Bug report

Bug description:

I'd like to output all quotes verbatim, without any escaping/quoting, but this fails:

import csv
w = csv.writer(open('test.tsv', 'w'), delimiter = '\t', quoting = csv.QUOTE_NONE)
w.writerow(('"hello"', '"world"'))
# _csv.Error: need to escape, but no escapechar set

When I set escapechar='' or quotechar='', it also fails:

import csv
w = csv.writer(open('test.tsv', 'w'), delimiter = '\t', quoting = csv.QUOTE_NONE, escapechar = '')
w.writerow(('"hello"', '"world"'))
# TypeError: "escapechar" must be a 1-character string
import csv
w = csv.writer(open('test.tsv', 'w'), delimiter = '\t', quoting = csv.QUOTE_NONE, quotechar = '')
w.writerow(('"hello"', '"world"'))
# TypeError: "quotechar" must be a 1-character string

I would suggest that under QUOTE_NONE, escaping of quotes should not be performed at all, or at least allow empty escapechar / quotechar

The workaround / hack I found:

import csv
w = csv.writer(open('test.tsv', 'w'), delimiter = '\t', quoting = csv.QUOTE_NONE, quotechar = '\t')
w.writerow(('"hello"', '"world"'))

Bug report

Bug description:

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