Add list to dict in do_install

install.py

@@ -7,7 +7,7 @@ Shamelessly copied from https://github.com/dmerejkowsky/dotfiles.
 
 import argparse
 import subprocess
-from typing import List, Optional
+from typing import Dict, List, Optional, Tuple
 from urllib.request import urlretrieve
 
 import cli_ui as ui  # type: ignore
@@ -108,14 +108,13 @@ class Installer:
     def do_install(self, *packages, **os_specific_packages) -> None:
         """Install packages with OS-specific package manager.
 
-        Packages can either be in a list for non OS-specific packages, or in a
+        Packages can either be in a tuple for non OS-specific packages, or in a
         dict for OS-specific packages.
         """
 
         if not packages:  # we got the dict, make a list out of it
             try:
-                packages = os_specific_packages[self.operating_system].split()\
-                         + os_specific_packages["both"].split()
+                packages = os_specific_packages[self.operating_system] + os_specific_packages["both"]
             except KeyError:
                 ui.fatal("Operating System not understood.")
                 return