Split values for columns in CSV file using Python

Question

import urllib
import csv

@manager.command
def list_routes():
    for rule in app.url_map.iter_rules():
        options = {}

    for arg in rule.arguments:
        options[arg] = "[{0}]".format(arg)

    url = rule.rule
    line = urllib.parse.unquote("{}{} ".format(rule.endpoint, url))

    with open('urls.cvs', 'a') as out:
        spamwriter = csv.writer(out, lineterminator='', dialect='excel')
        spamwriter.writerows(line)
        spamwriter.writerows('\n')

I need to fill in the csv file so that rule.endpoint and url have separate columns.

Answer 1

Your writerows parameter just needs to be a list of lists of the values the row should contain. So for example writer.writerows([[1, 2], [3, 4]]) will add two rows where each row contains two values. As you add only one row you can use writerow :

spamwriter.writerow([rule.endpoint, url])

Here is a mock-up. I'm using BytesIO so that I don't need to actually write to a file:

import csv
import io
c = io.BytesIO()
w = csv.writer(c, lineterminator="", dialect="excel")
w.writerow(['endpoint', 'url'])
print(c.getvalue())  # prints: endpoint,url

Answer 2

import csv
@manager.command
def list_routes():
    with open('urls.csv', 'w') as out:
        csv_writer = csv.writer(out, lineterminator='\n')
        csv_writer.writerows([[rule.endpoint, rule.rule] for rule in app.url_map.iter_rules()])