diff options
Diffstat (limited to 'Lib/csv.py')
| -rw-r--r-- | Lib/csv.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/csv.py b/Lib/csv.py index bfc850ee96..0de5656a4e 100644 --- a/Lib/csv.py +++ b/Lib/csv.py @@ -81,6 +81,8 @@ register_dialect("unix", unix_dialect) class DictReader: def __init__(self, f, fieldnames=None, restkey=None, restval=None, dialect="excel", *args, **kwds): + if fieldnames is not None and iter(fieldnames) is fieldnames: + fieldnames = list(fieldnames) self._fieldnames = fieldnames # list of keys for the dict self.restkey = restkey # key to catch long rows self.restval = restval # default value for short rows @@ -133,6 +135,8 @@ class DictReader: class DictWriter: def __init__(self, f, fieldnames, restval="", extrasaction="raise", dialect="excel", *args, **kwds): + if fieldnames is not None and iter(fieldnames) is fieldnames: + fieldnames = list(fieldnames) self.fieldnames = fieldnames # list of keys for the dict self.restval = restval # for writing short dicts if extrasaction.lower() not in ("raise", "ignore"): |