Assertion Error in columns in DataFrame with hierarchical indexing Assertion Error in columns in DataFrame with hierarchical indexing pandas pandas

Assertion Error in columns in DataFrame with hierarchical indexing


I pushed a fix for this yesterday. Here's the new behavior on github master:

In [1]: pastefrom pandas import DataFramef = DataFrame({'a': ['1','2','3'], 'b': ['2','3','4']})f.columns = [['level1 item1', 'level1 item2'],['', 'level2 item2'], ['level3 item1', 'level3 item2']]f## -- End pasted text --Out[1]:   level1 item1 level1 item2               level2 item2  level3 item1 level3 item20            1            21            2            32            3            4In [2]: f['level1 item1']Out[2]:   level3 item10            11            22            3