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diff --git a/pip/req/req_install.py b/pip/req/req_install.py
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index 6911fba..8524932 100644
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--- a/pip/req/req_install.py
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+++ b/pip/req/req_install.py
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@@ -34,7 +34,7 @@ from pip.locations import (
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)
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from pip.utils import (
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display_path, rmtree, ask_path_exists, backup_dir, is_installable_dir,
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- dist_in_usersite, dist_in_site_packages, egg_link_path,
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+ dist_in_usersite, dist_in_site_packages, dist_in_install_path, egg_link_path,
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call_subprocess, read_text_file, FakeFile, _make_build_dir, ensure_dir,
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get_installed_version, normalize_path, dist_is_local,
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)
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@@ -1049,7 +1049,7 @@ class InstallRequirement(object):
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"lack sys.path precedence to %s in %s" %
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(existing_dist.project_name, existing_dist.location)
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)
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- else:
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+ elif dist_in_install_path(existing_dist):
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self.conflicts_with = existing_dist
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return True
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diff --git a/pip/req/req_set.py b/pip/req/req_set.py
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index 76aec06..b93304a 100644
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--- a/pip/req/req_set.py
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+++ b/pip/req/req_set.py
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@@ -18,7 +18,8 @@ from pip.exceptions import (InstallationError, BestVersionAlreadyInstalled,
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UnsupportedPythonVersion)
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from pip.req.req_install import InstallRequirement
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from pip.utils import (
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- display_path, dist_in_usersite, ensure_dir, normalize_path)
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+ display_path, dist_in_usersite, dist_in_install_path, ensure_dir,
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+ normalize_path)
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from pip.utils.hashes import MissingHashes
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from pip.utils.logging import indent_log
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from pip.utils.packaging import check_dist_requires_python
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@@ -437,10 +438,12 @@ class RequirementSet(object):
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if not best_installed:
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# don't uninstall conflict if user install and
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- # conflict is not user install
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+ # conflict is not user install or conflict lives
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+ # in a different path (/usr/lib vs /usr/local/lib/)
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if not (self.use_user_site and not
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- dist_in_usersite(req_to_install.satisfied_by)):
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- req_to_install.conflicts_with = \
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+ dist_in_usersite(req_to_install.satisfied_by) or not
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+ dist_in_install_path(req_to_install.satisfied_by)):
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+ req_to_install.conflicts_with = \
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req_to_install.satisfied_by
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req_to_install.satisfied_by = None
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@@ -644,10 +647,12 @@ class RequirementSet(object):
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if req_to_install.satisfied_by:
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if self.upgrade or self.ignore_installed:
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# don't uninstall conflict if user install and
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- # conflict is not user install
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+ # conflict is not user install or conflict lives
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+ # in a different path (/usr/lib vs /usr/local/lib/)
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if not (self.use_user_site and not
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dist_in_usersite(
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- req_to_install.satisfied_by)):
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+ req_to_install.satisfied_by) or not
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+ dist_in_install_path(req_to_install.satisfied_by)):
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req_to_install.conflicts_with = \
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req_to_install.satisfied_by
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req_to_install.satisfied_by = None
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diff --git a/pip/utils/__init__.py b/pip/utils/__init__.py
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index 815bd33..0ed59f7 100644
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--- a/pip/utils/__init__.py
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+++ b/pip/utils/__init__.py
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@@ -22,7 +22,7 @@ from pip.exceptions import InstallationError
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from pip.compat import console_to_str, expanduser, stdlib_pkgs
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from pip.locations import (
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site_packages, user_site, running_under_virtualenv, virtualenv_no_global,
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- write_delete_marker_file,
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+ write_delete_marker_file, distutils_scheme,
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)
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from pip._vendor import pkg_resources
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from pip._vendor.six.moves import input
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@@ -315,6 +315,16 @@ def dist_in_site_packages(dist):
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).startswith(normalize_path(site_packages))
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+def dist_in_install_path(dist):
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+ """
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+ Return True if given Distribution is installed in
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+ path matching distutils_scheme layout.
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+ """
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+ norm_path = normalize_path(dist_location(dist))
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+ return norm_path.startswith(normalize_path(
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+ distutils_scheme("")['purelib'].split('python')[0]))
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+
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+
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def dist_is_editable(dist):
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"""Is distribution an editable install?"""
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for path_item in sys.path:
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