Re: [Qemu-devel] [PATCH v2 5/9] iotests: Different iterator behavior in Python 3

[Cleber Rosa <crosa@redhat.com>]

On 10/19/18 3:15 PM, Max Reitz wrote:
> In Python 3, several functions now return iterators instead of lists.
> This includes range(), items(), map(), and filter().  This means that if
> we really want a list, we have to wrap those instances with list().  But
> then again, the two instances where this is the case for map() and
> filter(), there are shorter expressions which work without either
> function.
> 
> On the other hand, sometimes we do just want an iterator, in which case
> we have sometimes used xrange() and iteritems() which no longer exist in
> Python 3.  Just change these calls to be range() and items(), works in
> both Python 2 and 3, and is really what we want in 3 (which is what
> matters).  But because it is so simple to do (and to find and remove
> once we completely switch to Python 3), make range() be an alias for
> xrange() in the two affected tests (044 and 163).
> 
> In one instance, we only wanted the first instance of the result of a
> filter() call.  Instead of using next(filter()) which would work only in
> Python 3, or list(filter())[0] which would work everywhere but is a bit
> weird, this instance is changed to use list comprehension with a next()
> wrapped around, which works both in 2.7 and 3.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>

Reviewed-by: Cleber Rosa <crosa@redhat.com>