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1 change: 1 addition & 0 deletions news/9789.removal.rst
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Remove the ability to use ``pip list --outdated`` in combination with ``--format=freeze``.
5 changes: 5 additions & 0 deletions src/pip/_internal/commands/list.py
Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,11 @@ def run(self, options: Values, args: List[str]) -> int:
if options.outdated and options.uptodate:
raise CommandError("Options --outdated and --uptodate cannot be combined.")

if options.outdated and options.list_format == "freeze":
raise CommandError(
"List format 'freeze' can not be used with the --outdated option."
)

cmdoptions.check_list_path_option(options)

skip = set(stdlib_pkgs)
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8 changes: 6 additions & 2 deletions tests/functional/test_list.py
Original file line number Diff line number Diff line change
Expand Up @@ -577,16 +577,20 @@ def test_outdated_formats(script: PipTestEnvironment, data: TestData) -> None:
assert "Package Version Latest Type" in result.stdout
assert "simple 1.0 1.1 wheel" in result.stdout

# Check freeze
# Check that freeze is not allowed
result = script.pip(
"list",
"--no-index",
"--find-links",
wheelhouse_path,
"--outdated",
"--format=freeze",
expect_error=True,
)
assert (
"List format 'freeze' can not be used with the --outdated option."
in result.stderr
)
assert "simple==1.0" in result.stdout

# Check json
result = script.pip(
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