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N)r@rrZr)rr%rrrrrr$s  zEnvironment.scancCs|}|j|gS)aReturn a newest-to-oldest list of distributions for `project_name` Uses case-insensitive `project_name` comparison, assuming all the project's distributions use their project's name converted to all lowercase as their key. )lowerr"r)rrZdistribution_keyrrr __getitem__szEnvironment.__getitem__cCsL||rH|rH|j|jg}||vrH|||jtddddS)zLAdd `dist` if we ``can_add()`` it and it has not already been added hashcmpTr1reverseN) r' has_versionr"rr1rroperator attrgetter)rrrrrrrs  zEnvironment.addFcCsdz||}Wnty*|s"d}Yn0|dur8|S||jD]}||vrB|SqB|||S)aFind distribution best matching `req` and usable on `working_set` This calls the ``find(req)`` method of the `working_set` to see if a suitable distribution is already active. (This may raise ``VersionConflict`` if an unsuitable version of the project is already active in the specified `working_set`.) If a suitable distribution isn't active, this method returns the newest distribution in the environment that meets the ``Requirement`` in `req`. If no suitable distribution is found, and `installer` is supplied, then the result of calling the environment's ``obtain(req, installer)`` method will be returned. N)rrer1obtain)rrrXrrrrrrr s   zEnvironment.best_matchcCs|dur||SdS)aObtain a distribution matching `requirement` (e.g. via download) Obtain a distro that matches requirement (e.g. via download). In the base ``Environment`` class, this routine just returns ``installer(requirement)``, unless `installer` is None, in which case None is returned instead. 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