Question

我有一个程序有2个非常简单的线程：

一个用于收听串口
一个用于文字用户界面

我的matplotlib也有animation main()。它有scope类，是matplotlib的示例。

当程序开始运行时，它会显示情节，一切正常。问题是，只要用户输入密钥，程序就会崩溃并且python退出时会出现致命错误。

ui主题与matplotlib和scope类无关。如果我删除创建绘图的代码，ui线程没有问题，程序运行顺利。我还注意到我的系统matplotlib使用tkinter来创建窗口。

您对matplotlib animation导致问题的原因有任何提示或经验吗？线程是否可以与matplotlib plot一起使用？

我在Windows7 Python 2.7的命令行窗口中运行此功能。

matplotlib版本：2.0.2 Tkinter版本：8.5

错误：

Fatal Python error: GC object already tracked

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

或者这个错误：

TclStackFree: incorrect freePtr. Call out of sequence?

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

代码：

    import threading
import serial
from matplotlib.lines import Line2D
import matplotlib.pyplot as plt
import matplotlib.animation as animation

class listner(threading.Thread):

        def __init__(self,port):
            threading.Thread.__init__(self)
            self.sport=None
            self.is_running=True
            self.init_port(port)

        def run(self):
            print ' Reading from Port'
            while self.is_running:
                try:
                    self.sport.read(1)
                except:
                    print 'Error reading port'

        def init_port(self,port):
            print '1'
            if self.sport==None or not self.sport.is_open :
                try:

                    self.sport = serial.Serial(port,115200)
                    self.sport.timeout = 1
                    self.sport.reset_input_buffer()
                    self.sport.reset_output_buffer()
                    self.port_open=True
                except:
                    print "    Port error Listener Initing\n",self.port_open,'\n',self.sport
            else:
                pass

        def process(self):
            pass


class ui(threading.Thread):

        def __init__(self):
            threading.Thread.__init__(self)     
            self.running = True

        def run(self):

            print 'Starting UI:\n'
            while self.running:
                print ' Enter input ''S'':\n'
                user = raw_input()



def main(port):

        listner_thread = None
        try:
            listner_thread = listner(port)
            listner_thread.start();
        except:
            print "Listener Thread Failed To Start"
            return

        ui_thread=None
        try:
            ui_thread = ui()
            ui_thread.start()          
        except:
            print "UI Thread Failed To Start"
            return

        run_charts()



def run_charts():
        fig, (ax1, ax2) = plt.subplots(2, 1)

        scope1 = Scope(ax1)
        ani1 = animation.FuncAnimation(fig, scope1.update, emit_ch1, interval=10,blit=True)

        scope2 = Scope(ax2)
        ani2 = animation.FuncAnimation(fig, scope2.update, emit_ch2, interval=10,blit=True)

        plt.show()

def emit_ch1():
    yield 0.001

def emit_ch2():
    yield -0.001

class Scope(object):
        def __init__(self, ax, maxt=2, dt=0.02):
            self.ax = ax
            self.dt = dt
            self.maxt = maxt
            self.tdata = [0]
            self.ydata = [0]
            self.line = Line2D(self.tdata, self.ydata)
            self.ax.add_line(self.line)
            self.ax.set_ylim(-.009, 0.009)
            self.ax.set_xlim(0, self.maxt)

        def update(self, y):
            t = self.tdata[-1] + self.dt
            self.tdata.append(t)
            self.ydata.append(y)
            self.line.set_data(self.tdata, self.ydata)
            return self.line,



if __name__ == '__main__':
        main('COM11')

Answer 1

第一个错误，＆＃34;致命的Python错误：GC对象已经被跟踪＆＃34;于2013年关闭，状态为＆＃34; CLOSED WONTFIX＆＃34;请参阅Bugzilla上的bug report

在2015年[与dask相关]再次提出的临时解决方案似乎是use a single thread使用此代码：

   import dask
   dask.set_options(get=dask.async.get_sync)

但问题实际上存在dataframe.read_csv个问题。

在后来的熊猫版本中问题是eventually solved。如果您升级matplotlib的版本，问题很可能也会通过类似的修复解决。

希望这有帮助

使用matplotlib运行线程会导致python崩溃

1 个答案: