[ python-Feature Requests-1634717 ] csv.DictWriter: Include offending name in error message

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Feature Requests item #1634717, was opened at 2007-01-13 11:53
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Gabriel Genellina (gagenellina)
Assigned to: Nobody/Anonymous (nobody)
Summary: csv.DictWriter: Include offending name in error message

Initial Comment:
In csv.py, class DictWriter, method _dict_to_list, when rowdict contains a key that is not a known field name, a ValueError is raised, but no reference to the offending name is given.
As the code iterates along the dict keys, and stops at the first unknown one, its trivial to include such information.
Replace lines:

    if k not in self.fieldnames:
        raise ValueError, "dict contains fields not in fieldnames"

with:

    if k not in self.fieldnames:
        raise ValueError, "dict contains field not in fieldnames: %r" % k


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1634717&group_id=5470