📝 Update comments and document OS-specific subprocess handling in test script

subprocess_test_2.py

@@ -17,6 +17,7 @@ if __name__ == "__main__":
     result.check_returncode()
     print('return code:', result.returncode)
     print(result.stdout)
+
     print("*" * 100)
     result = subprocess.run(
         ['env'],
@@ -40,7 +41,7 @@ if __name__ == "__main__":
     subprocess.run(
         ['sleep', '5'],
         env=my_env,
-        check=True,  # 非 0 返回时抛出异常
+        check=True,  # 非 0 返回时抛出异常，相当于 result.check_returncode()
     )
 
     print("*" * 100)
@@ -48,7 +49,15 @@ if __name__ == "__main__":
         ['sleep', '50'],
         stdout=subprocess.DEVNULL,
         stderr=subprocess.DEVNULL,
-        preexec_fn=os.setpgrp  # 让子进程独立，即使当前脚本挂了它也继续运行
+        preexec_fn=os.setpgrp  # 让子进程独立，即使当前脚本挂了它也继续运行 for Linux/Unix/MacOS
     )
+    # for Windows
+    # flags = 0x00000008 | 0x00000200
+    # process = subprocess.Popen(
+    #     ["cmd", "/c", "your_script.bat"],
+    #     stdout=subprocess.DEVNULL,
+    #     stderr=subprocess.DEVNULL,
+    #     creationflags=flags
+    # )
 
     print("*" * 100)