code: def incompatibilities_for(
          self, package
      ):  # type: (DependencyPackage) -> List[Incompatibility]
          
          if package.is_root():
              dependencies = package.all_requires
          else:
              dependencies = package.requires
  
              if not package.python_constraint.allows_all(
                  self._package.python_constraint
              ):
                  intersection = package.python_constraint.intersect(
                      package.dependency.transitive_python_constraint
                  )
                  difference = package.dependency.transitive_python_constraint.difference(
                      intersection
                  )
                  if (
                      package.dependency.transitive_python_constraint.is_any()
                      or self._package.python_constraint.intersect(
                          package.dependency.python_constraint
                      ).is_empty()
                      or intersection.is_empty()
                      or not difference.is_empty()
                  ):
                      return [
                          Incompatibility(
                              [Term(package.to_dependency(), True)],
                              PythonCause(
                                  package.python_versions, self._package.python_versions
                              ),
                          )
                      ]
  
          dependencies = [
              dep
              for dep in dependencies
              if dep.name not in self.UNSAFE_PACKAGES
              and self._package.python_constraint.allows_any(dep.python_constraint)
          ]
  
          return [
              Incompatibility(
                  [Term(package.to_dependency(), True), Term(dep, False)],
                  DependencyCause(),
              )
              for dep in dependencies
          ]
docs: Returns incompatibilities that encapsulate a given package's dependencies,
          or that it can't be safely selected.
  
          If multiple subsequent versions of this package have the same
          dependencies, this will return incompatibilities that reflect that. It
          won't return incompatibilities that have already been returned by a
          previous call to _incompatibilities_for().