是否可以使用only Python 3.6.1 Standard Library编写promise个(或多个任务)的序列?
例如,JavaScript中的一个序列写为:
const SLEEP_INTERVAL_IN_MILLISECONDS = 200;
const alpha = function alpha (number) {
return new Promise(function (resolve, reject) {
const fulfill = function() {
return resolve(number + 1);
};
return setTimeout(fulfill, SLEEP_INTERVAL_IN_MILLISECONDS);
});
};
const bravo = function bravo (number) {
return new Promise(function (resolve, reject) {
const fulfill = function() {
return resolve(Math.ceil(1000*Math.random()) + number);
};
return setTimeout(fulfill, SLEEP_INTERVAL_IN_MILLISECONDS);
});
};
const charlie = function charlie (number) {
return new Promise(function (resolve, reject) {
return (number%2 == 0) ? reject(number) : resolve(number);
});
};
function run() {
return Promise.resolve(42)
.then(alpha)
.then(bravo)
.then(charlie)
.then((number) => {
console.log('success: ' + number)
})
.catch((error) => {
console.log('error: ' + error);
});
}
run();
每个函数also returns a Promise具有异步处理结果,该结果将由紧接着的promise 解决/拒绝.
我知道像promises-2.01b
和asyncio 3.4.3
这样的库,我正在寻找Python STL解决方案.因此,如果需要导入非STL库,我更喜欢使用RxPython.