NodeValue.expression fails on DataFrame objects

[Lehnchen]

for i, (formatted_name, label) in enumerate(zip(val.columns.format(),
                                                            val.columns)):

produces an error if used with DataFrames:

[...]bird.py", line 1045, in expression
    for i, (formatted_name, label) in enumerate(zip(val.columns.format(sparsify=False),
TypeError: format() got an unexpected keyword argument 'sparsify'

(birdeye=0.9.0, pandas: 1.2.4)

[Alex Hall]

Fixed in 0.9.1

[Alex Hall]

Thanks for the report!