Eliminado venv y www del repositorio, agrege un requirements igual

venv/lib/python3.8/site-packages/pip/_internal/operations/check.py

@@ -29,6 +29,7 @@ if MYPY_CHECK_RUNNING:
     MissingDict = Dict[str, List[Missing]]
     ConflictingDict = Dict[str, List[Conflicting]]
     CheckResult = Tuple[MissingDict, ConflictingDict]
+    ConflictDetails = Tuple[PackageSet, CheckResult]
 
 PackageDetails = namedtuple('PackageDetails', ['version', 'requires'])
 
@@ -47,9 +48,9 @@ def create_package_set_from_installed(**kwargs):
         name = canonicalize_name(dist.project_name)
         try:
             package_set[name] = PackageDetails(dist.version, dist.requires())
-        except RequirementParseError as e:
-            # Don't crash on broken metadata
-            logging.warning("Error parsing requirements for %s: %s", name, e)
+        except (OSError, RequirementParseError) as e:
+            # Don't crash on unreadable or broken metadata
+            logger.warning("Error parsing requirements for %s: %s", name, e)
             problems = True
     return package_set, problems
 
@@ -61,19 +62,16 @@ def check_package_set(package_set, should_ignore=None):
     If should_ignore is passed, it should be a callable that takes a
     package name and returns a boolean.
     """
-    if should_ignore is None:
-        def should_ignore(name):
-            return False
 
-    missing = dict()
-    conflicting = dict()
+    missing = {}
+    conflicting = {}
 
     for package_name in package_set:
         # Info about dependencies of package_name
         missing_deps = set()  # type: Set[Missing]
         conflicting_deps = set()  # type: Set[Conflicting]
 
-        if should_ignore(package_name):
+        if should_ignore and should_ignore(package_name):
             continue
 
         for req in package_set[package_name].requires:
@@ -102,7 +100,7 @@ def check_package_set(package_set, should_ignore=None):
 
 
 def check_install_conflicts(to_install):
-    # type: (List[InstallRequirement]) -> Tuple[PackageSet, CheckResult]
+    # type: (List[InstallRequirement]) -> ConflictDetails
     """For checking if the dependency graph would be consistent after \
     installing given requirements
     """
@@ -135,6 +133,7 @@ def _simulate_installation_of(to_install, package_set):
         abstract_dist = make_distribution_for_install_requirement(inst_req)
         dist = abstract_dist.get_pkg_resources_distribution()
 
+        assert dist is not None
         name = canonicalize_name(dist.key)
         package_set[name] = PackageDetails(dist.version, dist.requires())