Adding metadata / identifier data to a CSV file?

Question

Is there a way to add a \"tag\" (add a unique metadata/identifier) to a CSV file without affecting the contents or ability to read/write the file?

I am using Python, but

Answer 1

This would be compliant with W3C embedded metadata format: http://www.w3.org/TR/tabular-data-model/#embedded-metadata

#publisher,W3C
#updated,2015-10-17T00:00:00Z
#name,sensor,temperature
#datatype,string,float
sensor,temperature
s-1,25.5