将字典保存到文本文件python 3

我正在尝试完成大学作业，将字典保存到文本文件。这是保存功能，使用我的讲师提供的相同公式：

def saveData(orders):
    
    filename = input("Filename to save: ")
    
    print("Saving data...")
    
    outFile = open(filename, "wt")
    
    for x in orders.keys():
        order = orders[x].getorder()
        amount = orders[x].getamount()
        name = str(orders[x].getname())
        outFile.write(order + "," + amount + "," + name + "\n")

这是错误：

 File "main.py", line 49, in saveData                                                                                                                                                 
    outFile.write(order + "," + amount + "," + name + "\n")                                                                                                                            
TypeError: unsupported operand type(s) for +: 'int' and 'str'