On 07/25/2010 09:33 PM, Edward Diener wrote: > On 7/25/2010 10:31 AM, News123 wrote: >> On 07/25/2010 02:46 PM, Edward Diener wrote: >>> On 7/25/2010 6:07 AM, Gelonida wrote:
> > How does a 'pystarter' program know where the file's location is which > is being invoked ? the file's location would be somewhere in sys.argv probably in sys.argv[1]. converting it to an abs path would return a directory which the python file belongs to. > As to the first file line this is completely > unrealistic. What are you going to do, alter the first file line of > every script in a Python distribution and every script in every library > installed in a Python distribution ? Sorry, but a less intrusive > solution is much better and much less of a headache to say the least. > Well I would at least do it for all of my self written scripts. It could allow a soft transition from 2.6 to 2.7 to 3.0 without having to upgrade all scripts at the same time. > My intended solution would be a simple program which understands where > each co-existing Python distribution is installed on a system and what > the "name" of that distribution is. Then you tell the program which > Python distribution should be the current one by its "name", the current > one meaning the distribution which you want to be invoked at any given > time. The program then changes the PATH so that any references to the > Python directory and its subdirectories point to the "name" Python > directory tree, and changes the file associations so that the "name" > Python executables handle the Python associations. > > This does have the weakness that I can not use more than one Python > distribution while Python is executing scripts. But I can personally > live with that since I have never encountered a situation where I must > use more than one Python distribution at the same time. > I guess it's rather difficult to find a solution which suits all. The above minor weakness, that you mention would be a killer for me. Currently I'm looking for solutions, where I can start python scripts requireing different python versions at the same time. Currently I'm staring the scripts manually from two different cmd line windows with a different path name and an explicit python call, Thus my idea of having a pystarter with a config file mentioning which directories (tools) should use which python executable -- http://mail.python.org/mailman/listinfo/python-list
