1 age = 6
2 if age>=18:
3 print('Your age is ',age)
4 print('adult')
5 elif age>=6:
6 print('Your age is ',age)
7 print('teenager')
8 else:
9 print('kid')
10
11 #只要x是非零数值、非空字符串、非空list等，就判断为True，否则为False。
12 x1 = 1
13 if x1:
14 print('Good_1')
15 else:
16 print('bad_1')
17
18 x2 = 'a'
19 if x2:
20 print('Good_2')
21 else:
22 print('bad_2')
23
24 x3 =[1,2]
25 if x3:
26 print('Good_3')
27 else:
28 print('bad_3')
29
30 x4 = []
31 if x4:
32 print('Good_4')
33 else:
34 print('bad_4')
35
36 x5 = 0
37 if x5:
38 print('Good_5')
39 else:
40 print('Bad_5')
41
42 x6 = ''
43 if x6:
44 print('Good_6')
45 else:
46 print('Bad_6')
47
48 x7 = ()
49 if x7:
50 print('Good_7')
51 else:
52 print('Bad_7')
53
54
55 # #input()
56 # birth = int(input('Enter your birth:'))
57 # # birth = input('Enter your birth:') #TypeError: '>' not supported between instances of 'str' and 'int'
58 # if birth>2000:
59 # print('00后')
60 # else:
61 # print('00前')
62 '''
63 小明身高1.75，体重80.5kg。请根据BMI公式（体重除以身高的平方）帮小明计算他的BMI指数，并根据BMI指数：
64
65 低于18.5：过轻
66 18.5-25：正常
67 25-28：过重
68 28-32：肥胖
69 高于32：严重肥胖
70
71 用if-elif判断并打印结果：
72 '''
73 height = float(input('Enter your height: '))
74 weight = float(input('Enter your weight: '))
75 BMI = weight/(height*height)
76 if BMI<18.5:
77 print('过轻')
78 if 18.5<=BMI<25:
79 print('正常')
80 if 25<=BMI<28:
81 print('过重')
82 if 28<=BMI<32:
83 print('肥胖')
84 if BMI>=32:
85 print('严重肥胖')
86
87 # 低于18.5：过轻
88 # 18.5-25：正常
89 # 25-28：过重
90 # 28-32：肥胖
91 # 高于32：严重肥胖
