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Showing content from https://github.com/pandas-dev/pandas/issues/15488 below:

Repr-ing SparseDataFrame after setting a value · Issue #15488 · pandas-dev/pandas · GitHub

Code Sample, a copy-pastable example if possible 
>>> sdf = pd.SparseDataFrame(index=[0, 1], columns=[0, 1])
>>> sdf[0][0] = 1  # This warns; ignore
>>> sdf
AttributeError: 'NoneType' object has no attribute 'type'
Problem description

After some value is set on a copy of a SparseSeries, the enclosing SparseDataFrame can no longer be printed (raises AttributeError).

Expected Output 
>>> sdf
    0   1
0 NaN NaN
1 NaN NaN
Output of pd.show_versions()

0.19.0+479.git

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