testfolder/torch.py

import os

def run_bash():
    res = os.system("ls -la")
    print(res)
    

if __name__ == '__main__':
    run_bash()
    

if __name__ == '__main__':
    import pickle
    
    class Vuln():
        def __reduce__(self):
            #  return (os.system, ("echo 'I should have been stopped by the hook'",))
            return (run_bash, ()) 
    
    with open("vuln.pkl", "wb") as f:
        pickle.dump(Vuln(), f)