I'm doing a presentation on travel next week so I won't try to
install this until the following week, but this looks *very*
straightforward and complete.
I don't find this posted on the http://wiki.python.org/moin/MacPython
or on the FAQ, but it should be.
Thanks,
Tom
On Feb 16, 2009, at 11:07 PM, Ned Deily wrote:
In article <805e7543-96ed-474f-8059-123b4085c...@mac.com>,
Tom Bridgman <cygnu...@mac.com> wrote:
Is there a reliable way to install python 3 on a Mac without damaging
the resident installation? Are there 10.4 vs 10.5 issues?
It's easy to install multiple versions and there should be no
danger of
damage.
The python.org 3.0.1 should install on any 10.4 or 10.5 system
(actually
10.3.x as well, though I don't think that has been tested). It will
install the Python framework at /Library/Frameworks/Versions/3.0
and it
will install the folder /Applications/Python 3.0. In the latter
folder
will be IDLE, Update Shell Profile, and some Extras. By default, the
installer will *not* modify your shell profile to add python3.0 to
your
shell $PATH. You can access 3.0 by launching the 3.0 IDLE. If you
want
to use python3.0 from a shell without making it your default
python, you
can type in the full path.
/Library/Frameworks/Python.framework/Versions/3.0/bin/python3.0
Or you can create a shell alias to that path (see below).
If you do want to make python3.0 your default python, either edit your
shell profile to add the path of the framework bin directory to the
front of your PATH or click on the "Update Shell Profile" command
to do
it for you.
The python.org 2.x installers work exactly the same way, installing
into
/Library/Frameworks/Versions/2.x and /Applications/Python 2.6 (or
/Applications/MacPython 2.x for 2.5 and earlier) All versions can
co-exist with each other and with the Apple-supplied python which
lives
in /System/Library/Versions/Python.framework/2.5 for 10.5 and 2.3 for
10.4. The Apple-supplied python is also linked to from /usr/bin/
python.
(Like everything else under /System, the python files there are
managed
by Apple and should remain undisturbed.)
So, depending on which pythons you have installed, you could set up
shell aliases in your shell profile, like:
alias python3.0=\
"/Library/Frameworks/Python.framework/Versions/3.0/bin/python3.0"
alias python2.6=\
"/Library/Frameworks/Python.framework/Versions/2.6/bin/python2.6"
alias python2.5=\
"/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5"
alias applepython2.5=\
"/System/Library/Frameworks/Python.framework/Versions/2.5/bin/
python2.5"
alias macportspython2.5=\
"/opt/local/bin/python2.5"
alias finkpython2.5=\
"/sw/bin/python2.5"
...
By default, each instance of python has its own site-packages
directory,
so when installing packages, you need to pay attention to which python
you are running. If you are installing by hand, make sure you install
to the right python by doing something like:
python3.0 setup.py ...
If you want to use easy_install, you'll probably need to install
setuptools in each python version. For the python.org 2.x versions,
download from and follow the instructions here:
<http://pypi.python.org/pypi/setuptools>
The 10.5 Apple python comes with setuptools pre-installed linked at
/usr/bin/easy_install. MacPorts and Fink have setuptools
packages. You
may want to create aliases to the various easy_installs. There
isn't a
supported 3.0 version of easy_install yet but people are working on
it.
It would be nice to have a more intuitive way to manage the nest of
pythons. There will be likely be some discussion and perhaps some
work
on that at the upcoming Pycon.
I'm sure I'm missing some details here but I hope that gives you
enough
to feel comfortable exploring 3.0.
--
Ned Deily,
n...@acm.org
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