Question

我有这段代码（用于练习）：

def choose_dice():
    while True:
        try:
            dice_quantity = int(input("How many dice would you like to use? "))
            dice_sides = []
            for current_dice in range(1, dice_quantity + 1):
                sides = int(input("How many sides on {} dice? ".format(str(current_dice) + ordinal(current_dice))))
                dice_sides.append([str(current_dice) + ordinal(current_dice) + " dice", sides])
#               print(dice_sides)
            return dice_sides
        except (TypeError, ValueError) as _:
            print("Oops, it seems you have entered a non integer ")

提示用户输入一个数字，然后输入范围内的x（1，数字），提示用户选择一个数字。

如果用户在for循环中键入非整数或没有任何内容，我想返回for循环的当前迭代而不是从头开始。

我怎样才能优雅地实现这一目标？

即当前的行为是这样的：

“你想用多少骰子？3

第一个骰子有多少个？ 6

第二个骰子有多少个？ 0

第3个骰子有多少个？

哎呀，好像你输入了一个非整数

您想要使用多少骰子？ “

如果用户没有输入任何内容，则会在异常中捕获并且整个过程重新开始。我想让它重试当前的“骰子上有多少个方面？”而不是从头开始循环

Answer 1

试试这个：

def choose_dice():
    while True:
        try:
            dice_quantity = int(input("How many dice would you like to use? "))
        except (TypeError, ValueError) as _:
            print("Oops, it seems you have entered a non integer ")

        dice_sides = []
        current_dice = 1
        while current_dice != dice_quantity + 1:
            try:
                sides = int(input("How many sides on {} dice? ".format(str(current_dice) + ordinal(current_dice))))
                dice_sides.append([str(current_dice) + ordinal(current_dice) + " dice", sides])
                current_dice += 1
            except (TypeError, ValueError, NameError) as _:
                print("Oops, it seems you have entered a non integer ")
        print(dice_sides)
        return dice_sides

Answer 2

替换此行：

sides = int(input("How many sides on {} dice? ".format(str(current_dice) + ordinal(current_dice))))

使用此功能：

getSidesOnDice()

这是getSidesOnDice的定义：

def getSidesOnDice():
    while True: 
        try:
            sides = int(input("How many sides on {} dice? ".format(str(current_dice) + ordinal(current_dice))))
            break
        except (TypeError, ValueError) as _: 
            print("Oops, it seems you have entered a non integer ")
    return sides

所以你的代码看起来像这样：

def getSidesOnDice(current_dice):
    while True: 
        try:
            sides = int(input("How many sides on {} dice? ".format(str(current_dice) + ordinal(current_dice))))
            break
        except (TypeError, ValueError) as _: 
            print("Oops, it seems you have entered a non integer ")
    return sides

def choose_dice():
    while True:
        try:
            dice_quantity = int(input("How many dice would you like to use? "))
            dice_sides = []
            for current_dice in range(1, dice_quantity + 1):
                sides = getSidesOnDice(current_dice)
                dice_sides.append([str(current_dice) + ordinal(current_dice) + " dice", sides])
            print(dice_sides)
            return dice_sides
        except (TypeError, ValueError) as _:
            print("Oops, it seems you have entered a non integer ")

您也可以在代码中内联函数。简单的解释是，如果没有获得有效值，则不希望获得current_dice边的行更进一步。因此，最简单的方法是用函数替换它，然后处理函数以使其按预期执行。然后，如果您觉得您希望在主代码中内联函数，请将其放在那里并删除该函数。即使在您的脑海中思考一个功能，也会将任务分解为更容易实现的小部件。

Python：如何“重做”for循环的迭代？

2 个答案: