On 21 June 2012 12:48, Chris McDonough <chr...@plope.com> wrote:
> On 06/21/2012 04:45 AM, Nick Coghlan wrote:>>> On Thu, Jun 21, 2012 at 2:44 PM, Chris McDonough<chr...@plope.com>>> wrote:>>>>> All of these are really pretty minor issues compared with the main>>> benefit>>> of not needing to ship everything with everything else. The killer>>> feature>>> is that developers can specify dependencies and users can have those>>> dependencies installed automatically in a cross-platform way. Everything>>> else is complete noise if this use case is not served.>>>>>>> Cool. This is the kind of thing we need recorded in a PEP - there's a>> lot of domain knowledge floating around in the heads of packaging>> folks that needs to be captured so we can know *what the addition of>> packaging to the standard library is intended to fix*.>>>> And, like it or not, setuptools has a serious PR problem due to the>> fact it monkeypatches the standard library, uses *.pth files to alter>> sys.path for every installed application by default, actually *uses*>> the ability to run code in *.pth files and has hard to follow>> documentation to boot. I *don't* trust that I fully understand the>> import system on any machine with setuptools installed, because it is>> demonstrably happy to install state to the file system that will>> affect *all* Python programs running on the machine.>>>> I don't know about Red Hat but both Ubuntu and Apple put all kinds of> stuff on the default sys.path of the system Python of the box that's> related to their software's concerns only. I don't understand why people> accept this but get crazy about the fact that installing a setuptools> distribution using easy_install changes the default sys.path.>
I don't like the particular way that easy_install modifies sys.path so that
it can no longer be overridden by PYTHONPATH. For a discussion, see:
http://stackoverflow.com/questions/5984523/eggs-in-path-before-pythonpath-environment-variable
The fact that ubuntu does this for some system ubuntu packages has never
bothered me, but the fact that it happens for packages that I install with
easy_install has. The typical scenario would be that I:
1) Install some package X with easy_install.
2) Find a bug or some aspect of X that I want to change and checkout the
latest version from e.g. github.
3) Try to use PYTHONPATH to test the checked out version and find that
easy_install's path modification prevents me from doing so.
4) Run the quickfix script in the stackoverflow question above and consider
not using easy_install for X in future.
Oscar
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