未定义'NameError'test'。 我要去哪里错了？

Question

I am using Python 2.7 and am trying to get my program to check if a file exists and if it does, the program should then ask the user if they want to overwrite it. If the file is not there, a new one should be created. These two steps are repeated where the file is found to be existing. Here is the code:

import os.path
file_name = input("Please enter the name of the file to save your data       to: Example: test.txt ")
file_open = open(file_name, "w")
if os.path.isfile(file_name):
    print ("File exists")
    decide = input("Do you want to overwrite the file?, Yes or No")
    control = True
    while control:
        if decide != "Yes":
            file_name = input("Please enter the name of the file to save your data to: Example: test.txt ")
            if os.path.isfile(file_name):
                print ("File exists")
        else:
            newFile = open(file_name, "w")
            newFile.write(str(model))
            newFile.close()
            control=False
else:
    print("Creating a new file..................")
    file_open.write(str(model))
    file_open.close()

Answer 1

在第2、6和10行中，在读取字符串并检查代码缩进时，它应该是raw_input（）。