New submission from Pavel:
At the very beginning the csv module documentation
(https://docs.python.org/3.7/library/csv.html) advises to open files passing
newline='' parameter though three examples don't include it:
Here are the examples:
1:
>>> import csv
>>> with open('names.csv') as csvfile:
... reader = csv.DictReader(csvfile)
... for row in reader:
... print(row['first_name'], row['last_name'])
...
Eric Idle
John Cleese
>>> print(row)
OrderedDict([('first_name', 'John'), ('last_name', 'Cleese')])
2:
import csv
with open('names.csv', 'w') as csvfile:
fieldnames = ['first_name', 'last_name']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow({'first_name': 'Baked', 'last_name': 'Beans'})
writer.writerow({'first_name': 'Lovely', 'last_name': 'Spam'})
writer.writerow({'first_name': 'Wonderful', 'last_name': 'Spam'})
3:
with open('example.csv') as csvfile:
dialect = csv.Sniffer().sniff(csvfile.read(1024))
csvfile.seek(0)
reader = csv.reader(csvfile, dialect)
# ... process CSV file contents here ...
----------
assignee: docs@python
components: Documentation
messages: 298397
nosy: Pavel, docs@python
priority: normal
severity: normal
status: open
title: csv module examples miss newline='' when opening files
versions: Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue30937>
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