掷骰子模拟器的问题

Question

今天，我正在为骰子模拟器编写一些代码，但是遇到了一个问题。

这是我的代码：

import random
dice = input("""Hello there!
Welcome to the dice roll simulator.
There are three types of dice which you can roll:
a 4 sided dice, a 6 sided dice and a 12 sided dice.
Please enter either 4,6 or 12 depending on which dice you would like to roll.""")

if dice : 4 or 6 or 12
print ("""You have rolled a """, +dice+ """ sided dice, with the result of : """,(random.randrange(1,dice)))

问题是它没有执行（random.randrange（1，dice））计算，而是给我以下错误消息：

Traceback (most recent call last):
  File "C:/Computing science/task 1 code.py", line 9, in <module>
    print ("""You have rolled a """, +roll+ """ sided dice, with the result of : """,(random.randrange(1,dice)))
TypeError: bad operand type for unary +: 'str'

非常感谢您提供有关代码的帮助，

谢谢。

Answer 1

print ("""You have rolled a """, +dice+ """ ... """)
                               ^ you have a spurious comma here,

这会导致Python解释器将+dice解释为一元+运算符，这不适用于字符串。

Answer 2

尝试这个：

import random
dice = input("""Hello there!
Welcome to the dice roll simulator.
There are three types of dice which you can roll:
a 4 sided dice, a 6 sided dice and a 12 sided dice.
Please enter either 4,6 or 12 depending on which dice you would like to roll.""")

if dice in (4 ,6,12) :
    print ("""You have rolled a """, dice, """ sided dice, with the result of : """,(random.randrange(1,dice)))

Answer 3

首先，您需要将用户输入（ str类型）转换为数字。 其次，您应该期望输入可能是错误的（例如，字母而不是数字）。 最后，使用字符串替换（通过.format()方法）比连接字符串更好-它更快，更易读并且更容易使用不同类型的变量。

import random
try:
    dice = int(input("...message...:"))
    if dice in (4, 6, 12):
        print ("You have rolled a {}-sided dice, with the result of : {}".format(
            dice, random.randint(1, dice)))
    else:
        raise ValueError
except ValueError:
    print ("Wrong value for dice.")