python | 变量与数据 | 数据类型

 1 # coding: utf-8
 2 
 3 a = 3434
 4 b = 456787654567876545678765456767687878
 5 price = 32.43
 6 name = ‘marry‘
 7 
 8 # 输出数据类型
 9 print(type(a))
10 print(type(b))
11 print(type(price))
12 print(type(name))
13 
14 # str转换为int
15 # str中只能是阿拉伯数字，不能含有小数点
16 math_grade = int(input(‘请输入数学成绩：‘))
17 english_grade = int(input(‘请输入英语成绩：‘))
18 total = math_grade + english_grade
19 print(‘总成绩为：%s‘ % total)
20 print(type(total))
21 
22 # float转换为int
23 # 只保留小数点前面的
24 f = 43.65
25 i = int(f)
26 print(i)
27 print(type(i))
28 
29 # int和float转换为str
30 f = 23.54
31 i = 343
32 s = str(f)
33 print(s)
34 print(type(s))
35 s = str(i)
36 print(s)
37 print(type(s))
38 
39 # int和str转换为float
40 i = 89
41 s = ‘789.45‘
42 f = float(i)
43 print(f)
44 print(type(f))
45 f = float(s)
46 print(f)
47 print(type(f))