获取我已经在 python 中读取的字节数的百分比

如何解决获取我已经在 python 中读取的字节数的百分比

我写了这段代码，它应该给我已经从文件中读取的字节数的百分比，感谢 appjar。但是，当我尝试设置栏的值时，它从 0 到 190%，这显然不是我想要的。有人能告诉我错误在哪里吗？

def apriCsv():
 path = app.openBox(title="Apri File",dirName=None,fileTypes=[("File CSV","*.csv")],asFile=False,parent=None,multiple=False,mode='r')

 size = os.path.getsize(path)
 percentuale = 100.0/size
 letto = 0
 line = ""

 with open(path) as file:
        
        reader = csv.reader(file,delimiter=',')
        
        for riga in reader:

            for i in riga:  #create a string made out of all the element in riga
                    line += i 
           
            letto += len(line.encode('utf-8'))  #get the size in bytes of the string
            app.setMeter("progress",percentuale * letto,percentuale*letto ) #set the value of the bar 
            if riga != ["TITOLO","DESCRIZIONE","PREZZO"]:
                elencoLibri.append(Libro(riga[0],riga[1],riga[2]))
                app.addTableRow("elencoLibri",riga)