Question

我的问题是我有多个def语句登录注册骰子。我试图从注册语句到骰子语句调用变量，但它说用户名在定义时未定义。

def register():# registers users
    myfile = open ('User names.csv','a+')
    print('\n~~Registration~~\n\n')
    username = input('Enter your username\n')
    password = input('Enter your password\n')
    new_data = username+','+password
    myfile.write (str(new_data))

def dice():
    player_1_username = username

它说未定义名称“用户名”

Answer 1

变量username仅用于注册函数，不能在dice函数中访问。您必须将username传递给dice函数作为参数，或者将username设置为函数外部的全局变量才能访问它。

Answer 2

我认为您应该将'username'变量设为全局变量。

   global username
   username = input()

Answer 3

然后尝试：

  def register():# registers users
            myfile = open ('User names.csv','a+')
            print('\n~~Registration~~\n\n')
            username = input('Enter your username\n')
            password = input('Enter your password\n')
            new_data = username+','+password
            myfile.write (str(new_data))
            return username

  def dice():
            player_1_username = register()
  dice() #you must call the function too

语法错误名称“用户名”未定义python 3

3 个答案: