[python] added f-string to python-package/lightgbm/basic.py

[NovusEdge]

No description provided.

[NovusEdge]

#4136

[jameslamb]

I merged in the latest changes from the master branch to this PR tonight, following the steps described in #4144 (review).

I also patched a few small things in b52f56c

@StrikerRUS I think this is now ready for review.

[jameslamb]

These changes look good to me, but since I added a few changes I don't think my approval should count towards a merge.

[StrikerRUS]

Please update

LightGBM/python-package/lightgbm/basic.py

Lines 537 to 539 in 8937022

	raise ValueError("DataFrame.dtypes for data must be int, float or bool.\n"
	"Did not expect the data types in the following fields: "
	+ ', '.join(data.columns[bad_indices]))

LightGBM/python-package/lightgbm/basic.py

Line 2426 in 8937022

tree_num = str(tree_index) + '-' if tree_index is not None else ''

LightGBM/python-package/lightgbm/basic.py

Line 2431 in 8937022

return tree_num + node_type + node_num

[jameslamb]

Please update

updated in a2cfecb and merged in latest master

[StrikerRUS]

Thanks! Just few suggestions.

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