福州做网站价格,长沙专业做网络的公司,cms系统排名,目前做汽配的网站有哪些前言
翻出之前做个压测项#xff0c;看到locust中对等待时间的实现方式感到好奇#xff0c;于是总结下来。
源代码实现
def between(min_wait, max_wait):Returns a function that will return a random number between min_wait and max_wait.Example:…前言
翻出之前做个压测项看到locust中对等待时间的实现方式感到好奇于是总结下来。
源代码实现
def between(min_wait, max_wait):Returns a function that will return a random number between min_wait and max_wait.Example::class MyUser(User):# wait between 3.0 and 10.5 seconds after each taskwait_time between(3.0, 10.5)return lambda instance: min_wait random.random() * (max_wait - min_wait)def constant(wait_time):Returns a function that just returns the number specified by the wait_time argumentExample::class MyUser(User):wait_time constant(3)return lambda instance: wait_time可以看到locust中对等待时间的处理是先返回一个匿名函数然后在一个类中 wait_time constant(3)再在task类中调用wait_time()返回一个具体的等待时间
def wait(self):Make the running user sleep for a duration defined by the Locust.wait_timefunction (or TaskSet.wait_time function if its been defined).The user can also be killed gracefully while its sleeping, so calling thismethod within a task makes it possible for a user to be killed mid-task, even if youveset a stop_timeout. If this behaviour is not desired you should make the user wait usinggevent.sleep() instead.if self.user._state LOCUST_STATE_STOPPING:raise StopUser()self.user._state LOCUST_STATE_WAITINGself._sleep(self.wait_time())if self.user._state LOCUST_STATE_STOPPING:raise StopUser()self.user._state LOCUST_STATE_RUNNINGdef _sleep(self, seconds):gevent.sleep(seconds)写法的原理探究
我们先自己仿写一下代码
def call_fuc():return lambda x: print(x)class User:x call_fuc()u User()
u.x() 看到当我们执行的时候就会执行返回的匿名函数的逻辑打印一个类对象
拆解函数
对于不熟悉lambda函数的人来说理解这段函数可能有点绕所以我们拆解一下
def call_fuc():# return lambda x: print(x)def lam(x):print(x)在上面可以看到返回了一个函数给类属性所以x call_fuc(),x就成了一个方法了方法接收一个形参x,接收一个参数x,又是在类里面这不是就是成了一个实例方法吗在类里面我们约定俗成把第一个参数叫做self但是Python本身没有对命名做要求所以在这里x self。重新定义一个实例方法
class User:x call_fuc()def lam(x):print(x)u User()
u.lam()
u.x() 输出结果
