invalid command name "..._on_timer" in FuncAnimation for (too) small interval

To get a high frame rate for my animation I use a low value for 'interval' for 'FuncAnimation'. If interval is too low p.ex. 10, I get the following Exception, when (and only when) I close the window:

invalid command name "140613997300232_on_timer"
while executing
"140613997300232_on_timer"
("after" script)
Traceback (most recent call last):
File "./monitor.py", line 93, in
plt.show()
File "env/lib/python3.5/site-packages/matplotlib/pyplot.py", line 253, in show
return _show(*args, **kw)
File "env/lib/python3.5/site-packages/matplotlib/backend_bases.py", line 163, in call
manager.show()
File "env/lib/python3.5/site-packages/matplotlib/backends/backend_tkagg.py", line 610, in show
self.canvas.manager.window.attributes('-topmost', 1)
AttributeError: 'NoneType' object has no attribute 'attributes'

matplotlib==2.0.0

https://bugs.launchpad.net/ubuntu/+source/matplotlib/+bug/1666230

Thanks for the bug report! Could you possibly post a minimal example of code (including all the module imports) that triggers this error?

Looks like a race condition tearing down the window (because you closed it) and the timer being fired (only shows up at low interval because you have at catch a timer 'in flight' when you click the 'close' button).

I can reproduce with examples/animation/simple_anim.py with an interval set to 1 and the tkagg backend.

As a side note that example doesn't work at all in the gtk3agg backend:

Traceback (most recent call last):
  File "/home/antony/src/extern/matplotlib/lib/matplotlib/backends/backend_gtk3agg.py", line 69, in on_draw_event
    buf, cairo.FORMAT_ARGB32, width, height)
NotImplementedError: Surface.create_for_data: Not Implemented yet.

@anntzer

@anntzer You need cairocffi for Gtk3Agg + Python 3 to work; you should have got a warning about it.

Ah, yes, I didn't see the warning because it got immediately drowned out by the repeating (due to animation) error message regarding create_for_data.

If it doesn't work without cairocffi, should it be an ImportError?

happens, when I close the matplotlib animation plot.

invalid command name "140609567202440_on_timer"
    while executing
"140609567202440_on_timer"
    ("after" script)

The ultimate cause of this bug was the destruction of the tk canvas occurring before the execution of _on_timer in the Tcl event queue while simultaneously failing to execute after_cancel (can't really explain that). The bug appears to be fixed on master, likely by #17802 or #17789. This issue should be closed if others can reproduce this, however, a new bug has appeared for the smallest values of interval, see #18236.

I get the same error when the blit parameter is True, for a large volume of data

Hi, I got the same error. I am trying to plot real-time values in Tkinter which I obtained from Arduino sensor data. The plots work and everything is working but I get this error shown below. My sensor values contain floating-point values.

Can someone tell me should I fix this issue or just leave it as everything is working fine?

Forex like this
[2.05
1.74
1.65
1.6
1.59
1.59
1.6
1.59
1.58
1.58
1.6]

My error is

invalid command name "1873019790016_on_timer"
while executing
"1873019790016_on_timer"
("after" script)
invalid command name "1873007000832_on_timer"
while executing
"1873007000832_on_timer"
("after" script)

My code looks like this

`style.use('ggplot')
fig = plt.figure(figsize=(15, 6), dpi=60)
ax1 = fig.add_subplot(221)
ax1.set_title("Analog Voltage ")
ax1.set_xlabel("Time")
ax1.set_ylabel(" Analog Voltage")
ax1.set_ylim(-0.5, 5)
line, = ax1.plot(analog_voltage, 'b')


ax2 = fig.add_subplot(222)
ax2.set_title("Voltage")
ax2.set_xlabel("Time")
ax2.set_ylabel(" Voltage")
ax2.set_ylim(-0.5, 5)
line1, = ax2.plot(Voltage, '-r')


ax3 = fig.add_subplot(223)
ax3.set_title("Current")
ax3.set_xlabel("Time")
ax3.set_ylabel(" Current mA")
ax3.set_ylim(-0.5, 3)
line2, = ax3.plot(Current, 'y')


ax4 = fig.add_subplot(224)
ax4.set_title("Temperature")
ax4.set_xlabel("Time")
ax4.set_ylabel(" Temperature °C")
ax4.set_ylim(-10, 80)
line3, = ax4.plot(Temperature, 'r')

Function to append values into the plot

def animate(i):

  line.set_xdata(range(0, len(analog_voltage)))
  line.set_ydata(analog_voltage)
  
  line1.set_xdata(range0, len(Voltage)))
  line1.set_ydata(Voltage)
  
  line2.set_xdata(range(0, len(Current)))
  line2.set_ydata(Current)
  
  line3.set_xdata(range(0, len(Temperature)))
  line3.set_ydata(Temperature)

  ax1.set_xlim(0,i+1)
  ax2.set_xlim(0,i+1)
  ax3.set_xlim(0,i+1)
  ax4.set_xlim(0,i+1)

#plotting the live data
plotcanvas = FigureCanvasTkAgg(fig, root)
plotcanvas.get_tk_widget().pack()
ani = animation.FuncAnimation(fig, animate,interval=1000 ,blit=False)`

@aravindpoolla07

@aravindpoolla07 Can you please open a new issue?

ok sure.

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invalid command name "..._on_timer" in FuncAnimation for (too) small interval #8107

Function to append values into the plot

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invalid command name "..._on_timer" in FuncAnimation for (too) small interval #8107

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voxspox commented on Feb 20, 2017

dstansby commented on Feb 20, 2017

tacaswell commented on Feb 20, 2017

anntzer commented on Feb 20, 2017

QuLogic commented on Feb 21, 2017

anntzer commented on Feb 21, 2017

Robomate commented on Feb 4, 2018

richardsheridan commented on Aug 12, 2020

ffernandoalves commented on Oct 31, 2020

aravindpoolla07 commented on Mar 10, 2022

Function to append values into the plot

tacaswell commented on Mar 10, 2022

aravindpoolla07 commented on Mar 10, 2022

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