Python 如何将数字转换为符号（数学）

Question

我正在尝试使用两个随机数 (1, 10) 随机选择和、差或积来进行数学测验。我使用 z = random.randint(1, 3) 生成和、差或乘积，但我想使用此数字转换为 "x"、“/”或“+”等符号来显示输出以提问，因为我是新手Python 语言，我正在尝试学习如何将数字转换为符号。

我的代码在这里：

import random

def askNum():
  while(1):
    try:
      userInput = int(input("Enter a number: "))
      break
    except ValueError:
      print("Incorrect Input!")

  return userInput

def askQuestion():
  x = random.randint(1, 10)
  y = random.randint(1, 10)
  z = random.randint(1, 3)

  print(" 1 = product \n 2 = sum \n 3 = difference")
  print("What is " + str(x)+" " + str(z)+" " + str(y)+"?")

  u = askNum()
  if z == 1 and u==x*y:
    return 1  #product
  elif z == 2 and u==x+y:
    return 1 #sum
  elif z == 3 and u==x/y:
    return 1 #difference
  else:
    return 0
amount = 10
correct = 0
for i in range(amount):
  correct += askQuestion()

print("You got %d correct out of %d" % (correct, amount))

现实输出：

dm15125@isu:/u1/work/Python/math> python3 mathquiz.py
 1 = product
 2 = sum
 3 = difference
What is 4 2 6?
Enter a number: 10
 1 = product
 2 = sum
 3 = difference
What is 7 2 6?
Enter a number: 13
 1 = product
 2 = sum
 3 = difference
What is 3 2 3?
Enter a number: 6
 1 = product
 2 = sum
 3 = difference
What is 8 3 4?
Enter a number: 2
 1 = product
 2 = sum
 3 = difference
What is 8 3 10?
Enter a number: 0.8
Incorrect Input!
Enter a number: .8
Incorrect Input!
Enter a number: 0
 1 = product
 2 = sum
 3 = difference
What is 2 2 6?
Enter a number: 8
 1 = product
 2 = sum
 3 = difference
What is 6 3 4?
Enter a number: 1.5
Incorrect Input!
Enter a number: 2
 1 = product
 2 = sum
 3 = difference
What is 7 1 10?
Enter a number: 70
 1 = product
 2 = sum
 3 = difference
What is 9 2 5?
Enter a number: 14
 1 = product
 2 = sum
 3 = difference
What is 5 1 10?
Enter a number: 50
You got 8 correct out of 10

预期输出：

dm15125@isu:/u1/work/Python/math> python3 mathquiz.py
What is 4 + 6?
Enter a number: 10
What is 7 + 6?
Enter a number: 13
What is 3 + 3?
Enter a number: 6
What is 8 / 4?
Enter a number: 2
What is 8 / 10?
Enter a number: 0.8
Incorrect Input!
Enter a number: .8
Incorrect Input!
Enter a number: 0
What is 2 + 6?
Enter a number: 8
What is 6 / 4?
Enter a number: 1.5
Incorrect Input!
Enter a number: 2
What is 7 * 10?
Enter a number: 70
What is 9 + 5?
Enter a number: 14
What is 5 * 10?
Enter a number: 50
You got 8 correct out of 10

Answer 1

你可以使用字典来做到这一点：

operators = {
   1: "+",
   2: "-",
   3: "/",
   4: "*"
}
operators = operator[z] // where z is the random integer for gettig the operator.

在你的打印语句中

print("What is " + str(x)+" " + str(operator)+" " + str(y)+"?")

Answer 2

在这部分代码中：

print(" 1 = product \n 2 = sum \n 3 = difference")
print("What is " + str(x)+" " + str(z)+" " + str(y)+"?")

而不是 str(z)，定义一个类似 ops = ['*', '+', '-'] 的列表并使用 ops[z - 1]。 - 1 是因为你的 z 从 1 开始，但数组索引从零开始。所以你的函数会变成：

def askQuestion():
    ops = ['*', '+', '-']
    x = random.randint(1, 10)
    y = random.randint(1, 10)
    z = random.randint(1, 3)

    print(" 1 = product \n 2 = sum \n 3 = difference")
    print("What is " + str(x) + " " + ops[z - 1] + " " + str(y) + "?")

    u = askNum()
    if z == 1 and u==x*y:
        return 1  #product
    elif z == 2 and u==x+y:
        return 1 #sum
    elif z == 3 and u==x/y:
        return 1 #difference
    else:
        return 0

Answer 3

您可以在 askQuestion 函数中使用“if”语句来选择要打印的符号。

或者使用像这样的列表：

symbols_list = ['*','+','-']

symbols_list[z-1]

然后使用“z”值对其进行索引（请记住，第一个位置的索引是 0 而不是 1）。

或者使用以“z”为键的字典来检索适当的符号：

symbols_dict = {1:'*', 2:'+',3:'-'}

symbols_dict[z]

如你所见，有很多选项，选择你更喜欢的一个即可。

Python 如何将数字转换为符号（数学）

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