python - 我想选择一些随机数，但在 Python 中它们的相加应该始终是偶数

Question

import random


for i in range(100):
    a = random.randint(1, 20)
    b = random.randint(1, 20)
    c = random.randint(1, 20)
    if ((a + b + c) % 2) == 0:
        print(str(a) + "," + str(b) + "," + str(c))

我尝试了这个，但没有得到所需的输出。我希望在 1 到 20 之间选择三个随机数，使它们的总和始终为偶数。这里程序只打印输出，即使它没有以这种方式选择数字。希望你能帮助我。谢谢!

Answer 1

检查前两个 (a, b) 之和是偶数还是奇数，然后相应地设置 c 怎么样？

import random


for i in range(100):
    a = random.randint(1, 20)
    b = random.randint(1, 20)
    if (a + b) % 2 == 0:
      c = random.randint(1, 10) * 2
    else:
      c = random.randint(1, 10) * 2 - 1
    if ((a + b + c) % 2) == 0:
        print(str(a) + "," + str(b) + "," + str(c))