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[QUOTE="Roy Smith, post: 5122337"]
It's a chicken-and-egg thing.  People aren't moving because the
libraries they depend on don't yet support P3, so there's not a lot of
people using P3, so there's not a lot of pressure for libraries to
support it, etc.

Here's our list of external Python dependencies (mostly installed with
pip, a few of the harder to build ones we install as binaries with
apt-get).  I'll annotate them with what P3 support is available.  I'm
doing this quickly, so may not be 100% accurate (and I ran out of time,
so I started just looking at the major ones):

argparse==1.2.1           # included in P3
beanstalkc==0.3.0         # no support
blinker==1.2              # P3 supported
boto==2.5.1               # no support
dateglob==0.1             # no support, probably not critical
decorator==3.3.3          # P3 supported
django==1.4.5             # P3 support in 1.6 (RC just released)
django-multi-sessions==0.1.0    # no support, probably not critical
django-timedeltafield==0.7.0    # no support, probably not critical
dnspython==1.11.0         # P3 supported
elasticsearch==0.4.2      # no support (unclear)
Fabric==1.7.0             # "eventual Python 3.x compatibility"
gevent==0.13.8            # no support
grequests==0.2.0          # no support
gunicorn==0.17.4          # P3 supported
jellyfish==0.2.0          # no support
Jinja2==2.7.1             # "upcoming" support for P3
leveldb==0.19             # no support
lxml==2.2.4               # P3 supported
markdown==2.3.1
MarkupSafe==0.18
mongoengine==0.7.10       # P3 support on the roadmap for 0.9 release
mrjob==0.4
msgpack-python==0.3.0
nose==1.3.0
numpy==1.6.1     # "some [...] packages still only work on Python 2"
pandas==0.9.1
paramiko==1.11.0
Paste==1.7.2
PIL==1.1.7
prettytable==0.7
psycopg2==2.5
pyasn1==0.1.7
pymongo==2.5.2           # P3 supported
pyparsing==1.5.2
pysnmp==4.2.3
python-cjson==1.0.5
python-dateutil==1.4.1
python-memcached==1.53
pytz==2010b
pyzmq==13.1.0
requests==1.2.0           # P3 supported
rpclib==2.7.0-beta
scipy==0.9.0
setproctitle==1.1.6
statsd==2.0.3
suds==0.4
tornado==3.1
ujson==1.23
Unidecode==0.04.5
unittest2==0.5.1

I would agree.  I think the handwriting is on the wall that we'll get
there eventually, but it's taking a lot longer than I would have
expected.

I think we're at the point where most major projects either already
support P3, or at least have it on their roadmaps, and people learning
Python in school are starting to be taught P3 instead of P2.  But I
think we're not going to see P3 be the predominant version for several
more years.
[/QUOTE]

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