os.chdir(folder)# based urlurl ="https://physionet.org/physiobank/database/mitdb/"foriinrange(100,235): file_list = i# url of ECG signal head file '*.hea'file_url = url +str(file_list) +'.hea'# save filetry: save_file(file_url)except:continue# discard the empty filesfile_pa...