On 20/04/2013 9:07 PM, Terry Jan Reedy wrote:
On 4/20/2013 8:34 PM, Tim Chase wrote:
In 2.x, the csv.reader() class (and csv.DictReader() class) offered
a .next() method that is absent in 3.x
In Py 3, .next was renamed to .__next__ for *all* iterators. The
intention is that one iterate with for item in iterable or use builtin
functions iter() and next().
Thanks to Chris, Tim and Terry for their helpful comments.
I was seeking some code that would be acceptable to both Python 2.7 and 3.3.
In the end, I used:
inData= csv.reader(inFile)
def main():
if ver == '2':
headerLine= inData.next()
else:
headerLine= inData.__next__()
...
for item in inData:
assert len(dataStore) == len(item)
j= findCardinal(item[10])
...
This is acceptable to both versions.
It is not usual to have a name with preceding and following
udserscores,imn user code.
Presumably, there is a rationale for the change from csv.reader.next
to csv.reader.__next__.
If next is not acceptable for the version 3 csv.reader, perhaps __next__
could be added to the version 2 csv.reader, so that the same code can be
used in the two versions.
This would avoid the kluge I used above.
Colin W.
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