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  r78384 | dirkjan.ochtman | 2010-02-23 16:09:52 -0500 (Tue, 23 Feb 2010) | 4 lines

  Fix #1537721: add writeheader() method to csv.DictWriter.

  Reviewed by skip.montanaro and thomas.wouters.
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This commit is contained in:
R. David Murray 2010-02-23 22:57:58 +00:00
parent 5117b0b0dc
commit be0698b1ad
4 changed files with 20 additions and 0 deletions
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4
Lib/test/test_csv.py
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@ -535,8 +535,12 @@ class TestDictFields(unittest.TestCase):
def test_write_simple_dict(self):
with TemporaryFile("w+", newline='') as fileobj:
writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"])
writer.writeheader()
fileobj.seek(0)
self.assertEqual(fileobj.readline(), "f1,f2,f3\r\n")
writer.writerow({"f1": 10, "f3": "abc"})
fileobj.seek(0)
fileobj.readline() # header
self.assertEqual(fileobj.read(), "10,,abc\r\n")
def test_write_no_fields(self):