Add new paths to front of PATH

pipenv/vendor/pipdeptree/__main__.py

@@ -7,18 +7,20 @@
 from typing import Sequence
 
 pardir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-# for finding pipdeptree itself
-sys.path.append(pardir)
-# for finding stuff in vendor and patched
-sys.path.append(os.path.dirname(os.path.dirname(pardir)))
+# for finding pipdeptree itself, vendor, and patched
+sys.path = [pardir, os.path.dirname(os.path.dirname(pardir))] + sys.path
 
 from pipenv.vendor.pipdeptree._cli import get_options
 from pipenv.vendor.pipdeptree._detect_env import detect_active_interpreter
 from pipenv.vendor.pipdeptree._discovery import get_installed_distributions
 from pipenv.vendor.pipdeptree._models import PackageDAG
 from pipenv.vendor.pipdeptree._render import render
 from pipenv.vendor.pipdeptree._validate import validate
-from pipenv.vendor.pipdeptree._warning import WarningPrinter, WarningType, get_warning_printer
+from pipenv.vendor.pipdeptree._warning import (
+    WarningPrinter,
+    WarningType,
+    get_warning_printer,
+)
 
 
 def main(args: Sequence[str] | None = None) -> None | int:
@@ -38,7 +40,9 @@ def main(args: Sequence[str] | None = None) -> None | int:
         print(f"(resolved python: {resolved_path})", file=sys.stderr)  # noqa: T201
 
     pkgs = get_installed_distributions(
-        interpreter=options.python, local_only=options.local_only, user_only=options.user_only
+        interpreter=options.python,
+        local_only=options.local_only,
+        user_only=options.user_only,
     )
     tree = PackageDAG.from_pkgs(pkgs)