Python 单双

Question

我是 python 的新手。我正在尝试编写一个程序来测试数字是否在给定范围之间，然后告诉您数字是奇数还是偶数。 我在检测它是奇数还是偶数的部分遇到问题。 似乎如果它只是重复我的偶数语句。 这是代码：

while True:
    num = int(input("Please enter an integer between 1 and 50: "))
    if num >= 1 and num <= 50:
        for num in range (1, 50):
            if (num % 2 == 0):
                print("Your number is even.")
        else:
            print("Your number is odd.")
        
    else:
        print("Try again. Number must be 1 through 50.")

Answer 1

我认为您根本不需要for循环，并且如果您的内部if-else忘记缩进else部分：

while True:
    num = int(input("Please enter an integer between 1 and 50: "))
    if num >= 1 and num <= 50:
        for num in range (1, 50):  # not needed
            if (num % 2 == 0):
                print("Your number is even.")
            else:  # here
                print("Your number is odd.")
    else:
        print("Try again. Number must be 1 through 50.")

for-else结构存在（并且非常简洁），但是您开始学习 Python，这是另一个故事了。

Answer 2

不，你不需要for循环：

while True:
    num = int(input("Please enter an integer between 1 and 50: "))
    if 1 <= num <= 50:
        if num % 2 == 0:
            print("Your number is even.")
        else:
            print("Your number is odd.")        
    else:
        print("Try again. Number must be 1 through 50.")

Answer 3

我认为你不需要 for 循环，删除 for 循环并重试。

while True:
num = int(input("Please enter an integer between 1 and 50: "))
if num >= 1 and num <= 50:
        if (num % 2 == 0):
            print("Your number is even.")
        else:  # here
            print("Your number is odd.")
else:
    print("Try again. Number must be 1 through 50.")