Update tests.py

tests.py

@@ -288,7 +288,6 @@ def run_code_files(start_cmd:str) -> dict:
 @mcp.tool()
 def run_shell_command(cmd:str) -> dict:
     """(cmd:Example- mkdir test.By default , the command is run inside the /app/code_interpreter/ directory.).Remember, the code_interpreter is running on **alpine linux** , so write commands accordingly.Eg-sudo does not work and is not required.."""
-    global stdout
     run(cmd, 300)
     transfer_files()
     return {"output":stdout}