Ignore incompatibilities when resolve dist

news/4549.bugfix.rst

@@ -0,0 +1 @@
+Fix a bug that ``importlib-metadata`` from the project's dependencies conflicts with that from ``pipenv``'s.

pipenv/environment.py

@@ -118,7 +118,12 @@ class Environment(object):
         except (KeyError, AttributeError, OSError, IOError):  # The METADATA file can't be found
             return deps
         for req in reqs:
-            dist = working_set.find(req)
+            try:
+                dist = working_set.find(req)
+            except pkg_resources.VersionConflict:
+                # https://github.com/pypa/pipenv/issues/4549
+                # The requirement is already present with incompatible version.
+                continue
             deps |= cls.resolve_dist(dist, working_set)
         return deps
 

pipenv/resolver.py

@@ -12,7 +12,7 @@ os.environ["PIP_PYTHON_PATH"] = str(sys.executable)
 
 def find_site_path(pkg, site_dir=None):
     import pkg_resources
-    if site_dir is not None:
+    if site_dir is None:
         site_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
     working_set = pkg_resources.WorkingSet([site_dir] + sys.path[:])
     for dist in working_set: