diff --git a/poetry/core/__init__.py b/poetry/core/__init__.py
index 6d03f4671..91077e15e 100644
--- a/poetry/core/__init__.py
+++ b/poetry/core/__init__.py
@@ -1 +1,15 @@
+import sys
+
+
+try:
+    from pathlib import Path
+except ImportError:
+    # noinspection PyUnresolvedReferences
+    from pathlib2 import Path
+
 __version__ = "1.0.0a5"
+
+__vendor_site__ = (Path(__file__).parent / "_vendor").as_posix()
+
+if __vendor_site__ not in sys.path:
+    sys.path.insert(0, __vendor_site__)
diff --git a/poetry/core/_vendor/__init__.py b/poetry/core/_vendor/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/poetry/core/_vendor/jsonschema/LICENSE b/poetry/core/_vendor/jsonschema/LICENSE
new file mode 100644
index 000000000..c28adbadd
--- /dev/null
+++ b/poetry/core/_vendor/jsonschema/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2012 Julian Berman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/poetry/core/_vendor/jsonschema/__init__.py b/poetry/core/_vendor/jsonschema/__init__.py
index b21b281dc..1791fe7fb 100644
--- a/poetry/core/_vendor/jsonschema/__init__.py
+++ b/poetry/core/_vendor/jsonschema/__init__.py
@@ -8,18 +8,18 @@
 instance under a schema, and will create a validator for you.
 """
 
-from poetry.core._vendor.jsonschema.exceptions import (
+from jsonschema.exceptions import (
     ErrorTree, FormatError, RefResolutionError, SchemaError, ValidationError
 )
-from poetry.core._vendor.jsonschema._format import (
+from jsonschema._format import (
     FormatChecker,
     draft3_format_checker,
     draft4_format_checker,
     draft6_format_checker,
     draft7_format_checker,
 )
-from poetry.core._vendor.jsonschema._types import TypeChecker
-from poetry.core._vendor.jsonschema.validators import (
+from jsonschema._types import TypeChecker
+from jsonschema.validators import (
     Draft3Validator,
     Draft4Validator,
     Draft6Validator,
diff --git a/poetry/core/_vendor/jsonschema/__main__.py b/poetry/core/_vendor/jsonschema/__main__.py
index 2d1a68a73..82c29fd39 100644
--- a/poetry/core/_vendor/jsonschema/__main__.py
+++ b/poetry/core/_vendor/jsonschema/__main__.py
@@ -1,2 +1,2 @@
-from poetry.core._vendor.jsonschema.cli import main
+from jsonschema.cli import main
 main()
diff --git a/poetry/core/_vendor/jsonschema/_format.py b/poetry/core/_vendor/jsonschema/_format.py
index 7c7617c77..281a7cfcf 100644
--- a/poetry/core/_vendor/jsonschema/_format.py
+++ b/poetry/core/_vendor/jsonschema/_format.py
@@ -3,8 +3,8 @@
 import socket
 import struct
 
-from poetry.core._vendor.jsonschema.compat import str_types
-from poetry.core._vendor.jsonschema.exceptions import FormatError
+from jsonschema.compat import str_types
+from jsonschema.exceptions import FormatError
 
 
 class FormatChecker(object):
diff --git a/poetry/core/_vendor/jsonschema/_legacy_validators.py b/poetry/core/_vendor/jsonschema/_legacy_validators.py
index 3b49c35f8..264ff7d71 100644
--- a/poetry/core/_vendor/jsonschema/_legacy_validators.py
+++ b/poetry/core/_vendor/jsonschema/_legacy_validators.py
@@ -1,6 +1,6 @@
-from poetry.core._vendor.jsonschema import _utils
-from poetry.core._vendor.jsonschema.compat import iteritems
-from poetry.core._vendor.jsonschema.exceptions import ValidationError
+from jsonschema import _utils
+from jsonschema.compat import iteritems
+from jsonschema.exceptions import ValidationError
 
 
 def dependencies_draft3(validator, dependencies, instance, schema):
diff --git a/poetry/core/_vendor/jsonschema/_reflect.py b/poetry/core/_vendor/jsonschema/_reflect.py
index 63f672d3d..d09e38fbd 100644
--- a/poetry/core/_vendor/jsonschema/_reflect.py
+++ b/poetry/core/_vendor/jsonschema/_reflect.py
@@ -9,7 +9,7 @@
 
 import sys
 
-from poetry.core._vendor.jsonschema.compat import PY3
+from jsonschema.compat import PY3
 
 
 class _NoModuleFound(Exception):
diff --git a/poetry/core/_vendor/jsonschema/_types.py b/poetry/core/_vendor/jsonschema/_types.py
index d2211d2d5..a71a4e34b 100644
--- a/poetry/core/_vendor/jsonschema/_types.py
+++ b/poetry/core/_vendor/jsonschema/_types.py
@@ -1,10 +1,10 @@
 import numbers
 
-from poetry.core._vendor.pyrsistent import pmap
-from poetry.core._vendor import attr
+from pyrsistent import pmap
+import attr
 
-from poetry.core._vendor.jsonschema.compat import int_types, str_types
-from poetry.core._vendor.jsonschema.exceptions import UndefinedTypeCheck
+from jsonschema.compat import int_types, str_types
+from jsonschema.exceptions import UndefinedTypeCheck
 
 
 def is_array(checker, instance):
diff --git a/poetry/core/_vendor/jsonschema/_utils.py b/poetry/core/_vendor/jsonschema/_utils.py
index 59ebb3385..117eec24b 100644
--- a/poetry/core/_vendor/jsonschema/_utils.py
+++ b/poetry/core/_vendor/jsonschema/_utils.py
@@ -3,7 +3,7 @@
 import os
 import re
 
-from poetry.core._vendor.jsonschema.compat import MutableMapping, str_types, urlsplit
+from jsonschema.compat import MutableMapping, str_types, urlsplit
 
 
 class URIDict(MutableMapping):
diff --git a/poetry/core/_vendor/jsonschema/_validators.py b/poetry/core/_vendor/jsonschema/_validators.py
index ea6b7f326..179fec09a 100644
--- a/poetry/core/_vendor/jsonschema/_validators.py
+++ b/poetry/core/_vendor/jsonschema/_validators.py
@@ -1,6 +1,6 @@
 import re
 
-from poetry.core._vendor.jsonschema._utils import (
+from jsonschema._utils import (
     ensure_list,
     equal,
     extras_msg,
@@ -9,8 +9,8 @@
     unbool,
     uniq,
 )
-from poetry.core._vendor.jsonschema.exceptions import FormatError, ValidationError
-from poetry.core._vendor.jsonschema.compat import iteritems
+from jsonschema.exceptions import FormatError, ValidationError
+from jsonschema.compat import iteritems
 
 
 def patternProperties(validator, patternProperties, instance, schema):
diff --git a/poetry/core/_vendor/jsonschema/benchmarks/issue232.py b/poetry/core/_vendor/jsonschema/benchmarks/issue232.py
index 316fe17d2..65e3aedf7 100644
--- a/poetry/core/_vendor/jsonschema/benchmarks/issue232.py
+++ b/poetry/core/_vendor/jsonschema/benchmarks/issue232.py
@@ -6,10 +6,10 @@
 """
 from twisted.python.filepath import FilePath
 from pyperf import Runner
-from poetry.core._vendor.pyrsistent import m
+from pyrsistent import m
 
-from poetry.core._vendor.jsonschema.tests._suite import Version
-from poetry.core._vendor import jsonschema
+from jsonschema.tests._suite import Version
+import jsonschema
 
 
 issue232 = Version(
diff --git a/poetry/core/_vendor/jsonschema/benchmarks/json_schema_test_suite.py b/poetry/core/_vendor/jsonschema/benchmarks/json_schema_test_suite.py
index 7f580c1b5..5add5051d 100644
--- a/poetry/core/_vendor/jsonschema/benchmarks/json_schema_test_suite.py
+++ b/poetry/core/_vendor/jsonschema/benchmarks/json_schema_test_suite.py
@@ -7,7 +7,7 @@
 """
 from pyperf import Runner
 
-from poetry.core._vendor.jsonschema.tests._suite import Suite
+from jsonschema.tests._suite import Suite
 
 
 if __name__ == "__main__":
diff --git a/poetry/core/_vendor/jsonschema/cli.py b/poetry/core/_vendor/jsonschema/cli.py
index ce3a5d309..ab3335b27 100644
--- a/poetry/core/_vendor/jsonschema/cli.py
+++ b/poetry/core/_vendor/jsonschema/cli.py
@@ -6,9 +6,9 @@
 import json
 import sys
 
-from poetry.core._vendor.jsonschema import __version__
-from poetry.core._vendor.jsonschema._reflect import namedAny
-from poetry.core._vendor.jsonschema.validators import validator_for
+from jsonschema import __version__
+from jsonschema._reflect import namedAny
+from jsonschema.validators import validator_for
 
 
 def _namedAnyWithDefault(name):
diff --git a/poetry/core/_vendor/jsonschema/exceptions.py b/poetry/core/_vendor/jsonschema/exceptions.py
index 7bbf3ce2c..691dcffe6 100644
--- a/poetry/core/_vendor/jsonschema/exceptions.py
+++ b/poetry/core/_vendor/jsonschema/exceptions.py
@@ -6,10 +6,10 @@
 import pprint
 import textwrap
 
-from poetry.core._vendor import attr
+import attr
 
-from poetry.core._vendor.jsonschema import _utils
-from poetry.core._vendor.jsonschema.compat import PY3, iteritems
+from jsonschema import _utils
+from jsonschema.compat import PY3, iteritems
 
 
 WEAK_MATCHES = frozenset(["anyOf", "oneOf"])
diff --git a/poetry/core/_vendor/jsonschema/validators.py b/poetry/core/_vendor/jsonschema/validators.py
index feda69000..1dc420c70 100644
--- a/poetry/core/_vendor/jsonschema/validators.py
+++ b/poetry/core/_vendor/jsonschema/validators.py
@@ -8,16 +8,16 @@
 import json
 import numbers
 
-from poetry.core._vendor.six import add_metaclass
+from six import add_metaclass
 
-from poetry.core._vendor.jsonschema import (
+from jsonschema import (
     _legacy_validators,
     _types,
     _utils,
     _validators,
     exceptions,
 )
-from poetry.core._vendor.jsonschema.compat import (
+from jsonschema.compat import (
     Sequence,
     int_types,
     iteritems,
@@ -33,7 +33,7 @@
 # Sigh. https://gitlab.com/pycqa/flake8/issues/280
 #       https://github.com/pyga/ebb-lint/issues/7
 # Imported for backwards compatibility.
-from poetry.core._vendor.jsonschema.exceptions import ErrorTree
+from jsonschema.exceptions import ErrorTree
 ErrorTree
 
 
diff --git a/poetry/core/_vendor/packaging/_typing.py b/poetry/core/_vendor/packaging/_typing.py
index 9df017596..dc6dfce7a 100644
--- a/poetry/core/_vendor/packaging/_typing.py
+++ b/poetry/core/_vendor/packaging/_typing.py
@@ -18,7 +18,7 @@
 
 In packaging, all static-typing related imports should be guarded as follows:
 
-    from poetry.core._vendor.packaging._typing import MYPY_CHECK_RUNNING
+    from packaging._typing import MYPY_CHECK_RUNNING
 
     if MYPY_CHECK_RUNNING:
         from typing import ...
diff --git a/poetry/core/_vendor/packaging/markers.py b/poetry/core/_vendor/packaging/markers.py
index 1cca2f9b7..f01747113 100644
--- a/poetry/core/_vendor/packaging/markers.py
+++ b/poetry/core/_vendor/packaging/markers.py
@@ -8,9 +8,9 @@
 import platform
 import sys
 
-from poetry.core._vendor.pyparsing import ParseException, ParseResults, stringStart, stringEnd
-from poetry.core._vendor.pyparsing import ZeroOrMore, Group, Forward, QuotedString
-from poetry.core._vendor.pyparsing import Literal as L  # noqa
+from pyparsing import ParseException, ParseResults, stringStart, stringEnd
+from pyparsing import ZeroOrMore, Group, Forward, QuotedString
+from pyparsing import Literal as L  # noqa
 
 from ._compat import string_types
 from ._typing import MYPY_CHECK_RUNNING
diff --git a/poetry/core/_vendor/packaging/requirements.py b/poetry/core/_vendor/packaging/requirements.py
index eae087bcc..1b547927d 100644
--- a/poetry/core/_vendor/packaging/requirements.py
+++ b/poetry/core/_vendor/packaging/requirements.py
@@ -6,10 +6,10 @@
 import string
 import re
 
-from poetry.core._vendor.pyparsing import stringStart, stringEnd, originalTextFor, ParseException
-from poetry.core._vendor.pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
-from poetry.core._vendor.pyparsing import Literal as L  # noqa
-from poetry.core._vendor.six.moves.urllib import parse as urlparse
+from pyparsing import stringStart, stringEnd, originalTextFor, ParseException
+from pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
+from pyparsing import Literal as L  # noqa
+from six.moves.urllib import parse as urlparse
 
 from ._typing import MYPY_CHECK_RUNNING
 from .markers import MARKER_EXPR, Marker
diff --git a/poetry/core/_vendor/pyparsing.py b/poetry/core/_vendor/pyparsing.py
index d5dd35c1e..4d2f98e46 100644
--- a/poetry/core/_vendor/pyparsing.py
+++ b/poetry/core/_vendor/pyparsing.py
@@ -41,7 +41,7 @@
 (the :class:`'+'<ParserElement.__add__>` operators create :class:`And` expressions,
 and the strings are auto-converted to :class:`Literal` expressions)::
 
-    from poetry.core._vendor.pyparsing import Word, alphas
+    from pyparsing import Word, alphas
 
     # define grammar of a greeting
     greet = Word(alphas) + "," + Word(alphas) + "!"
@@ -1881,7 +1881,7 @@ def enablePackrat(cache_size_limit=128):
 
            Example::
 
-               from poetry.core._vendor import pyparsing
+               import pyparsing
                pyparsing.ParserElement.enablePackrat()
         """
         if not ParserElement._packratEnabled:
diff --git a/poetry/core/_vendor/pyrsistent/__init__.py b/poetry/core/_vendor/pyrsistent/__init__.py
index 635aad184..be299658f 100644
--- a/poetry/core/_vendor/pyrsistent/__init__.py
+++ b/poetry/core/_vendor/pyrsistent/__init__.py
@@ -1,35 +1,35 @@
 # -*- coding: utf-8 -*-
 
-from poetry.core._vendor.pyrsistent._pmap import pmap, m, PMap
+from pyrsistent._pmap import pmap, m, PMap
 
-from poetry.core._vendor.pyrsistent._pvector import pvector, v, PVector
+from pyrsistent._pvector import pvector, v, PVector
 
-from poetry.core._vendor.pyrsistent._pset import pset, s, PSet
+from pyrsistent._pset import pset, s, PSet
 
-from poetry.core._vendor.pyrsistent._pbag import pbag, b, PBag
+from pyrsistent._pbag import pbag, b, PBag
 
-from poetry.core._vendor.pyrsistent._plist import plist, l, PList
+from pyrsistent._plist import plist, l, PList
 
-from poetry.core._vendor.pyrsistent._pdeque import pdeque, dq, PDeque
+from pyrsistent._pdeque import pdeque, dq, PDeque
 
-from poetry.core._vendor.pyrsistent._checked_types import (
+from pyrsistent._checked_types import (
     CheckedPMap, CheckedPVector, CheckedPSet, InvariantException, CheckedKeyTypeError,
     CheckedValueTypeError, CheckedType, optional)
 
-from poetry.core._vendor.pyrsistent._field_common import (
+from pyrsistent._field_common import (
     field, PTypeError, pset_field, pmap_field, pvector_field)
 
-from poetry.core._vendor.pyrsistent._precord import PRecord
+from pyrsistent._precord import PRecord
 
-from poetry.core._vendor.pyrsistent._pclass import PClass, PClassMeta
+from pyrsistent._pclass import PClass, PClassMeta
 
-from poetry.core._vendor.pyrsistent._immutable import immutable
+from pyrsistent._immutable import immutable
 
-from poetry.core._vendor.pyrsistent._helpers import freeze, thaw, mutant
+from pyrsistent._helpers import freeze, thaw, mutant
 
-from poetry.core._vendor.pyrsistent._transformations import inc, discard, rex, ny
+from pyrsistent._transformations import inc, discard, rex, ny
 
-from poetry.core._vendor.pyrsistent._toolz import get_in
+from pyrsistent._toolz import get_in
 
 
 __all__ = ('pmap', 'm', 'PMap',
diff --git a/poetry/core/_vendor/pyrsistent/_checked_types.py b/poetry/core/_vendor/pyrsistent/_checked_types.py
index 97f968bce..293d989f1 100644
--- a/poetry/core/_vendor/pyrsistent/_checked_types.py
+++ b/poetry/core/_vendor/pyrsistent/_checked_types.py
@@ -1,10 +1,10 @@
 from ._compat import Iterable
-from poetry.core._vendor import six
+import six
 
-from poetry.core._vendor.pyrsistent._compat import Enum, string_types
-from poetry.core._vendor.pyrsistent._pmap import PMap, pmap
-from poetry.core._vendor.pyrsistent._pset import PSet, pset
-from poetry.core._vendor.pyrsistent._pvector import PythonPVector, python_pvector
+from pyrsistent._compat import Enum, string_types
+from pyrsistent._pmap import PMap, pmap
+from pyrsistent._pset import PSet, pset
+from pyrsistent._pvector import PythonPVector, python_pvector
 
 
 class CheckedType(object):
diff --git a/poetry/core/_vendor/pyrsistent/_compat.py b/poetry/core/_vendor/pyrsistent/_compat.py
index 829a76284..e728586af 100644
--- a/poetry/core/_vendor/pyrsistent/_compat.py
+++ b/poetry/core/_vendor/pyrsistent/_compat.py
@@ -1,4 +1,4 @@
-from poetry.core._vendor.six import string_types
+from six import string_types
 
 
 # enum compat
diff --git a/poetry/core/_vendor/pyrsistent/_field_common.py b/poetry/core/_vendor/pyrsistent/_field_common.py
index 64f2386c9..ca1cccd43 100644
--- a/poetry/core/_vendor/pyrsistent/_field_common.py
+++ b/poetry/core/_vendor/pyrsistent/_field_common.py
@@ -1,7 +1,7 @@
-from poetry.core._vendor import six
+import six
 import sys
 
-from poetry.core._vendor.pyrsistent._checked_types import (
+from pyrsistent._checked_types import (
     CheckedPMap,
     CheckedPSet,
     CheckedPVector,
@@ -12,8 +12,8 @@
     maybe_parse_user_type,
     maybe_parse_many_user_types,
 )
-from poetry.core._vendor.pyrsistent._checked_types import optional as optional_type
-from poetry.core._vendor.pyrsistent._checked_types import wrap_invariant
+from pyrsistent._checked_types import optional as optional_type
+from pyrsistent._checked_types import wrap_invariant
 import inspect
 
 PY2 = sys.version_info[0] < 3
diff --git a/poetry/core/_vendor/pyrsistent/_helpers.py b/poetry/core/_vendor/pyrsistent/_helpers.py
index 0359a6ef4..c9c58feac 100644
--- a/poetry/core/_vendor/pyrsistent/_helpers.py
+++ b/poetry/core/_vendor/pyrsistent/_helpers.py
@@ -1,8 +1,8 @@
 from functools import wraps
-from poetry.core._vendor import six
-from poetry.core._vendor.pyrsistent._pmap import PMap, pmap
-from poetry.core._vendor.pyrsistent._pset import PSet, pset
-from poetry.core._vendor.pyrsistent._pvector import PVector, pvector
+import six
+from pyrsistent._pmap import PMap, pmap
+from pyrsistent._pset import PSet, pset
+from pyrsistent._pvector import PVector, pvector
 
 
 def freeze(o):
diff --git a/poetry/core/_vendor/pyrsistent/_immutable.py b/poetry/core/_vendor/pyrsistent/_immutable.py
index 19c200a36..a89bd7552 100644
--- a/poetry/core/_vendor/pyrsistent/_immutable.py
+++ b/poetry/core/_vendor/pyrsistent/_immutable.py
@@ -1,6 +1,6 @@
 import sys
 
-from poetry.core._vendor import six
+import six
 
 
 def immutable(members='', name='Immutable', verbose=False):
diff --git a/poetry/core/_vendor/pyrsistent/_pbag.py b/poetry/core/_vendor/pyrsistent/_pbag.py
index 9af7f1adf..9905e9a6e 100644
--- a/poetry/core/_vendor/pyrsistent/_pbag.py
+++ b/poetry/core/_vendor/pyrsistent/_pbag.py
@@ -1,6 +1,6 @@
 from ._compat import Container, Iterable, Sized, Hashable
 from functools import reduce
-from poetry.core._vendor.pyrsistent._pmap import pmap
+from pyrsistent._pmap import pmap
 
 
 def _add_to_counters(counters, element):
diff --git a/poetry/core/_vendor/pyrsistent/_pclass.py b/poetry/core/_vendor/pyrsistent/_pclass.py
index 608f1c3c3..a437f7164 100644
--- a/poetry/core/_vendor/pyrsistent/_pclass.py
+++ b/poetry/core/_vendor/pyrsistent/_pclass.py
@@ -1,9 +1,9 @@
-from poetry.core._vendor import six
-from poetry.core._vendor.pyrsistent._checked_types import (InvariantException, CheckedType, _restore_pickle, store_invariants)
-from poetry.core._vendor.pyrsistent._field_common import (
+import six
+from pyrsistent._checked_types import (InvariantException, CheckedType, _restore_pickle, store_invariants)
+from pyrsistent._field_common import (
     set_fields, check_type, is_field_ignore_extra_complaint, PFIELD_NO_INITIAL, serialize, check_global_invariants
 )
-from poetry.core._vendor.pyrsistent._transformations import transform
+from pyrsistent._transformations import transform
 
 
 def _is_pclass(bases):
diff --git a/poetry/core/_vendor/pyrsistent/_pdeque.py b/poetry/core/_vendor/pyrsistent/_pdeque.py
index 8727e435b..5147b3fa6 100644
--- a/poetry/core/_vendor/pyrsistent/_pdeque.py
+++ b/poetry/core/_vendor/pyrsistent/_pdeque.py
@@ -1,7 +1,7 @@
 from ._compat import Sequence, Hashable
 from itertools import islice, chain
 from numbers import Integral
-from poetry.core._vendor.pyrsistent._plist import plist
+from pyrsistent._plist import plist
 
 
 class PDeque(object):
diff --git a/poetry/core/_vendor/pyrsistent/_pmap.py b/poetry/core/_vendor/pyrsistent/_pmap.py
index 98136b14a..e8a0ec53f 100644
--- a/poetry/core/_vendor/pyrsistent/_pmap.py
+++ b/poetry/core/_vendor/pyrsistent/_pmap.py
@@ -1,8 +1,8 @@
 from ._compat import Mapping, Hashable
 from itertools import chain
-from poetry.core._vendor import six
-from poetry.core._vendor.pyrsistent._pvector import pvector
-from poetry.core._vendor.pyrsistent._transformations import transform
+import six
+from pyrsistent._pvector import pvector
+from pyrsistent._transformations import transform
 
 
 class PMap(object):
diff --git a/poetry/core/_vendor/pyrsistent/_precord.py b/poetry/core/_vendor/pyrsistent/_precord.py
index 0ce9240b4..ec8d32c3d 100644
--- a/poetry/core/_vendor/pyrsistent/_precord.py
+++ b/poetry/core/_vendor/pyrsistent/_precord.py
@@ -1,9 +1,9 @@
-from poetry.core._vendor import six
-from poetry.core._vendor.pyrsistent._checked_types import CheckedType, _restore_pickle, InvariantException, store_invariants
-from poetry.core._vendor.pyrsistent._field_common import (
+import six
+from pyrsistent._checked_types import CheckedType, _restore_pickle, InvariantException, store_invariants
+from pyrsistent._field_common import (
     set_fields, check_type, is_field_ignore_extra_complaint, PFIELD_NO_INITIAL, serialize, check_global_invariants
 )
-from poetry.core._vendor.pyrsistent._pmap import PMap, pmap
+from pyrsistent._pmap import PMap, pmap
 
 
 class _PRecordMeta(type):
diff --git a/poetry/core/_vendor/pyrsistent/_pset.py b/poetry/core/_vendor/pyrsistent/_pset.py
index c9d989f69..a972ec533 100644
--- a/poetry/core/_vendor/pyrsistent/_pset.py
+++ b/poetry/core/_vendor/pyrsistent/_pset.py
@@ -1,6 +1,6 @@
 from ._compat import Set, Hashable
 import sys
-from poetry.core._vendor.pyrsistent._pmap import pmap
+from pyrsistent._pmap import pmap
 
 PY2 = sys.version_info[0] < 3
 
diff --git a/poetry/core/_vendor/pyrsistent/_pvector.py b/poetry/core/_vendor/pyrsistent/_pvector.py
index 35725f2e9..82232782b 100644
--- a/poetry/core/_vendor/pyrsistent/_pvector.py
+++ b/poetry/core/_vendor/pyrsistent/_pvector.py
@@ -2,8 +2,8 @@
 from ._compat import Sequence, Hashable
 from numbers import Integral
 import operator
-from poetry.core._vendor import six
-from poetry.core._vendor.pyrsistent._transformations import transform
+import six
+from pyrsistent._transformations import transform
 
 
 def _bitcount(val):
diff --git a/poetry/core/_vendor/pyrsistent/_toolz.py b/poetry/core/_vendor/pyrsistent/_toolz.py
index c0e75353c..6643ee860 100644
--- a/poetry/core/_vendor/pyrsistent/_toolz.py
+++ b/poetry/core/_vendor/pyrsistent/_toolz.py
@@ -39,7 +39,7 @@
 DAMAGE.
 """
 import operator
-from poetry.core._vendor.six.moves import reduce
+from six.moves import reduce
 
 
 def get_in(keys, coll, default=None, no_default=False):
diff --git a/poetry/core/_vendor/pyrsistent/_transformations.py b/poetry/core/_vendor/pyrsistent/_transformations.py
index 4b66c0e7b..612098969 100644
--- a/poetry/core/_vendor/pyrsistent/_transformations.py
+++ b/poetry/core/_vendor/pyrsistent/_transformations.py
@@ -1,5 +1,5 @@
 import re
-from poetry.core._vendor import six
+import six
 try:
     from inspect import Parameter, signature
 except ImportError:
@@ -121,7 +121,7 @@ def _get_arity(f):
 
 
 def _update_structure(structure, kvs, path, command):
-    from poetry.core._vendor.pyrsistent._pmap import pmap
+    from pyrsistent._pmap import pmap
     e = structure.evolver()
     if not path and command is discard:
         # Do this in reverse to avoid index problems with vectors. See #92.
diff --git a/poetry/core/_vendor/pyrsistent/typing.py b/poetry/core/_vendor/pyrsistent/typing.py
index 3a4efe0d5..6a86c831b 100644
--- a/poetry/core/_vendor/pyrsistent/typing.py
+++ b/poetry/core/_vendor/pyrsistent/typing.py
@@ -5,8 +5,8 @@
 
 For example,
 
-    from poetry.core._vendor.pyrsistent import pvector
-    from poetry.core._vendor.pyrsistent.typing import PVector
+    from pyrsistent import pvector
+    from pyrsistent.typing import PVector
 
     myvector: PVector[str] = pvector(['a', 'b', 'c'])
 
diff --git a/poetry/core/json/__init__.py b/poetry/core/json/__init__.py
index e970a1700..83ecab77c 100644
--- a/poetry/core/json/__init__.py
+++ b/poetry/core/json/__init__.py
@@ -4,7 +4,7 @@
 from io import open
 from typing import List
 
-from poetry.core._vendor.jsonschema import Draft7Validator
+from jsonschema import Draft7Validator
 
 
 SCHEMA_DIR = os.path.join(os.path.dirname(__file__), "schemas")
diff --git a/poetry/core/masonry/builders/wheel.py b/poetry/core/masonry/builders/wheel.py
index e7d11bacb..257ac67f5 100644
--- a/poetry/core/masonry/builders/wheel.py
+++ b/poetry/core/masonry/builders/wheel.py
@@ -14,8 +14,7 @@
 from base64 import urlsafe_b64encode
 from io import StringIO
 
-from poetry.core._vendor.packaging.tags import sys_tags
-
+from packaging.tags import sys_tags
 from poetry.core import __version__
 from poetry.core.semver import parse_constraint
 from poetry.core.utils._compat import decode
diff --git a/poetry/core/packages/utils/utils.py b/poetry/core/packages/utils/utils.py
index c0fed5388..bbfed85c2 100644
--- a/poetry/core/packages/utils/utils.py
+++ b/poetry/core/packages/utils/utils.py
@@ -5,10 +5,6 @@
 
 from typing import Union
 
-from poetry.core._vendor.six.moves.urllib.parse import unquote  # noqa
-from poetry.core._vendor.six.moves.urllib.parse import urlsplit  # noqa
-from poetry.core._vendor.six.moves.urllib.request import url2pathname  # noqa
-
 from poetry.core.packages.constraints.constraint import Constraint
 from poetry.core.packages.constraints.multi_constraint import MultiConstraint
 from poetry.core.packages.constraints.union_constraint import UnionConstraint
@@ -23,6 +19,9 @@
 from poetry.core.version.markers import MarkerUnion
 from poetry.core.version.markers import MultiMarker
 from poetry.core.version.markers import SingleMarker
+from six.moves.urllib.parse import unquote  # noqa
+from six.moves.urllib.parse import urlsplit  # noqa
+from six.moves.urllib.request import url2pathname  # noqa
 
 
 BZ2_EXTENSIONS = (".tar.bz2", ".tbz")
diff --git a/poetry/core/utils/_compat.py b/poetry/core/utils/_compat.py
index 4dfb42e22..2c61c4e55 100644
--- a/poetry/core/utils/_compat.py
+++ b/poetry/core/utils/_compat.py
@@ -1,6 +1,6 @@
 import sys
 
-import poetry.core._vendor.six.moves.urllib.parse as urllib_parse
+import six.moves.urllib.parse as urllib_parse
 
 
 urlparse = urllib_parse
diff --git a/poetry/core/utils/toml_file.py b/poetry/core/utils/toml_file.py
index 5c327e7ed..648defa2a 100644
--- a/poetry/core/utils/toml_file.py
+++ b/poetry/core/utils/toml_file.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from typing import Union
 
-from poetry.core._vendor.tomlkit.toml_file import TOMLFile as BaseTOMLFile
+from tomlkit.toml_file import TOMLFile as BaseTOMLFile
 
 from ._compat import Path
 
diff --git a/poetry/core/version/markers.py b/poetry/core/version/markers.py
index 22edf0f4c..1283145c0 100644
--- a/poetry/core/version/markers.py
+++ b/poetry/core/version/markers.py
@@ -5,14 +5,14 @@
 from typing import Iterator
 from typing import List
 
-from poetry.core._vendor.pyparsing import Forward
-from poetry.core._vendor.pyparsing import Group
-from poetry.core._vendor.pyparsing import Literal as L  # noqa
-from poetry.core._vendor.pyparsing import ParseResults
-from poetry.core._vendor.pyparsing import QuotedString
-from poetry.core._vendor.pyparsing import ZeroOrMore
-from poetry.core._vendor.pyparsing import stringEnd
-from poetry.core._vendor.pyparsing import stringStart
+from pyparsing import Forward
+from pyparsing import Group
+from pyparsing import Literal as L  # noqa
+from pyparsing import ParseResults
+from pyparsing import QuotedString
+from pyparsing import ZeroOrMore
+from pyparsing import stringEnd
+from pyparsing import stringStart
 
 
 class InvalidMarker(ValueError):
diff --git a/poetry/core/version/requirements.py b/poetry/core/version/requirements.py
index 8b70b7860..60b8f7546 100644
--- a/poetry/core/version/requirements.py
+++ b/poetry/core/version/requirements.py
@@ -8,18 +8,17 @@
 import re
 import string
 
-from poetry.core._vendor.pyparsing import Combine
-from poetry.core._vendor.pyparsing import Literal as L  # noqa
-from poetry.core._vendor.pyparsing import Optional
-from poetry.core._vendor.pyparsing import ParseException
-from poetry.core._vendor.pyparsing import Regex
-from poetry.core._vendor.pyparsing import Word
-from poetry.core._vendor.pyparsing import ZeroOrMore
-from poetry.core._vendor.pyparsing import originalTextFor
-from poetry.core._vendor.pyparsing import stringEnd
-from poetry.core._vendor.pyparsing import stringStart
-
 from poetry.core.semver import parse_constraint
+from pyparsing import Combine
+from pyparsing import Literal as L  # noqa
+from pyparsing import Optional
+from pyparsing import ParseException
+from pyparsing import Regex
+from pyparsing import Word
+from pyparsing import ZeroOrMore
+from pyparsing import originalTextFor
+from pyparsing import stringEnd
+from pyparsing import stringStart
 
 from .markers import MARKER_EXPR
 from .markers import parse_marker
diff --git a/pyproject.toml b/pyproject.toml
index 52e1a7c5b..d02f19a91 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,10 @@ classifiers = [
 packages = [
     {include = "poetry"},
 ]
+exclude = [
+    "**/*.pyc",
+    "**/*.pyi",
+]
 
 [tool.poetry.dependencies]
 python = "~2.7 || ^3.5"
@@ -87,7 +91,7 @@ known_third_party = ["poetry.core._vendor"]
 [tool.vendoring]
 destination = "poetry/core/_vendor/"
 requirements = "poetry/core/_vendor/vendor.txt"
-namespace = "poetry.core._vendor"
+namespace = ""
 
 protected-files = ["__init__.py", "README.md", "vendor.txt"]
 patches-dir = "vendors/patches"
diff --git a/vendors/patches/jsonschema.patch b/vendors/patches/jsonschema.patch
index f56a4e7b7..423e641d3 100644
--- a/vendors/patches/jsonschema.patch
+++ b/vendors/patches/jsonschema.patch
@@ -2,7 +2,7 @@ diff --git a/poetry/core/_vendor/jsonschema/__init__.py b/poetry/core/_vendor/js
 index 7dd3598..c604eed 100644
 --- a/poetry/core/_vendor/jsonschema/__init__.py
 +++ b/poetry/core/_vendor/jsonschema/__init__.py
-@@ -27,8 +27,5 @@ from poetry_core._vendor.jsonschema.validators import (
+@@ -27,8 +27,5 @@ from jsonschema.validators import (
      RefResolver,
      validate,
  )
@@ -24,7 +24,7 @@ index 8fb8593..368474a 100644
 +import os
  import re
 
- from poetry.core._vendor.jsonschema.compat import MutableMapping, str_types, urlsplit
+ from jsonschema.compat import MutableMapping, str_types, urlsplit
 @@ -50,9 +50,12 @@ def load_schema(name):
      """
      Load a schema from ./schemas/``name``.json and return it.