 _csv.Error: need to escape, but no escapechar set
#### Problem description
I have comma delimited data I need to output into .csv file. 

My data looks like this:
16.0,0.118,15.0,0.5675,0.337,"LTE,eHRPD"



#### Expected Output

I need this: "LTE,eHRPD" to be output exactly as it is written here, with double quotes and a comma.

I am using QUOTE_NONE, so that I don't get the double quotes around the quoted fields and I get this error:  _csv.Error: need to escape, but no escapechar set

I am using Panda version 0.20.1

