On 28/01/2011 16:29, Brian Curtin wrote: > On Fri, Jan 28, 2011 at 10:12, anatoly techtonik <techtonik at gmail.com > <mailto:techtonik at gmail.com>> wrote: > > Hi, I'd like to > > You probably know that after installation on Windows system it is > possible to call Python from Explorer's Run dialog (Win-R). It is > because Python path is added to App Paths registry key and Windows > Explorer shell checks this key when looking for executable. > > But Python doesn't work from cmd session and, more importantly, > *Python doesn't work from .bat files*. It is because cmd shell doesn't > know about App Paths and relies on system PATH to find executable. As > far as I remember, there is no function in Python stdlib either, that > executes processes and does lookups in App Paths. > > I never paid much attention to this fact, because I put several .bat > files for every 25, 26, 27, 31 and 32 version of Python into PATH > manually. But when bootstrap script for build environment of Native > Client (NaCl) said that I have no Python available and started to > install its own, I've asked myself - "How come? There are 5! possible > versions of Python on my system." It appeared that the following .bat > file doesn't work: > > ---cut mypy.bat-- > python.exe > ---cut mypy.bat-- > > C:\>mypy.bat > > C:\>python.exe > 'python.exe' is not recognized as an internal or external command, > operable program or batch file. > > > I've seen about 7 requests to add Python into %PATH% in installer. All > closed with no result, but with some fear and uncertainty. Martin > feared that MSI installers are not able to remove entry from PATH and > even if they can, they may kill the whole PATH instead of removing > just one entry. > > To prove or dispel these fears, I've just installed/uninstalled > Mercurial from mercurial-1.7.3-1-x86.msi and App Engine from > GoogleAppEngine-1.4.1.msi several times. Both add entries to PATH and > both remove them without any further problems. Should we finally add > this to 3.2 installer for Python? > > -- > anatoly t. > > > Definitely not for 3.2, but this is something I'd like to look into > for 3.3. > > Recently I've talked to two Python trainers/educators and the major > gripe their attendees see is that you can't just sit down and type > "python" and have something work. For multi-Python installs, we'll > have to define what that "something" is, but I think it should be > possible for the installer to optionally put Python into the path, and > to also remove itself on uninstall. > I've helped quite a few "python newbies" on Windows who are also surprised / frustrated on learning that "python" on the command line doesn't work after installing python. All the best, Michael Foord > One of said trainers is running a course inside my company right now > and the training room VMs they are running on do not have the path > setup. Some users were puzzled as to why "python foo.py" doesn't work, > but executing "foo.py" does (via file association). > > One quick-and-dirty solution was to create a "Command Shell" shortcut > in the start menu which would just be a batch file that adds Python to > the path for that cmd session. It would be kind of similar to the > "Python (command line)" shortcut, which uses pythonw.exe. I think we > can do better than this, though. > > > _______________________________________________ > Python-Dev mailing list > Python-Dev at python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: http://mail.python.org/mailman/options/python-dev/fuzzyman%40voidspace.org.uk -- http://www.voidspace.org.uk/ May you do good and not evil May you find forgiveness for yourself and forgive others May you share freely, never taking more than you give. -- the sqlite blessing http://www.sqlite.org/different.html -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20110128/44c84b95/attachment.html>
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