我收到FileNotFoundError：[错误2]没有这样的文件或目录：'user.txt'。我怎么称呼它呢？

users = open('user.txt','r')
userInfo = users.readlines()

accessOne = False
accessTwo = False

while accessOne == False:
    username = input('Username: ')

    for line in userInfo:

        if line.split(' ')[0].strip(',') == username:
            accessOne = True

            while accessTwo == False:
                password = input('Password: ')

                if line.split(' ')[1].strip('\n') == password:
                    accessTwo = True
                    break

                else:
                    accessTwo = False
                    print('Incorrect password, please try again.')
                    continue
        else:
            accessOne = False
            continue
        break