Fullscreen eingestellt.

.venv/Lib/site-packages/pip/_internal/commands/install.py

@@ -14,7 +14,6 @@ from pip._internal.cli import cmdoptions
 from pip._internal.cli.cmdoptions import make_target_python
 from pip._internal.cli.req_command import (
     RequirementCommand,
-    warn_if_run_as_root,
     with_cleanup,
 )
 from pip._internal.cli.status_codes import ERROR, SUCCESS
@@ -37,6 +36,7 @@ from pip._internal.utils.misc import (
     ensure_dir,
     get_pip_version,
     protect_pip_from_modification_on_windows,
+    warn_if_run_as_root,
     write_output,
 )
 from pip._internal.utils.temp_dir import TempDirectory
@@ -387,9 +387,6 @@ class InstallCommand(RequirementCommand):
                         json.dump(report.to_dict(), f, indent=2, ensure_ascii=False)
 
             if options.dry_run:
-                # In non dry-run mode, the legacy versions and specifiers check
-                # will be done as part of conflict detection.
-                requirement_set.warn_legacy_versions_and_specifiers()
                 would_install_items = sorted(
                     (r.metadata["name"], r.metadata["version"])
                     for r in requirement_set.requirements_to_install
@@ -409,6 +406,12 @@ class InstallCommand(RequirementCommand):
                 # If we're not replacing an already installed pip,
                 # we're not modifying it.
                 modifying_pip = pip_req.satisfied_by is None
+                if modifying_pip:
+                    # Eagerly import this module to avoid crashes. Otherwise, this
+                    # module would be imported *after* pip was replaced, resulting in
+                    # crashes if the new self_outdated_check module was incompatible
+                    # with the rest of pip that's already imported.
+                    import pip._internal.self_outdated_check  # noqa: F401
             protect_pip_from_modification_on_windows(modifying_pip=modifying_pip)
 
             reqs_to_build = [
@@ -427,8 +430,8 @@ class InstallCommand(RequirementCommand):
 
             if build_failures:
                 raise InstallationError(
-                    "Could not build wheels for {}, which is required to "
-                    "install pyproject.toml-based projects".format(
+                    "ERROR: Failed to build installable wheels for some "
+                    "pyproject.toml based projects ({})".format(
                         ", ".join(r.name for r in build_failures)  # type: ignore
                     )
                 )