ENH: Added warning when excel file contains duplicate column names
See #10970 and #10982. Users face bugs but no informative errors are given. This should warn them and inform them what might be wrong. 

rather than a warning, should be able to handle this.  of course a tests would help
 So like automatic renaming duplicate column names?
On Sep 4, 2015 1:52 PM, "Jeff Reback" notifications@github.com wrote:

> rather than a warning, should be able to handle this. of course a tests
> would help
> 
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> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/10991#issuecomment-137805257.
 no, they should simply be handled.
