bpo-46720: Add support for path-like objects to multiprocessing.set_executable for Windows (GH-31279)

This bring the API to be on a par with Unix-like systems.

1 files changed, 11 insertions, 7 deletions

diff --git a/Lib/multiprocessing/spawn.py b/Lib/multiprocessing/spawn.py
index 7cc129e..09f8a22 100644
--- a/Lib/multiprocessing/spawn.py
+++ b/Lib/multiprocessing/spawn.py
@@ -33,18 +33,21 @@ else:
     WINEXE = getattr(sys, 'frozen', False)
     WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")
 
-if WINSERVICE:
-    _python_exe = os.path.join(sys.exec_prefix, 'python.exe')
-else:
-    _python_exe = sys.executable
-
 def set_executable(exe):
     global _python_exe
-    _python_exe = exe
+    if sys.platform == 'win32':
+        _python_exe = os.fsdecode(exe)
+    else:
+        _python_exe = os.fsencode(exe)
 
 def get_executable():
     return _python_exe
 
+if WINSERVICE:
+    set_executable(os.path.join(sys.exec_prefix, 'python.exe'))
+else:
+    set_executable(sys.executable)
+
 #
 #
 #
@@ -86,7 +89,8 @@ def get_command_line(**kwds):
         prog = 'from multiprocessing.spawn import spawn_main; spawn_main(%s)'
         prog %= ', '.join('%s=%r' % item for item in kwds.items())
         opts = util._args_from_interpreter_flags()
-        return [_python_exe] + opts + ['-c', prog, '--multiprocessing-fork']
+        exe = get_executable()
+        return [exe] + opts + ['-c', prog, '--multiprocessing-fork']
 
 
 def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):