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print('Could not load', errors)
The `plugin_env` should be an ``Environment`` instance that contains
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directories. The `full_env`, if supplied, should be an ``Environment``
contains all currently-available distributions. If `full_env` is not
supplied, one is created automatically from the ``WorkingSet`` this
method is called on, which will typically mean that every directory on
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`installer` is a standard installer callback as used by the
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attempt to resolve older versions of a plugin if the newest version
cannot be resolved.
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that were loadable, along with any other distributions that are needed
to resolve their dependencies. `error_info` is a dictionary mapping
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unspecified, it defaults to the current platform. `python` is an
optional string naming the desired version of Python (e.g. ``'3.3'``);
it defaults to the current version.
You may explicitly set `platform` (and/or `python`) to ``None`` if you
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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
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>>> names = 'Setuptools-1.2.3b1.egg', 'Setuptools-1.2.3.egg'
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['Setuptools-1.2.3.egg', 'Setuptools-1.2.3b1.egg']
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['Setuptools-1.2.3.post1.egg', 'Setuptools-1.2.3b1.egg']
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