1.看不懂的童鞋试着把所有的yeild from去掉就好理解了。
aiomysql provides same api you just need to use yield from conn.f() instead of just call conn.f() for every method.
这个Pool和SQL语句的定义基本是官方的例子写法。
看这里：
http://aiomysql.readthedocs.org/en/latest/index.html
2.yield from是一个新特性，它允许
yield from <expr>
作为一个表达式放到任意的generator内。
当这个<expr> 也是一个generator时，yield from 会接收他的返回值。
when the iterator is another generator, the subgenerator is allowed to execute a return statement with a value, and that value becomes the value of the yield from expression.
小小手冰冰1782475904
1.看不懂的童鞋试着把所有的yeild from去掉就好理解了。 aiomysql provides same api you just need to use yield from conn.f() instead of just call conn.f() for every method. 这个Pool和SQL语句的定义基本是官方的例子写法。 看这里： http://aiomysql.readthedocs.org/en/latest/index.html
2.yield from是一个新特性，它允许
作为一个表达式放到任意的generator内。 当这个<expr> 也是一个generator时，yield from 会接收他的返回值。
when the iterator is another generator, the subgenerator is allowed to execute a return statement with a value, and that value becomes the value of the yield from expression.
看这里： https://www.python.org/dev/peps/pep-0234/
3.先安装PyMySQL,再安装aiomysql，import的时候会报错，卸载PyMySQL后再装一下aiomysql就好了。aiomysql requires PyMySQL library.安装的时候会同时自动安装PyMySQL.