ValueError: columns cannot be a set

[eg271]

Looks like Pandas new version (1.5.2) doesn't allow sets for columns so several locations in the code need to be adapted somehow:

            if len(data) == 0:
                data = pd.DataFrame(columns=self.colname_unique(cols))
                return data

[eg271]

Update: This is already handled in latest commits - just need to bump release version

[bug-or-feature]

0.0.19 released today includes the fix