python(二)——if条件语句与基本数据类型

if语句

缩进要保持一致

1 if 1 == 1:
2     print('hello')
3     if 2 == 2:
4         print('world')
5 else:
6     print('python')

elif

1 inp = input('请输入等级')
2 
3 if inp == 'h':
4     print('high')
5 elif inp == 'm':
6     print('mid')
7 else:
8     print('low')
9 print('final')

pass什么也不做

1 #!/usr/bin/env python
2 #-*- coding:utf8 -*-
3 if 1 == 1:
4     pass
5 else:
6     print('1 == 1')

数据类型：

 1 #字符串加法
 2 n1 = "hello "
 3 n2 = "world"
 4 n3 = n1 + n2
 5 print(n3)
 6 
 7 #字符串乘法
 8 n4 = 10 * n1    # n4 = hello hello hello ... 
 9 print(n4)
10 
11 #数字
12 a1 = 13
13 a2 = 10;
14 
15 a3 = a1 + a2
16 print(a3)
17 
18 a4 = 2 ** 4 #2的4次方
19 print(a4)
20 
21 a5 = a1 % 2
22 a6 = a1 / 2
23 a7 = a1 // 2
24 
25 print(a5)    #    1
26 print(a6)    #    6.5
27 print(a7)    #    6