[py] do not check sys.platform if setting environment variable

py/selenium/webdriver/common/selenium_manager.py

@@ -40,18 +40,23 @@ def get_binary() -> Path:
 
         :Returns: The Selenium Manager executable location
         """
-        directory = "linux"
+
         file = "selenium-manager"
         if os.getenv("SE_MANAGER_PATH"):
-            directory = os.getenv("SE_MANAGER_PATH")
-            file = ""
-        if sys.platform == "darwin":
-            directory = "macos"
-        elif sys.platform in ("win32", "cygwin"):
-            directory = "windows"
-            file = "selenium-manager.exe"
-
-        path = Path(__file__).parent.joinpath(directory, file)
+            path = os.getenv("SE_MANAGER_PATH")
+        else:
+            platform = sys.platform
+
+            dirs = {
+                "darwin": "macos",
+                "win32": "windows",
+                "cygwin": "windows",
+            }
+
+            directory = dirs.get(platform) if dirs.get(platform) else platform
+            file = "selenium-manager.exe" if directory == "windows" else "selenium-manager"
+
+            path = Path(__file__).parent.joinpath(directory, file)
 
         if not path.is_file() and os.environ["CONDA_PREFIX"]:
             # conda has a separate package selenium-manager, installs in bin