将True / False布尔表达式添加到程序中。 （蟒蛇）

Question

这是我的计划：

import random

def main():
print('Generating 100 random numbers, this program will determine how many are even and how many are odd.')
for count in range(1):
    even = 0
    odd = 0
    for count in range(100):
        numbers = random.randint(1, 100)
        print(numbers)
        if numbers % 2 == 0:
            even += 1
        else:
            odd += 1
print('Out of 100 random numbers,', even, 'are even and', odd, 'are odd.')

main()

基本上，它的作用是打印出100个随机数字并告诉我有多少是偶数，有多少是奇数。该程序运行完美，唯一的问题是我必须使用＆＃34;返回真/假＆＃34;赋值的布尔值表达式。

我知道如果我要这样做，我必须在程序中添加另一个定义函数，但我不知道该怎么做。

有谁知道如何将True / False布尔表达式合并到这个程序中？

Answer 1

制作像

这样的辅助功能

# Longer function, but satisfies the requirements of using True/False and return
def isEven(x):    
    if x % 2 == 0:
        return True
    else:
        return False

然后您可以在main函数

中使用它

for count in range(100):
    numbers = random.randint(1, 100)
    print(numbers)
    if isEven(numbers):  # Notice we're using the helper function here
        even += 1
    else:
       odd += 1

Answer 2

def is_even(x):    
    return not x % 2

"""
An alternate way using explicit True/False
def is_even(x):
    if not x % 2:
        return True
    return False
"""

def count_odds_evens():
    for _ in xrange(100):  # use range if using Python 3.x
        num = random.randint(1, 100)
        print(num)
        if is_even(num):
            even += 1
        else:
            odd += 1
    return even, odd


if __name__ == '__main__':
    evens, odds = count_odds_evens()
    print('Out of 100 random numbers, {} are even and {} are odd.'.format(evens, odds))

稍微更惯用的版本。使用if __name__ == '__main__'允许使用您在其他程序中创建的函数，而无需立即执行它们。

Answer 3

代码应如下所示：

import random
def main():
    even,odd = 0,0
    print('Generating 100 random numbers, this program will determine how many are even and how many are odd.')
    for count in range(100):
        numbers = random.randint(1, 100)
        print(numbers)
        if numbers % 2 == False:
            even += 1
        else:
            odd += 1
"""
 Alternative checking odd in if
 if numbers % 2 == True:
            odd += 1
        else:
            even += 1
"""
    print('Out of 100 random numbers,', even, 'are even and', odd, 'are odd.')

main()