Christopher J. Bottaro wrote:
I have a generator that works like this:
for row in obj.ExecSQLQuery(sql, args): # process the row
Now there are some querys that run where I know the result will only be a
single row. Is there anyway to get that single row from the generator
without having to use it in a for loop? I want to do something like this:
row = obj.ExecSQLQuery(sql, args)[0]
But I'm guessing that you can't index into a generator as if it is a list.
row = obj.ExecSQLQuery(sql, args).next()
I don't do much with SQL/databases stuff, but if you really know the result will be a single row, you can take advantage of tuple unpacking and do something like:
row, = obj.ExecSQLQuery(sql, args)
or
[row] = obj.ExecSQLQuery(sql, args)
This has the advantage that you'll get a ValueError if you happen to be wrong (and there are more or fewer values in the generator).
>>> def g(n): ... for i in range(n): ... yield i ... >>> x, = g(1) >>> x 0 >>> x, = g(2) Traceback (most recent call last): File "<interactive input>", line 1, in ? ValueError: too many values to unpack >>> x, = g(0) Traceback (most recent call last): File "<interactive input>", line 1, in ? ValueError: need more than 0 values to unpack
Steve -- http://mail.python.org/mailman/listinfo/python-list
