diff options
| -rw-r--r-- | Lib/csv.py | 7 | ||||
| -rw-r--r-- | Misc/NEWS | 4 |
2 files changed, 8 insertions, 3 deletions
@@ -115,9 +115,10 @@ class DictWriter: def _dict_to_list(self, rowdict): if self.extrasaction == "raise": - for k in rowdict.keys(): - if k not in self.fieldnames: - raise ValueError, "dict contains fields not in fieldnames" + wrong_fields = [k for k in rowdict if k not in self.fieldnames] + if wrong_fields: + raise ValueError("dict contains fields not in fieldnames: " + + ", ".join(wrong_fields)) return [rowdict.get(key, self.restval) for key in self.fieldnames] def writerow(self, rowdict): @@ -168,6 +168,10 @@ Core and builtins Library ------- +- Patch #1635454: the csv.DictWriter class now includes the offending + field names in its exception message if you try to write a record with + a dictionary containing fields not in the CSV field names list. + - Patch #1668100: urllib2 now correctly raises URLError instead of OSError if accessing a local file via the file:// protocol fails. |