python(二)——if条件语句与基本数据类型

if语句

缩进要保持一致

 if 1 == 1:
     print('hello')
     if 2 == 2:
         print('world')
 else:
     print('python')

elif

 inp = input('请输入等级')

 if inp == 'h':
     print('high')
 elif inp == 'm':
     print('mid')
 else:
     print('low')
 print('final')

pass什么也不做

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

数据类型：

 #字符串加法
 n1 = "hello "
 n2 = "world"
 n3 = n1 + n2
 print(n3)

 #字符串乘法
 n4 = 10 * n1    # n4 = hello hello hello ...
 print(n4)

 #数字
 a1 = 13
 a2 = 10;

 a3 = a1 + a2
 print(a3)

 a4 = 2 ** 4 #2的4次方
 print(a4)

 a5 = a1 % 2
 a6 = a1 / 2
 a7 = a1 // 2

 print(a5)    #
 print(a6)    #    6.5
 print(a7)    #