Why does this code raise csv.Error?
csv, python
Solution
Setting `quoting=csv.QUOTE_NONE` is not enough; you also need to set `quotechar` to an empty string:
>>> import sys
>>> import csv
>>> writer = csv.writer(sys.stdout, delimiter="|", quoting=csv.QUOTE_NONE, quotechar='')
>>> writer.writerow(['"foo', "bar"])
"foo|bar
Otherwise, `csv.writer()` will try to escape any existing `quotechar` characters, but it needs `csv.escapechar` to be set for that.
Problem
I'm trying to write out CSV using Python's built-in csv module. ``` import csv import sys writer = csv.writer(sys.stdout, delimiter="|", quoting=csv.QUOTE_NONE) writer.writerow(['"foo', "bar"]) ``` The output I expect is: ``` "foo|bar ``` However, I get this: ``` Error: need to escape, but no escapechar set ``` The documentation says: When the current delimiter occurs in output data it is preceded by the current escapechar character. If escapechar is not set, the writer will raise Error if any characters that require escaping are encountered. Now, the delimiter ('|', the pipe character) doesn't appear anywhere in the data. Why is the CSV writer trying to escape something?