如何自动创建变量？

Question

我刚开始与Python和我目前正在制作一个蛇和梯子游戏。 这是我的代码：

    nameList = []
    def players_name():
        x = 0
        input ("""-Press enter to start inputting players' name.
-Press enter after each name inputed to confirm the name to players list.
-After last name inputed, press enter again without any input to finish.""")
        name = input ("Input players' name:")
        while name != "" or len (nameList) <= 1:
            x = x + 1
            if name in nameList:
                print (name,"is already in list, please input a different name.")
                name = input ("")
            elif name =="" and len (nameList) <= 1:
                print ("A minimum of 2 players are require to start the game.")
                name = input ("")
            else:
                nameList.append(name)
                exec("{} = {}".format(name, "1"))
                numList.append("{0}".format (x))
                name = input ("")
        nameList.sort()
        numList.sort()
        print ("There are",len (nameList),"players inputed in your players list!")
        print ("Your players list:",nameList,"\n")

我得到的是：

^{pr2}$

我想弄清楚为什么它没有把“Alvin”声明为一个变量，或者为什么我不能把它打印出来。 我不确定我是否犯了一个愚蠢的错误。在

Answer 1

Keep your data out of your variable names；不要在这里使用exec，而是将你的播放器存储在字典中！在

players = {}

name = input ("Input players' name:")
while name len(players) < 2:
    x = x + 1

    if name in players:
        print (name,"is already in list, please input a different name.")
        name = input ("")
    elif not name and len(players) < 2:
        print ("A minimum of 2 players are require to start the game.")
        name = input ("")
    else:
        players[name] = 1
        numList.append(str(x))
        name = input ("")

nameList = sorted(players.keys())
print ("There are {} players inputed in your players list!".format(len(nameList)))
print ("Your players list:", nameList)

您的代码只将1分配给每个名字；我在这里复制了这一点，在字典中为每个玩家的名字指定了1。你也可以为每个玩家的名字存储其他东西，包括你自己的自定义类的实例。在

Answer 2

这是错误的，你不应该那样做。但如果你有你的理由。。。在

修改exec而不是exec（vor局部作用域变量）或{}（对于全局作用域变量）。在

例如：

locals()["a"] = 5
globals()[<value from user>] = 1

Answer 3

Alvin是列表中的一个元素，如下所示：

 nameList = [`Alvin`, `George` ...]

您应该像这样访问列表中的元素：

^{pr2}$