pydata/pandas — pull request #6622 by bashtage (2014-03-13 00:37:24+00:00)
Title: BUG: Error in to_stata when DataFrame contains non-string column names

to_stata does not work correctly when used with non-string names. Since
Stata requires string names, the proposed fix attempts to rename columns using
the string representation of the column name used. A warning is raised if
the column name is changed.