BUG: fixes 13822, incorrect KeyError string with non-unique columns w… #13845
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git diff upstream/master | flake8 --diff
Made changes to fix the bug related to accessing columns in a df with duplicate columns where the KeyError string was returning the wrong column.
The test that I added passed, but there seems to be a test that won't pass and I wasn't sure what's going on. Even on a clean master, when I run "nosetests pandas/tests/indexing/test_indexing.py" I get "ERROR: test_float64index_slicing_bug (pandas.tests.indexing.test_indexing.TestIndexing)".