python - 如何使用算术符号而不是内置函数

Question

我正在用 Python 进行数学测验，并使用了 3 个运算符:加法、减法和乘法。我想使用算术运算符，但我发现这很困难，因为如果我只是打印它，python 只是将它读取为一个符号。我使用以下代码:

import random
import operator
opslist = [          # This is the bit that I want to change, i also want 
    operator.add,    # the operators all on one line
    operator.sub,
    operator.mul
]

num1 = random.randint(1,10)  # These are two random numbers for my quiz
num2 = random.randint(1,10)
ops = random.choice(opslist) #Random operator for my quiz

total = (ops(num1,num2))    # Answer for my quiz

print (num1,ops,num2)       # Random question for my quiz

这是输出:

6 <built-in function add> 5

1.) 如何使输出为“6+5”

2.) 另外，我如何让数字只进行小的计算，从而得到肯定的答案，这样问题就永远不会是像“5-8”这样的问题了

Answer 1

我也会在您的代码中使用字典。这就是我所做的。

import random
import operator

opslist= {
    operator.add: "+",    # the operators all on one line
    operator.sub: "-",
    operator.mul: "x"
}

num1 = random.randint(1,10)  # These are two random numbers for my quiz
num2 = random.randint(1,10)
ops = random.choice(list(opslist.keys())) #Random operator from opslist keys

total = (ops(num1,num2)) # Answer for my quiz

print(num1,opslist[ops],num2)

打印问题时，程序会为运算符(operator)打印出符号。为确保您不会得到负数，请在总计下添加:

while total < 0:
    num1 = random.randint(1,10)
    num2 = random.randint(1,10)
    ops = random.choice(opslist)

    total = (ops(num1,num2))