将正输入转换为负数

Question

start = int(input("Please enter starting number"))
end = int(input("Please enter ending number"))
amount = int(input("Please enter the amount to count"))

for i in range(start,end,amount):
    print(i)

I want the number from the amount variable to be converted into a negative number so that I can reverse range() .

Answer 1

You want to negate it only if the start is greater than the end.

if start > end:
    amount = -amount

Or you can tuck that right into the range() call:

for i in range(start, end, -amount if start > end else amount):

Answer 2

我不确定这是否是您真正想要的，但是要将金额转换为负数，您只需键入以下内容：

amount = amount * -1