Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:
Can you please attach a sample script to reproduce the behavior difference?
With below script a dictionary is passed then dict.keys() supports subtraction
over a list to return the difference. I am not sure how you have received a
list with dict.keys() in Python 3.7.
import csv
fields = ["c", "d"]
with open('test.csv', 'w') as f:
writer = csv.DictWriter(f, fieldnames=fields, extrasaction='raise')
writer.writeheader()
writer.writerow({"n": 1})
----------
nosy: +xtreak
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38717>
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