skipped.

[simonjayhawkins]

this occured in 1.19.0rc1 (xref #34239) and tests are skipped again for 1.20.0.dev

This may become an issue shortly

cc @jbrockmendel

[TomAugspurger]

Here's the root cause

(Pdb) np.__version__
'1.18.5'
(Pdb) np.array([pd.DataFrame()])
array([], shape=(1, 0), dtype=float64)

(Pdb) np.__version__
'1.20.0.dev0+5345c25'
(Pdb) np.array([pd.DataFrame()])
array([], shape=(1, 0, 0), dtype=float64)

I think we should consider deprecating passing a list of DataFrame to the DataFrame constructor. We don't allow passing a list of 2D ndarrays, so we likely shouldn't allow passing a list of 2d DataFrames?