在PyQt GUI中嵌入和更新matplotlib图时发生内存泄漏

我正在尝试将每秒更新一次的 matplotlib 图嵌入到 PyQt GUI 主窗口中.

I am trying to embed a matplotlib graph that updates every second into a PyQt GUI main window.

在我的程序中，我通过 timer 函数使用 threading.Timer 每秒调用一次更新函数.我有一个问题:我的程序每秒都在变大 - 以每 4 秒大约 1k 的速度增长.我最初的想法是append函数(在 update_figure 中返回新数组)不会删除旧数组吗?这可能是我遇到问题的原因吗?

In my program I call an update function every second using threading.Timer via the timer function shown below. I have a problem: my program grows bigger every second - at a rate of about 1k every 4 seconds. My initial thoughts are that the append function (that returns a new array in update_figure) does not delete the old array? Is it possible this is the cause of my problem?

def update_figure(self):
    self.yAxis = np.append(self.yAxis, (getCO22()))
    self.xAxis = np.append(self.xAxis, self.i)
    # print(self.xAxis)
    if len(self.yAxis) > 10:
        self.yAxis = np.delete(self.yAxis, 0)

    if len(self.xAxis) > 10:
        self.xAxis = np.delete(self.xAxis, 0)

    self.axes.plot(self.xAxis, self.yAxis, scaley=False)
    self.axes.grid(True)

    self.i = self.i + 1

    self.draw()

这是我的计时器功能 - 这是通过单击我的 PyQt GUI 中的按钮触发的，然后如您所见地调用自身:

This is my timer function - this is triggered by the click of a button in my PyQt GUI and then calls itself as you can see:

def timer(self):
    getCH4()
    getCO2()
    getConnectedDevices()
    self.dc.update_figure()
    t = threading.Timer(1.0, self.timer)
    t.start()

我不能发布我的整个代码，因为它需要包含很多 .dll.所以我会试着解释这个程序的作用.

I cant post my entire code because it requires a lot of .dll includes. So i'll try to explain what this program does.

在我的GUI中，我想显示一段时间内的CO ₂ 值.我的 get_co22 函数只返回一个浮点值，我 100% 确定这可以正常工作.使用我的计时器，如上所示，我想继续将一个值附加到 matplotlib 图 - Axes 对象对我来说是 self.axes.我尝试绘制数据的最后10个值.

In my GUI I want to show the my CO₂ value over time. My get_co22 function just returns a float value and I'm 100% sure this works fine. With my timer, shown above, I want to keep append a value to a matplotlib graph - the Axes object is available to me as self.axes. I try to plot the last 10 values of the data.

经过 http://pastebin.com/RXya6Zah .这将代码的结构更改为将 update_figure()调用为以下代码:

EDIT 2: After some discussion in chat, I tried putting the call to update_figure() in a while loop and using just one thread to call it and was able to make this minimal example http://pastebin.com/RXya6Zah. This changed the structure of the code to call update_figure() to the following:

def task(self):
    while True:
        ui.dc.update_figure()
        time.sleep(1.0)

def timer(self):
    t = Timer(1.0, self.task())
    t.start()

但是现在程序在大约5次迭代后崩溃.

but now the program crashes after 5 iterations or so.