age = int(input("請輸入你家狗狗的年齡: "))
print("")
if age <= 0:
    print("你是在逗我吧!")
elif age == 1:
    print("相當于 14 歲的人。")
elif age == 2:
    print("相當于 22 歲的人。")
elif age > 2:
    human = 22 + (age -2)*5
    print("對應人類年齡: ", human)
 
### 退出提示
input("點擊 enter 鍵退出")
----------------------------------------------------------
# 該實例演示了數字猜謎游戲
number = 7
guess = -1
print("數字猜謎游戲!")
while guess != number:
    guess = int(input("請輸入你猜的數字："))
 
    if guess == number:
        print("恭喜，你猜對了！")
    elif guess < number:
        print("猜的數字小了...")
    elif guess > number:
        print("猜的數字大了...")

while 判斷條件(condition)：
    執行語句(statements)……

languages = ["C", "C++", "Perl", "Python"] 
for x in languages:
.. print (x)
... 
C
C++
Perl
Python

for i in range(5):
     print(i)
0
1
2
3
4
你也可以使用range指定區間的值：
for i in range(5,9) :
    print(i)
5
6
7
8
也可以使range以指定數字開始并指定不同的增量(甚至可以是負數，有時這也叫做'步長'):
    for i in range(0, 10, 3) :
    print(i)
    
0
3
6
9
您可以結合range()和len()函數以遍歷一個序列的索引,如下所示:
a = ['Google', 'Baidu', 'Runoob', 'Taobao', 'QQ']
for i in range(len(a)):
...     print(i, a[i])
... 
0 Google
1 Baidu
2 Runoob
3 Taobao
4 QQ

from modname import *