bug: Removed --python flag dependency when --force is passed

changelog.d/1304.bugfix.md

@@ -0,0 +1 @@
+Only show `--python` and `--force` flag warning if both flags are present

src/pipx/commands/install.py

@@ -29,11 +29,11 @@ def install(
     include_dependencies: bool,
     preinstall_packages: Optional[List[str]],
     suffix: str = "",
+    python_flag_passed=False,
 ) -> ExitCode:
     """Returns pipx exit code."""
     # package_spec is anything pip-installable, including package_name, vcs spec,
     #   zip file, or tar.gz file.
-    python_flag_was_passed = python is not None
 
     python = python or DEFAULT_PYTHON
 
@@ -57,7 +57,7 @@ def install(
         venv = Venv(venv_dir, python=python, verbose=verbose)
         venv.check_upgrade_shared_libs(pip_args=pip_args, verbose=verbose)
         if exists:
-            if not reinstall and force and python_flag_was_passed:
+            if not reinstall and force and python_flag_passed:
                 print(
                     pipx_wrap(
                         f"""

src/pipx/commands/reinstall.py

@@ -26,6 +26,7 @@ def reinstall(
     python: str,
     verbose: bool,
     force_reinstall_shared_libs: bool = False,
+    python_flag_passed: bool = False,
 ) -> ExitCode:
     """Returns pipx exit code."""
     if not venv_dir.exists():
@@ -74,6 +75,7 @@ def reinstall(
         include_dependencies=venv.pipx_metadata.main_package.include_dependencies,
         preinstall_packages=[],
         suffix=venv.pipx_metadata.main_package.suffix,
+        python_flag_passed=python_flag_passed,
     )
 
     # now install injected packages
@@ -105,6 +107,7 @@ def reinstall_all(
     verbose: bool,
     *,
     skip: Sequence[str],
+    python_flag_passed: bool = False,
 ) -> ExitCode:
     """Returns pipx exit code."""
     failed: List[str] = []
@@ -124,6 +127,7 @@ def reinstall_all(
                 python=python,
                 verbose=verbose,
                 force_reinstall_shared_libs=first_reinstall,
+                python_flag_passed=python_flag_passed,
             )
         except PipxError as e:
             print(e, file=sys.stderr)

src/pipx/commands/upgrade.py

@@ -104,6 +104,7 @@ def _upgrade_venv(
     force: bool,
     install: bool = False,
     python: Optional[str] = None,
+    python_flag_passed: bool = False,
 ) -> int:
     """Return number of packages with changed versions."""
     if not venv_dir.is_dir():
@@ -122,6 +123,7 @@ def _upgrade_venv(
                 reinstall=False,
                 include_dependencies=False,
                 preinstall_packages=None,
+                python_flag_passed=python_flag_passed,
             )
             return 0
         else:
@@ -186,6 +188,7 @@ def upgrade(
     include_injected: bool,
     force: bool,
     install: bool,
+    python_flag_passed: bool = False,
 ) -> ExitCode:
     """Return pipx exit code."""
 
@@ -198,6 +201,7 @@ def upgrade(
         force=force,
         install=install,
         python=python,
+        python_flag_passed=python_flag_passed,
     )
 
     # Any error in upgrade will raise PipxError (e.g. from venv.upgrade_package())
@@ -212,6 +216,7 @@ def upgrade_all(
     include_injected: bool,
     skip: Sequence[str],
     force: bool,
+    python_flag_passed: bool = False,
 ) -> ExitCode:
     """Returns pipx exit code."""
     venv_error = False
@@ -229,6 +234,7 @@ def upgrade_all(
                 include_injected=include_injected,
                 upgrading_all=True,
                 force=force,
+                python_flag_passed=python_flag_passed,
             )
 
         except PipxError as e:

src/pipx/main.py

@@ -198,10 +198,15 @@ def run_pipx_command(args: argparse.Namespace, subparsers: Dict[str, argparse.Ar
     if "skip" in args:
         skip_list = [canonicalize_name(x) for x in args.skip]
 
-    if "python" in args and args.python is not None:
+    python_flag_passed = False
+
+    if "python" in args:
+        python_flag_passed = bool(args.python)
         fetch_missing_python = args.fetch_missing_python
         try:
-            interpreter = find_python_interpreter(args.python, fetch_missing_python=fetch_missing_python)
+            interpreter = find_python_interpreter(
+                args.python or DEFAULT_PYTHON, fetch_missing_python=fetch_missing_python
+            )
             args.python = interpreter
         except InterpreterResolutionError as e:
             logger.debug("Failed to resolve interpreter:", exc_info=True)
@@ -244,6 +249,7 @@ def run_pipx_command(args: argparse.Namespace, subparsers: Dict[str, argparse.Ar
             include_dependencies=args.include_deps,
             preinstall_packages=args.preinstall,
             suffix=args.suffix,
+            python_flag_passed=python_flag_passed,
         )
     elif args.command == "inject":
         return commands.inject(
@@ -275,6 +281,7 @@ def run_pipx_command(args: argparse.Namespace, subparsers: Dict[str, argparse.Ar
             include_injected=args.include_injected,
             force=args.force,
             install=args.install,
+            python_flag_passed=python_flag_passed,
         )
     elif args.command == "upgrade-all":
         return commands.upgrade_all(
@@ -284,6 +291,7 @@ def run_pipx_command(args: argparse.Namespace, subparsers: Dict[str, argparse.Ar
             skip=skip_list,
             force=args.force,
             pip_args=pip_args,
+            python_flag_passed=python_flag_passed,
         )
     elif args.command == "list":
         return commands.list_packages(
@@ -318,6 +326,7 @@ def run_pipx_command(args: argparse.Namespace, subparsers: Dict[str, argparse.Ar
             local_man_dir=paths.ctx.man_dir,
             python=args.python,
             verbose=verbose,
+            python_flag_passed=python_flag_passed,
         )
     elif args.command == "reinstall-all":
         return commands.reinstall_all(
@@ -327,6 +336,7 @@ def run_pipx_command(args: argparse.Namespace, subparsers: Dict[str, argparse.Ar
             args.python,
             verbose,
             skip=skip_list,
+            python_flag_passed=python_flag_passed,
         )
     elif args.command == "runpip":
         if not venv_dir:
@@ -373,7 +383,6 @@ def add_include_dependencies(parser: argparse.ArgumentParser) -> None:
 def add_python_options(parser: argparse.ArgumentParser) -> None:
     parser.add_argument(
         "--python",
-        default=DEFAULT_PYTHON,
         help=(
             "Python to install with. Possible values can be the executable name (python3.11), "
             "the version to pass to py launcher (3.11), or the full path to the executable."

tests/test_install.py

@@ -350,9 +350,17 @@ def test_passed_python_and_force_flag_warning(pipx_temp_env, capsys):
     captured = capsys.readouterr()
     assert "--python is ignored when --force is passed." in captured.out
 
+    assert not run_pipx_cli(["install", "black", "--force"])
+    captured = capsys.readouterr()
+    assert (
+        "--python is ignored when --force is passed." not in captured.out
+    ), "Should only print warning if both flags present"
+
     assert not run_pipx_cli(["install", "pycowsay", "--force"])
     captured = capsys.readouterr()
-    assert "--python is ignored when --force is passed." not in captured.out
+    assert (
+        "--python is ignored when --force is passed." not in captured.out
+    ), "Should not print warning if package does not exist yet"
 
 
 def test_install_run_in_separate_directory(caplog, capsys, pipx_temp_env, monkeypatch, tmp_path):