python--字符串

str = "hello jiao";


# 从索引0开始到index=-1之前（包含index=0不包含index=-1【index=-1是字符串最后一个字符】）
print(str[0: -1]);
# hello jia



# 从索引0开始到index=4之前（包含index=0不包含index=4）
print(str[0: 4]);
print(str[: 4]);
# hell



# 从索引6开始到结尾（包含index=6）
print(str[6: ]);
# jiao



# 输出两次字符串
print(str * 2);



# 字符串拼接
print(str[0: 5] + "  world!!!");

str = "hello";

str += " jiao";
print(str);     #hello jiao

str = "jiao";
print(str);   #jiao

print("""
    <meta charset="utf-8" />
        <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>

        <link rel="stylesheet" href="//cdn.bootcss.com/uikit/2.25.0/css/uikit.css" />
        <script src="//cdn.bootcss.com/uikit/2.25.0/js/uikit.js"></script>

        <link href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
        <script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>

        <link rel="stylesheet" href="css/global.css">
        <link rel="stylesheet" href="css/index.css">

        <script src="js/main.js"></script>
""");