检查是否在组合列表中找到数字组合

Question

我正在用 Python 创建一个模拟乘法闪存卡的程序。我已经走了很远，但我不知道如何不重复数字组合。如何检查一对数字是否已经出现？

from __future__ import division
from itertools import combinations
import random
amountCorrect = 0
amountMissed = 0
comb = combinations([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12], 2)

print("Type 0 at any time to exit and see your score.")
while True:
  firstNumber = random.randint(1,12)
  secondNumber = random.randint(1,12)
  ans = int(input("What is " + str(firstNumber) + " x " + str(secondNumber) + ": "))
  if ans == 0:
    break
  elif ans == firstNumber * secondNumber:
    amountCorrect += 1
  else:
    amountMissed += 1

totalProblems = amountCorrect + amountMissed
percentCorrect = amountCorrect/totalProblems

if .9 < percentCorrect <= 1:
  print("Great job, you are doing awesome!")
elif .7 <= percentCorrect <= .89:
  print("You are doing well,keep it up.")
elif .5 <= percentCorrect <= .69:
  print("You are half way to becoming a master.")
else:
  print("Keeping practicing, you will be a master one day.")

Answer 1

简而言之，使用集合来存储您已经使用过的数字对。这是一些代码。您从不在代码中使用 combinations，所以我将其删除。

from __future__ import division
import random
amountCorrect = 0
amountMissed = 0
highestNumber = 12

print("Type 0 at any time to exit and see your score.")
used = set()
while True:
  if len(used) == highestNumber ** 2:
      break
  while True:
    firstNumber = random.randint(1,highestNumber)
    secondNumber = random.randint(1,highestNumber)
    pair = (firstNumber, secondNumber)
    if pair not in used:
      used.add(pair)
      break
  ans = int(input("What is " + str(firstNumber) + " x " + str(secondNumber) + ": "))
  if ans == 0:
    break
  elif ans == firstNumber * secondNumber:
    amountCorrect += 1
  else:
    amountMissed += 1

totalProblems = amountCorrect + amountMissed
percentCorrect = amountCorrect/totalProblems

if .9 < percentCorrect <= 1:
  print("Great job, you are doing awesome!")
elif .7 <= percentCorrect <= .89:
  print("You are doing well,keep it up.")
elif .5 <= percentCorrect <= .69:
  print("You are half way to becoming a master.")
else:
  print("Keeping practicing, you will be a master one day.")

我刚刚创建了一个名为used 的空集，并添加了一个新的内部循环。该循环测试这对数字是否已被使用。如果是这样，它只是再次循环并尝试一对新的数字。我还添加了一个变量来存储可能的最高数字，并且used 集的测试已满。如果它已满，我会结束测验。没有这个，当所有的可能性都被尝试时，程序将进入一个无限循环。

请注意，此代码将允许1,2 和2,1。如果您只想允许其中一个，请将(firstNumber, secondNumber) 和(secondNumber, firstNumber) 添加到used 集合中。