umwandeln kann nicht ‚schweben‘ Objekt implizit auf str [Loggin]

Question

Ich versuche, einige Informationen zu speichern und erhalte ich die Fehler
„Kann nicht‚schweben‘Objekt konvertieren implizit auf str“ I str wurde mit (statt Format), aber es zeigte der gleiche Fehler Bitte helfen thx.

def save_model(json_string, dirpath='results/'): 
    with open(dirpath + starttime +'.txt', 'w') as f: 
     f.write(json_string) 

def save_config(config, dirpath='results/'): 
    with open(dirpath + 'config_log.txt', 'a') as f: 
     f.write(starttime + '\n') 
     f.write((config) + '\n') 

def save_result(starttime, conv_arch, dense, train_acc, val_acc, dirpath='results/'): 
    with open(dirpath + starttime +'_train_val.txt', 'w') as f: 
     f.write("{0}".format(train_acc) + '\n') 
     f.write("{0}".format(val_acc) + '\n') 

    endtime = time.asctime(time.localtime(time.time())) 
    with open(dirpath + 'result_log.txt', 'a') as f: 
     f.write(starttime + '--' + endtime + ' comment: ' + notes + '\n') 
     f.write("{0}".format(conv_arch) + ',{0}'.format(dense) + '\n') 
     f.write('Train acc: {0}'.format(train_acc[-1]) + 
      'Val acc: {0}'.format(val_acc[-1]) + 
      'Ratio: {0}'.format(val_acc[-1]/train_acc[-1]) + '\n') 

hier ist der Ausgang

 INFO - File "cnn6.py", line 109, in cnn_architecture 
    INFO - dropout, X_shape, y_shape, train_acc, val_acc, dirpath) 
    INFO - File "cnn6.py", line 33, in logging 
    INFO - save_result(starttime, conv_arch, dense, train_acc, val_acc, now) 
    INFO - File "/code/log.py", line 20, in save_result 
    INFO - with open(dirpath + starttime +'_train_val.txt', 'w') as f: 
    INFO - TypeError: Can't convert 'float' object to str implicitly