Python pkg_resources.Environment() Examples

def find_packages(self, add_to_path=True):
        """ Extends sys.path at runtime to include distributions in
        user's home directory.
        """

        logger.debug("Packages Directory: %s", self.pkgs_dir)
        distributions, errors = pkg_resources.working_set.find_plugins(
            pkg_resources.Environment([self.pkgs_dir])
        )

        if len(distributions) > 0:
            logger.debug("Found %d extension package(s).", len(distributions))

            if not add_to_path:
                return

            for it in distributions:
                pkg_resources.working_set.add(it)
                logger.debug("package added: %s", it.project_name)

            logger.error("Couldn't load: %r", errors)        # display errors
        else:
            logger.debug("No extension package found.") 

def test_marker_evaluation_with_extras_loop(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        a = Distribution.from_filename(
            "/foo_dir/a-0.2.dist-info",
            metadata=Metadata(("METADATA", "Requires-Dist: c[a]"))
        )
        b = Distribution.from_filename(
            "/foo_dir/b-0.3.dist-info",
            metadata=Metadata(("METADATA", "Requires-Dist: c[b]"))
        )
        c = Distribution.from_filename(
            "/foo_dir/c-1.0.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: a\n"
                               "Requires-Dist: b;extra=='a'\n"
                               "Provides-Extra: b\n"
                               "Requires-Dist: foo;extra=='b'"))
        )
        foo = Distribution.from_filename("/foo_dir/foo-0.1.dist-info")
        for dist in (a, b, c, foo):
            ad.add(dist)
        res = list(ws.resolve(parse_requirements("a"), ad))
        assert res == [a, c, b, foo] 

def test_marker_evaluation_with_multiple_extras(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: baz\n"
                               "Requires-Dist: quux; extra=='baz'\n"
                               "Provides-Extra: bar\n"
                               "Requires-Dist: fred; extra=='bar'\n"))
        )
        ad.add(Foo)
        quux = Distribution.from_filename("/foo_dir/quux-1.0.dist-info")
        ad.add(quux)
        fred = Distribution.from_filename("/foo_dir/fred-0.1.dist-info")
        ad.add(fred)
        res = list(ws.resolve(parse_requirements("Foo[baz,bar]"), ad))
        assert sorted(res) == [fred, quux, Foo] 

def test_marker_evaluation_with_multiple_extras(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: baz\n"
                               "Requires-Dist: quux; extra=='baz'\n"
                               "Provides-Extra: bar\n"
                               "Requires-Dist: fred; extra=='bar'\n"))
        )
        ad.add(Foo)
        quux = Distribution.from_filename("/foo_dir/quux-1.0.dist-info")
        ad.add(quux)
        fred = Distribution.from_filename("/foo_dir/fred-0.1.dist-info")
        ad.add(fred)
        res = list(ws.resolve(parse_requirements("Foo[baz,bar]"), ad))
        assert sorted(res) == [fred, quux, Foo] 

def test_marker_evaluation_with_extras_loop(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        a = Distribution.from_filename(
            "/foo_dir/a-0.2.dist-info",
            metadata=Metadata(("METADATA", "Requires-Dist: c[a]"))
        )
        b = Distribution.from_filename(
            "/foo_dir/b-0.3.dist-info",
            metadata=Metadata(("METADATA", "Requires-Dist: c[b]"))
        )
        c = Distribution.from_filename(
            "/foo_dir/c-1.0.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: a\n"
                               "Requires-Dist: b;extra=='a'\n"
                               "Provides-Extra: b\n"
                               "Requires-Dist: foo;extra=='b'"))
        )
        foo = Distribution.from_filename("/foo_dir/foo-0.1.dist-info")
        for dist in (a, b, c, foo):
            ad.add(dist)
        res = list(ws.resolve(parse_requirements("a"), ad))
        assert res == [a, c, b, foo] 

def spawn_calculation(self):
      search_path = [dist.location for dist in self.distributions]

      program = dedent("""
        import json
        import sys
        from collections import defaultdict
        from pkg_resources import Environment


        env = Environment(search_path={search_path!r})
        dependency_requirements = []
        for key in env:
          for dist in env[key]:
            dependency_requirements.extend(str(req) for req in dist.requires())
        json.dump(dependency_requirements, sys.stdout)
      """.format(search_path=search_path))

      job = spawn_python_job(
        args=['-c', program],
        stdout=subprocess.PIPE,
        interpreter=self.target.get_interpreter(),
        expose=['setuptools']
      )
      return SpawnedJob.stdout(job=job, result_func=self._markers_by_requirement) 

def _iter_requirements_requests(self, install_requests):
    if self.is_installed:
      # N.B.: Direct snip from the Environment docs:
      #
      #  You may explicitly set `platform` (and/or `python`) to ``None`` if you
      #  wish to map *all* distributions, not just those compatible with the
      #  running platform or Python version.
      #
      # Since our requested target may be foreign, we make sure find all distributions installed by
      # explicitly setting both `python` and `platform` to `None`.
      environment = Environment(search_path=[self.install_chroot], python=None, platform=None)

      distributions = []
      for dist_project_name in environment:
        distributions.extend(environment[dist_project_name])

      for install_request in install_requests:
        yield DistributionRequirements.Request(
          target=install_request.target,
          distributions=distributions
        ) 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        assert list(ws.resolve([], ad)) == []
        # Request something not in the collection -> DistributionNotFound
        with pytest.raises(pkg_resources.DistributionNotFound):
            ws.resolve(parse_requirements("Foo"), ad)

        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            assert targets == [Foo]
            list(map(ws.add,targets))
        with pytest.raises(VersionConflict):
            ws.resolve(parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([]) # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        with pytest.raises(pkg_resources.DistributionNotFound):
            ws.resolve(parse_requirements("Foo[bar]"), ad)
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        assert list(ws.resolve(parse_requirements("Foo[bar]"), ad)) ==[Foo,Baz]
        # Requests for conflicting versions produce VersionConflict
        with pytest.raises(VersionConflict) as vc:
            ws.resolve(parse_requirements("Foo==1.2\nFoo!=1.2"), ad)

        msg = 'Foo 0.9 is installed but Foo==1.2 is required'
        assert vc.value.report() == msg 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        self.assertEqual(list(ws.resolve([],ad)), [])
        # Request something not in the collection -> DistributionNotFound
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve, parse_requirements("Foo"), ad
        )
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            self.assertEqual(targets, [Foo])
            list(map(ws.add,targets))
        self.assertRaises(VersionConflict, ws.resolve,
            parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([]) # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve,parse_requirements("Foo[bar]"), ad
        )
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        self.assertEqual(
            list(ws.resolve(parse_requirements("Foo[bar]"), ad)), [Foo,Baz]
        )
        # Requests for conflicting versions produce VersionConflict
        self.assertRaises(VersionConflict,
            ws.resolve, parse_requirements("Foo==1.2\nFoo!=1.2"), ad) 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        self.assertEqual(list(ws.resolve([],ad)), [])
        # Request something not in the collection -> DistributionNotFound
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve, parse_requirements("Foo"), ad
        )
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            self.assertEqual(targets, [Foo])
            list(map(ws.add,targets))
        self.assertRaises(VersionConflict, ws.resolve,
            parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([]) # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve,parse_requirements("Foo[bar]"), ad
        )
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        self.assertEqual(
            list(ws.resolve(parse_requirements("Foo[bar]"), ad)), [Foo,Baz]
        )
        # Requests for conflicting versions produce VersionConflict
        self.assertRaises(VersionConflict,
            ws.resolve, parse_requirements("Foo==1.2\nFoo!=1.2"), ad) 

def main():

    # first, attempt to launch using nionswift-tool
    if pkg_resources.Environment()["nionswift-tool"]:
        from nion.nionswift_tool import command
        command.launch(sys.argv)
        return

    success = False

    # next attempt to launch using pyqt
    try:
        from PyQt5 import QtCore
        success = True
    except ImportError:
        pass

    # next attempt to launch using pyside2
    try:
        from PySide2 import QtCore
        success = True
    except ImportError:
        pass

    if not success:
        print("Please install either pyqt or PySide2 using pip or conda or use nionswift-tool to launch.")

    if success:
        app, error = bootstrap_main(sys.argv)

        if app:
            app.run()
        else:
            print("Error: " + error) 

def test_marker_evaluation_with_extras(self):
        """Extras are also evaluated as markers at resolution time."""
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: baz\n"
                               "Requires-Dist: quux; extra=='baz'"))
        )
        ad.add(Foo)
        assert list(ws.resolve(parse_requirements("Foo"), ad)) == [Foo]
        quux = Distribution.from_filename("/foo_dir/quux-1.0.dist-info")
        ad.add(quux)
        res = list(ws.resolve(parse_requirements("Foo[baz]"), ad))
        assert res == [Foo, quux] 

def test_environment_marker_evaluation_positive(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        Foo = Distribution.from_filename("/foo_dir/Foo-1.2.dist-info")
        ad.add(Foo)
        res = ws.resolve(parse_requirements("Foo;python_version>='2'"), ad)
        assert list(res) == [Foo] 

def test_environment_marker_evaluation_negative(self):
        """Environment markers are evaluated at resolution time."""
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        res = ws.resolve(parse_requirements("Foo;python_version<'2'"), ad)
        assert list(res) == [] 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        self.assertEqual(list(ws.resolve([],ad)), [])
        # Request something not in the collection -> DistributionNotFound
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve, parse_requirements("Foo"), ad
        )
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            self.assertEqual(targets, [Foo])
            list(map(ws.add,targets))
        self.assertRaises(VersionConflict, ws.resolve,
            parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([]) # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve,parse_requirements("Foo[bar]"), ad
        )
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        self.assertEqual(
            list(ws.resolve(parse_requirements("Foo[bar]"), ad)), [Foo,Baz]
        )
        # Requests for conflicting versions produce VersionConflict
        self.assertRaises(VersionConflict,
            ws.resolve, parse_requirements("Foo==1.2\nFoo!=1.2"), ad) 

def test_marker_evaluation_with_extras(self):
        """Extras are also evaluated as markers at resolution time."""
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: baz\n"
                               "Requires-Dist: quux; extra=='baz'"))
        )
        ad.add(Foo)
        assert list(ws.resolve(parse_requirements("Foo"), ad)) == [Foo]
        quux = Distribution.from_filename("/foo_dir/quux-1.0.dist-info")
        ad.add(quux)
        res = list(ws.resolve(parse_requirements("Foo[baz]"), ad))
        assert res == [Foo, quux] 

def test_environment_marker_evaluation_positive(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        Foo = Distribution.from_filename("/foo_dir/Foo-1.2.dist-info")
        ad.add(Foo)
        res = ws.resolve(parse_requirements("Foo;python_version>='2'"), ad)
        assert list(res) == [Foo] 

def test_environment_marker_evaluation_negative(self):
        """Environment markers are evaluated at resolution time."""
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        res = ws.resolve(parse_requirements("Foo;python_version<'2'"), ad)
        assert list(res) == [] 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        self.assertEqual(list(ws.resolve([],ad)), [])
        # Request something not in the collection -> DistributionNotFound
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve, parse_requirements("Foo"), ad
        )
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            self.assertEqual(targets, [Foo])
            list(map(ws.add,targets))
        self.assertRaises(VersionConflict, ws.resolve,
            parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([]) # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        self.assertRaises(
            pkg_resources.DistributionNotFound, ws.resolve,parse_requirements("Foo[bar]"), ad
        )
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        self.assertEqual(
            list(ws.resolve(parse_requirements("Foo[bar]"), ad)), [Foo,Baz]
        )
        # Requests for conflicting versions produce VersionConflict
        self.assertRaises(VersionConflict,
            ws.resolve, parse_requirements("Foo==1.2\nFoo!=1.2"), ad) 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        self.assertEqual(list(ad), [])
        self.assertEqual(ad['FooPkg'],[])
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        self.assertTrue(ad['FooPkg'])
        # But only 1 package
        self.assertEqual(list(ad), ['foopkg'])

        # Distributions sort by version
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.3-1','1.2']
        )
        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.2']
        )
        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.9','1.4','1.2']
        )

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        self.assertEqual(ad.best_match(req,ws).version, '1.9')
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4')

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        self.assertRaises(VersionConflict, ad.best_match, req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4') 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        assert list(ad) == []
        assert ad['FooPkg'] == []
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        assert ad['FooPkg']
        # But only 1 package
        assert list(ad) == ['foopkg']

        # Distributions sort by version
        expected = ['1.4', '1.3-1', '1.2']
        assert [dist.version for dist in ad['FooPkg']] == expected

        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        assert [dist.version for dist in ad['FooPkg']] == ['1.4', '1.2']

        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        assert [dist.version for dist in ad['FooPkg']] == ['1.9', '1.4', '1.2']

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        assert ad.best_match(req, ws).version == '1.9'
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4'

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        with pytest.raises(VersionConflict):
            ad.best_match(req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4' 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        assert list(ws.resolve([], ad)) == []
        # Request something not in the collection -> DistributionNotFound
        with pytest.raises(pkg_resources.DistributionNotFound):
            ws.resolve(parse_requirements("Foo"), ad)

        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            assert targets == [Foo]
            list(map(ws.add, targets))
        with pytest.raises(VersionConflict):
            ws.resolve(parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([])  # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        with pytest.raises(pkg_resources.DistributionNotFound):
            ws.resolve(parse_requirements("Foo[bar]"), ad)
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        assert (
            list(ws.resolve(parse_requirements("Foo[bar]"), ad))
            == [Foo, Baz]
        )
        # Requests for conflicting versions produce VersionConflict
        with pytest.raises(VersionConflict) as vc:
            ws.resolve(parse_requirements("Foo==1.2\nFoo!=1.2"), ad)

        msg = 'Foo 0.9 is installed but Foo==1.2 is required'
        assert vc.value.report() == msg 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        assert list(ad) == []
        assert ad['FooPkg'] == []
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        assert ad['FooPkg']
        # But only 1 package
        assert list(ad) == ['foopkg']

        # Distributions sort by version
        assert [dist.version for dist in ad['FooPkg']] == ['1.4','1.3-1','1.2']

        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        assert [dist.version for dist in ad['FooPkg']] == ['1.4','1.2']

        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        assert [dist.version for dist in ad['FooPkg']] == ['1.9','1.4','1.2']

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        assert ad.best_match(req, ws).version == '1.9'
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4'

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        with pytest.raises(VersionConflict):
            ad.best_match(req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4' 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        self.assertEqual(list(ad), [])
        self.assertEqual(ad['FooPkg'],[])
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        self.assertTrue(ad['FooPkg'])
        # But only 1 package
        self.assertEqual(list(ad), ['foopkg'])

        # Distributions sort by version
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.3-1','1.2']
        )
        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.2']
        )
        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.9','1.4','1.2']
        )

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        self.assertEqual(ad.best_match(req,ws).version, '1.9')
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4')

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        self.assertRaises(VersionConflict, ad.best_match, req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4') 

def testResolve(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Resolving no requirements -> nothing to install
        assert list(ws.resolve([], ad)) == []
        # Request something not in the collection -> DistributionNotFound
        with pytest.raises(pkg_resources.DistributionNotFound):
            ws.resolve(parse_requirements("Foo"), ad)

        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.egg",
            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
        )
        ad.add(Foo)
        ad.add(Distribution.from_filename("Foo-0.9.egg"))

        # Request thing(s) that are available -> list to activate
        for i in range(3):
            targets = list(ws.resolve(parse_requirements("Foo"), ad))
            assert targets == [Foo]
            list(map(ws.add, targets))
        with pytest.raises(VersionConflict):
            ws.resolve(parse_requirements("Foo==0.9"), ad)
        ws = WorkingSet([])  # reset

        # Request an extra that causes an unresolved dependency for "Baz"
        with pytest.raises(pkg_resources.DistributionNotFound):
            ws.resolve(parse_requirements("Foo[bar]"), ad)
        Baz = Distribution.from_filename(
            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
        )
        ad.add(Baz)

        # Activation list now includes resolved dependency
        assert (
            list(ws.resolve(parse_requirements("Foo[bar]"), ad))
            == [Foo, Baz]
        )
        # Requests for conflicting versions produce VersionConflict
        with pytest.raises(VersionConflict) as vc:
            ws.resolve(parse_requirements("Foo==1.2\nFoo!=1.2"), ad)

        msg = 'Foo 0.9 is installed but Foo==1.2 is required'
        assert vc.value.report() == msg 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        self.assertEqual(list(ad), [])
        self.assertEqual(ad['FooPkg'],[])
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        self.assertTrue(ad['FooPkg'])
        # But only 1 package
        self.assertEqual(list(ad), ['foopkg'])

        # Distributions sort by version
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.3-1','1.2']
        )
        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.2']
        )
        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.9','1.4','1.2']
        )

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        self.assertEqual(ad.best_match(req,ws).version, '1.9')
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4')

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        self.assertRaises(VersionConflict, ad.best_match, req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4') 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        assert list(ad) == []
        assert ad['FooPkg'] == []
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        assert ad['FooPkg']
        # But only 1 package
        assert list(ad) == ['foopkg']

        # Distributions sort by version
        expected = ['1.4', '1.3-1', '1.2']
        assert [dist.version for dist in ad['FooPkg']] == expected

        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        assert [dist.version for dist in ad['FooPkg']] == ['1.4', '1.2']

        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        assert [dist.version for dist in ad['FooPkg']] == ['1.9', '1.4', '1.2']

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        assert ad.best_match(req, ws).version == '1.9'
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4'

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        with pytest.raises(VersionConflict):
            ad.best_match(req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4' 

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        self.assertEqual(list(ad), [])
        self.assertEqual(ad['FooPkg'],[])
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        self.assertTrue(ad['FooPkg'])
        # But only 1 package
        self.assertEqual(list(ad), ['foopkg'])

        # Distributions sort by version
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.3-1','1.2']
        )
        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.4','1.2']
        )
        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        self.assertEqual(
            [dist.version for dist in ad['FooPkg']], ['1.9','1.4','1.2']
        )

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        self.assertEqual(ad.best_match(req,ws).version, '1.9')
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4')

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        self.assertRaises(VersionConflict, ad.best_match, req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        self.assertEqual(ad.best_match(req,ws).version, '1.4')