1 """================ if判斷 begin ======================
 2 
 3 # 輸入一個年齡，判斷是成年人還是小孩
 4 age = input('請輸入年齡')
 5 if int(age)>=18:
 6     print('成年人')
 7     exit()
 8 print('小孩')
 9 
10 # 輸入一個數字，判斷是奇數還是偶數
11 num = input('請輸入一個數字')
12 if int(num) % 2 == 0:
13     print('偶數')
14     exit()
15 print('奇數')
 
16 
17 # 輸入一個月份，判斷是哪個季節，python中沒有 && , || ，用 and 或 or 來表示
18 season = int(input('請輸入一個月份：'))
19 if season >=3 and season <=5:
20     print('春季')
21 elif season >=6 and season <=8:
22     print('夏季')
23 elif season >=9 and season <=11:
24     print('秋季')
25 else:
26     print('冬季')
 
27 
28 # 練習
29 小明身高1.75，體重80.5kg。請根據BMI公式（體重除以身高的平方）幫小明計算他的BMI指數，並根據BMI指數：
30 
31 低於18.5：過輕
32 18.5-25：正常
33 25-28：過重
34 28-32：肥胖
35 高於32：嚴重肥胖
36 bmi = 80.5 / pow(1.75,2)
37 if bmi < 18.5:
38     str = '過輕'
39 elif bmi >= 18.5 and bmi < 25:
40     str = '正常'
41 elif bmi >=25 and bmi < 28:
 
42     str = '過重'
43 elif bmi >=28 and bmi < 32:
44     str = '肥胖'
45 else:
46     str = '嚴重肥胖'
47 print(str)
48 
49 =================== if判斷 end ========================"""
50 
51 
52 """=============== for 迴圈 begin ============================
53 
54 name = ['tom','bob','tim']
55 for n in name:
56     print(n)
57     
58 # 用for迴圈計算1-10的和
59 sum = 0
60 nums = [1,2,3,4,5,6,7,8,9,10]
61 for i in nums:
62     sum += i
63 print(sum)
64 
65 # 用for迴圈計算1-100的值，range(x,y)函式用來生成一個大於x，小於y的列表，如果range(z)一個引數的情況下會生成一個大於等於
66 0，小於101的列表
67 sum = 0
68 for i in range(1,101):
69     sum += i
70 print(sum)
71 
72 ================== for 迴圈 end============================"""
73 
74 """=============== while 迴圈 begin =============================
75 
76 # 用while迴圈計算1-10的和
77 i = 1
78 sum = 0
79 while i<=10:
80     sum += i
81     i+=1
82 print(sum)
83 
84 # 用while迴圈逆向輸出10-1
85 num = 10
86 while num>=0:
87     print(num)
88     num = num-1
89     
90 ================== while 迴圈 end ====結束時間：2018:11-23 0:06========================"""