[Tutor] 3.0 on Mac

Dave Angel davea at ieee.org
Fri Jun 12 05:54:08 CEST 2009

acfleck  wrote:

> I'm a Python nubie and having trouble with 3.0.1 on Mac (10.4.11). I 
> did a default install of MacPython 3.0.1. The IDLE.app works fine, but 
> from a Terminal window, the 'python' command still gets me V2.5.3 (the 
> original Apple installed version). A 'python3' command is not 
> recognized. I'd like to know what I need to change to access V3.0.1 
> from a Terminal window.
Use the 'which' command to see what versions of python are on your 
PATH.  Then, since you have two different versions of Python you want 
available, create one or more scripts (on your path), to explicitly run 
the other installed versions.  Probably, those scripts can be one line 
each, though you also might conceivably want to set an environment 
variable or two (such as pythonpath)

As far as I know, the install will not create a script called python3, 
or anything else like it.  That's up to you.  And it's generally not 
good form to hide the system-installed version, since many utilities and 
scripts might depend on that particular version.

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