Python範圍問題

Question

我正在寫一個程序，它需要確定數字的範圍，就像我在user_input'a'中放置15一樣，所以它應該打印範圍從'a'到'b'，但不幸的是我是無法解決任何人都可以請幫助我。這是我的代碼：

a = int(raw_input("How many did you say you're going to count down? ")) 
b = int(raw_input("When are you actually going to stop? ")) 
i = 0 
for i in range(a, b): 
    i = i + 1 
    print i 

，我希望它是這樣工作的：

How many did you say you're going to count down? 15 
When are you actually going to stop? 8 
15 
14 
13 
12 
11 
10 
9 
8 

OR

How many did you say you're going to count down? 6 
When are you actually going to stop? 4 
6 
5 
4 

Answer 1

循環可以是：

a = int(raw_input("How many did you say you're going to count down? ")) 
b = int(raw_input("When are you actually going to stop? ")) 

for i in range(a, b-1, -1): 
    print i 

（假設計數減少）。

那你必須知道的是：

1. 的for循環爲你做遞減（無需i = i-1像C）。
2. range(a, b-1, -1)是從a到b-1（未包括）的列表（在Python 2中），步驟爲-1。例如，您可以嘗試在Python shell中執行print range(10, 5, -1)。您還可以檢查range(5, 11, 2)的輸出，以更好地瞭解range()的功能。