Merged revisions 78384 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  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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1 files changed, 4 insertions, 0 deletions

diff --git a/Lib/csv.py b/Lib/csv.py
index 59ec372..5ae5a73 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -127,6 +127,10 @@ class DictWriter:
         self.extrasaction = extrasaction
         self.writer = writer(f, dialect, *args, **kwds)
 
+    def writeheader(self):
+        header = dict(zip(self.fieldnames, self.fieldnames))
+        self.writerow(header)
+
     def _dict_to_list(self, rowdict):
         if self.extrasaction == "raise":
             wrong_fields = [k for k in rowdict if k not in self.fieldnames]