Skip Montanaro added the comment:

I should have probably pointed out that the Sniffer class is the unloved 
stepchild of the csv module. In my experience it is rarely necessary. You 
either:

* Are reading CSV files which are about what Excel would produce with its 
default settings

or

* Know just what your format is, and can define the various parameters easily

It's pretty rare, I think, to get a delimited file in some format which is 
completely unknown and which thus has to be deduced.

As Peter showed, the Sniffer class is also kind of unreliable. I didn't write 
it, and there are precious few test cases for it. One of your datasets should 
probably be added to the mix and bugs fixed.

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<http://bugs.python.org/issue24787>
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