Is there a way to detach matplotlib plots so that the computation can continue

Question

After these instructions in the Python interpreter one gets a window with a plot   from matplotlib pyplot import   plot  1 2 3   show     other code   Unfortunately  I don t know how to continue to interactively explore the figure created by show   while the program does further calculations   Is it possible at all  Sometimes calculations are long and it would help if they would proceed during examination of intermediate results

User · Accepted Answer

Use matplotlib s calls that won t block  Using draw    from matplotlib pyplot import plot  draw  show plot  1 2 3   draw   print  continue computation      at the end call show to ensure window won t close  show    Using interactive mode  from matplotlib pyplot import plot  ion  show ion     enables interactive mode plot  1 2 3     result shows immediatelly  implicit draw     print  continue computation      at the end call show to ensure window won t close  show

User · Answer

Use plt show block False   and at the end of your script call plt show     This will ensure that the window won t be closed when the script is finished

User · Answer

It is better to always check with the library you are using if it supports usage in a non-blocking way   But if you want a more generic solution  or if there is no other way  you can run anything that blocks in a separated process by using the multprocessing module included in python  Computation will continue   from multiprocessing import Process from matplotlib pyplot import plot  show  def plot graph  args       for data in args          plot data      show    p   Process target plot graph  args   1  2  3     p start    print  yay  print  computation continues     print  that rocks    print  Now lets wait for the graph be closed to continue      p join     That has the overhead of launching a new process  and is sometimes harder to debug on complex scenarios  so I d prefer the other solution  using matplotlib s nonblocking API calls

User · Answer

In my case  I wanted to have several windows pop up as they are being computed  For reference  this is the way   from matplotlib pyplot import draw  figure  show f1  f2   figure    figure   af1   f1 add subplot 111  af2   f2 add subplot 111  af1 plot  1 2 3   af2 plot  6 5 4   draw    print  continuing computation  show     PS  A quite useful guide to matplotlib s OO interface

User · Answer

If you want to open multiple figures  while keeping them all opened  this code worked for me   show block False  draw

User · Answer

If you are working in console  i e  IPython you could use plt show block False  as pointed out in the other answers  But if you re lazy you could just type   plt show 0    Which will be the same

User · Answer

In my opinion  the answers in this thread provide methods which don t work for every systems and in more complex situations like animations  I suggest to have a look at the answer of MiKTeX in the following thread  where a robust method has been found   How to wait until matplotlib animation ends

User · Answer

Use the keyword  block  to override the blocking behavior  e g    from matplotlib pyplot import show  plot  plot 1    show block False     your code   to continue your code

User · Answer

It is better to always check with the library you are using if it supports usage in a non-blocking way   But if you want a more generic solution  or if there is no other way  you can run anything that blocks in a separated process by using the multprocessing module included in python  Computation will continue   from multiprocessing import Process from matplotlib pyplot import plot  show  def plot graph  args       for data in args          plot data      show    p   Process target plot graph  args   1  2  3     p start    print  yay  print  computation continues     print  that rocks    print  Now lets wait for the graph be closed to continue      p join     That has the overhead of launching a new process  and is sometimes harder to debug on complex scenarios  so I d prefer the other solution  using matplotlib s nonblocking API calls

User · Answer

If you are working in console  i e  IPython you could use plt show block False  as pointed out in the other answers  But if you re lazy you could just type   plt show 0    Which will be the same

User · Answer

IMPORTANT  Just to make something clear  I assume that the commands are inside a  py script and the script is called using e g  python script py from the console   A simple way that works for me is    Use the block   False inside show   plt show block   False   Use another show   at the end of the  py script      Example of script py file   plt imshow  something                                                                  plt colorbar                                                                                plt xlabel  true                                                                       plt ylabel  predicted                                                                  plt title   the matrix        Add block   False                                            plt show block   False                                      OTHER CALCULATIONS AND CODE HERE                                           the next command is the last line of my script plt show

User · Answer

I also wanted my plots to display run the rest of the code  and then keep on displaying  even if there is an error  I sometimes use plots for debugging   I coded up this little hack so that any plots inside this with statement behave as such   This is probably a bit too non-standard and not advisable for production code  There is probably a lot of hidden  gotchas  in this code   from contextlib import contextmanager   contextmanager def keep plots open keep show open on exit True  even when error True               To continue excecuting code when plt show   is called     and keep the plot on displaying before this contex manager exits      even if an error caused the exit               import matplotlib pyplot     show original   matplotlib pyplot show     def show replacement  args    kwargs           kwargs  block     False         show original  args    kwargs      matplotlib pyplot show   show replacement      pylab exists   True     try          import pylab     except ImportError           pylab exists   False     if pylab exists          pylab show   show replacement      try          yield     except Exception  err          if keep show open on exit and even when error              print                                                             print  Error early edition while waiting for show                  print                                                             import traceback             print traceback format exc               show original               print                                                             raise     finally          matplotlib pyplot show   show original         if pylab exists              pylab show   show original     if keep show open on exit          show original                                Running example                           import pylab as pl import time if   name         main         with keep plots open            pl figure  a           pl plot  1 2 3    4 5 6                pl plot  3 2 1    4 5 6           pl show            pl figure  b           pl plot  1 2 3    4 5 6           pl show            time sleep 1          print               time sleep 1          print               time sleep 1          print               this will surely cause an error   If when I implement a proper  keep the plots open  even if an error occurs  and allow new plots to be shown   I would want the script to properly exit if no user interference tells it otherwise  for batch execution purposes    I may use something like a time-out-question  End of script   nPress p if you want the plotting output to be paused  you have 5 seconds     from https   stackoverflow com questions 26704840 corner-cases-for-my-wait-for-user-input-interruption-implementation

User · Answer

I also wanted my plots to display run the rest of the code  and then keep on displaying  even if there is an error  I sometimes use plots for debugging   I coded up this little hack so that any plots inside this with statement behave as such   This is probably a bit too non-standard and not advisable for production code  There is probably a lot of hidden  gotchas  in this code   from contextlib import contextmanager   contextmanager def keep plots open keep show open on exit True  even when error True               To continue excecuting code when plt show   is called     and keep the plot on displaying before this contex manager exits      even if an error caused the exit               import matplotlib pyplot     show original   matplotlib pyplot show     def show replacement  args    kwargs           kwargs  block     False         show original  args    kwargs      matplotlib pyplot show   show replacement      pylab exists   True     try          import pylab     except ImportError           pylab exists   False     if pylab exists          pylab show   show replacement      try          yield     except Exception  err          if keep show open on exit and even when error              print                                                             print  Error early edition while waiting for show                  print                                                             import traceback             print traceback format exc               show original               print                                                             raise     finally          matplotlib pyplot show   show original         if pylab exists              pylab show   show original     if keep show open on exit          show original                                Running example                           import pylab as pl import time if   name         main         with keep plots open            pl figure  a           pl plot  1 2 3    4 5 6                pl plot  3 2 1    4 5 6           pl show            pl figure  b           pl plot  1 2 3    4 5 6           pl show            time sleep 1          print               time sleep 1          print               time sleep 1          print               this will surely cause an error   If when I implement a proper  keep the plots open  even if an error occurs  and allow new plots to be shown   I would want the script to properly exit if no user interference tells it otherwise  for batch execution purposes    I may use something like a time-out-question  End of script   nPress p if you want the plotting output to be paused  you have 5 seconds     from https   stackoverflow com questions 26704840 corner-cases-for-my-wait-for-user-input-interruption-implementation

User · Answer

It is better to always check with the library you are using if it supports usage in a non-blocking way   But if you want a more generic solution  or if there is no other way  you can run anything that blocks in a separated process by using the multprocessing module included in python  Computation will continue   from multiprocessing import Process from matplotlib pyplot import plot  show  def plot graph  args       for data in args          plot data      show    p   Process target plot graph  args   1  2  3     p start    print  yay  print  computation continues     print  that rocks    print  Now lets wait for the graph be closed to continue      p join     That has the overhead of launching a new process  and is sometimes harder to debug on complex scenarios  so I d prefer the other solution  using matplotlib s nonblocking API calls

User · Answer

If you want to open multiple figures  while keeping them all opened  this code worked for me   show block False  draw

User · Answer

My answer is a little off topic  but I just decided to get away from matplotlib in my application because of the problem that is stated in this question  Alternatively  you can use plotly  It does not block the process

User · Answer

Try  import matplotlib pyplot as plt plt plot  1 2 3   plt show block False    other code            Put plt show     at the very end of your script to make sure Python doesn t bail out   before you finished examining    The show   documentation says      In non-interactive mode  display all figures and block until the figures have been closed  in interactive mode it has no effect unless figures were created prior to a change from non-interactive to interactive mode  not recommended   In that case it displays the figures but does not block       A single experimental keyword argument  block  may be set to True or False to override the blocking behavior described above

User · Answer

Well  I had great trouble figuring out the non-blocking commands    But finally  I managed to rework the  Cookbook Matplotlib Animations - Animating selected plot elements  example  so it works with threads  and passes data between threads either via global variables  or through a multiprocess Pipe  on Python 2 6 5 on Ubuntu 10 04    The script can be found here  Animating selected plot elements-thread py - otherwise pasted below  with fewer comments  for reference    import sys import gtk  gobject import matplotlib matplotlib use  GTKAgg   import pylab as p import numpy as nx  import time  import threading     ax   p subplot 111  canvas   ax figure canvas    for profiling tstart   time time      create the initial line x   nx arange 0 2 nx pi 0 01  line    ax plot x  nx sin x   animated True     save the clean slate background -- everything but the animated line   is drawn and saved in the pixel buffer background background   canvas copy from bbox ax bbox      just a plain global var to pass data  from main  to plot update thread  global mypass    http   docs python org library multiprocessing html pipes-and-queues from multiprocessing import Pipe global pipe1main  pipe1upd pipe1main  pipe1upd   Pipe       the kind of processing we might want to do in a main   function    will now be done in a  main thread  - so it can run in   parallel with gobject idle add update line  def threadMainTest        global mypass     global runthread     global pipe1main      print  tt       interncount   1      while runthread           mypass    1         if mypass  gt  100    start  speeding up  animation  only after 100 counts have passed             interncount    1 03         pipe1main send interncount          time sleep 0 01      return     main plot   GUI update def update line  args       global mypass     global t0     global runthread     global pipe1upd      if not runthread          return False       if pipe1upd poll      check first if there is anything to receive         myinterncount   pipe1upd recv        update line cnt   mypass        restore the clean slate background     canvas restore region background        update the data     line set ydata nx sin x  update line cnt myinterncount  10 0         just draw the animated artist     ax draw artist line        just redraw the axes rectangle     canvas blit ax bbox       if update line cnt gt  500            print the timing info and quit         print  FPS     update line cnt  time time  -tstart           runthread 0         t0 join 1             print  exiting          sys exit 0       return True    global runthread  update line cnt   0 mypass   0  runthread 1  gobject idle add update line   global t0 t0   threading Thread target threadMainTest  t0 start       start the graphics update thread p show    print  out    will never print - show   blocks indefinitely     Hope this helps someone  Cheers

User · Answer

In many cases it is more convenient til save the image as a  png file on the hard drive  Here is why   Advantages    You can open it  have a look at it and close it down any time in the process  This is particularly convenient when your application is running for a long time  Nothing pops up and you are not forced to have the windows open  This is particularly convenient when you are dealing with many figures  Your image is accessible for later reference and is not lost when closing the figure window    Drawback    The only thing I can think of is that you will have to go and finder the folder and open the image yourself

User · Answer

In many cases it is more convenient til save the image as a  png file on the hard drive  Here is why   Advantages    You can open it  have a look at it and close it down any time in the process  This is particularly convenient when your application is running for a long time  Nothing pops up and you are not forced to have the windows open  This is particularly convenient when you are dealing with many figures  Your image is accessible for later reference and is not lost when closing the figure window    Drawback    The only thing I can think of is that you will have to go and finder the folder and open the image yourself

User · Answer

The OP asks about detatching matplotlib plots  Most answers assume command execution from within a python interpreter  The use-case presented here is my preference for testing code in a terminal  e g  bash  where a file py is run and you want the plot s  to come up but the python script to complete and return to a command prompt    This stand-alone file uses multiprocessing to launch a separate process for plotting data with matplotlib  The main thread exits using the os  exit 1  mentioned in this post  The os  exit   forces main to exit but leaves the matplotlib child process alive and responsive until the plot window is closed  It s a separate process entirely   This approach is a bit like a Matlab development session with figure windows that come up with a responsive command prompt  With this approach  you have lost all contact with the figure window process  but  that s ok for development and debugging  Just close the window and keep testing   multiprocessing is designed for python-only code execution which makes it perhaps better suited than subprocess  multiprocessing is cross-platform so this should work well in Windows or Mac with little or no adjustment  There is no need to check the underlying operating system  This was tested on linux  Ubuntu 18 04LTS      usr bin python3  import time import multiprocessing import os  def plot graph data       from matplotlib pyplot import plot  draw  show     print  entered plot graph         plot data      show     this will block and remain a viable process as long as the figure window is open     print  exiting plot graph   process    if   name         main         print  starting   main         multiprocessing Process target plot graph  args   1  2  3     start       time sleep 5      print  exiting main       os  exit 0    this exits immediately with no cleanup or buffer flushing   Running file py brings up a figure window  then   main   exits but the multiprocessing   matplotlib figure window remains responsive with zoom  pan  and other buttons because it is an independent process   Check the processes at the bash command prompt with   ps ax grep -v grep  grep file py

User · Answer

The OP asks about detatching matplotlib plots  Most answers assume command execution from within a python interpreter  The use-case presented here is my preference for testing code in a terminal  e g  bash  where a file py is run and you want the plot s  to come up but the python script to complete and return to a command prompt    This stand-alone file uses multiprocessing to launch a separate process for plotting data with matplotlib  The main thread exits using the os  exit 1  mentioned in this post  The os  exit   forces main to exit but leaves the matplotlib child process alive and responsive until the plot window is closed  It s a separate process entirely   This approach is a bit like a Matlab development session with figure windows that come up with a responsive command prompt  With this approach  you have lost all contact with the figure window process  but  that s ok for development and debugging  Just close the window and keep testing   multiprocessing is designed for python-only code execution which makes it perhaps better suited than subprocess  multiprocessing is cross-platform so this should work well in Windows or Mac with little or no adjustment  There is no need to check the underlying operating system  This was tested on linux  Ubuntu 18 04LTS      usr bin python3  import time import multiprocessing import os  def plot graph data       from matplotlib pyplot import plot  draw  show     print  entered plot graph         plot data      show     this will block and remain a viable process as long as the figure window is open     print  exiting plot graph   process    if   name         main         print  starting   main         multiprocessing Process target plot graph  args   1  2  3     start       time sleep 5      print  exiting main       os  exit 0    this exits immediately with no cleanup or buffer flushing   Running file py brings up a figure window  then   main   exits but the multiprocessing   matplotlib figure window remains responsive with zoom  pan  and other buttons because it is an independent process   Check the processes at the bash command prompt with   ps ax grep -v grep  grep file py

User · Answer

While not directly answering OPs request  Im posting this workaround since it may help somebody in this situation     Im creating an  exe with pyinstaller since I cannot install python where I need to generate the plots  so I need the python script to generate the plot  save it as  png  close it and continue with the next  implemented as several plots in a loop or using a function    for this Im using   import matplotlib pyplot as plt  code generating the plot in a loop or function  saving the plot plt savefig var   plot png  bbox inches  tight   dpi 250    you can allways reopen the plot using os system var   plot png     unfortunately  png allows no interaction   the following avoids plot blocking the execution while in non-interactive mode plt show block False    and the following closes the plot while next iteration will generate new instance  plt close      Where  var  identifies the plot in the loop so it wont be overwritten

User · Answer

In my case  I wanted to have several windows pop up as they are being computed  For reference  this is the way   from matplotlib pyplot import draw  figure  show f1  f2   figure    figure   af1   f1 add subplot 111  af2   f2 add subplot 111  af1 plot  1 2 3   af2 plot  6 5 4   draw    print  continuing computation  show     PS  A quite useful guide to matplotlib s OO interface

User · Answer

You may want to read this document in matplotlib s documentation  titled   Using matplotlib in a python shell

User · Answer

You may want to read this document in matplotlib s documentation  titled   Using matplotlib in a python shell

User · Answer

plt figure 1  plt imshow your first image   plt figure 2  plt imshow your second image   plt show block False    That s important   raw input  Press ENTER to exist     Useful when you run your Python script from the terminal and you want to hold the running to see your figures until you press Enter

User · Answer

In my opinion  the answers in this thread provide methods which don t work for every systems and in more complex situations like animations  I suggest to have a look at the answer of MiKTeX in the following thread  where a robust method has been found   How to wait until matplotlib animation ends

User · Answer

I had to also add plt pause 0 001  to my code to really make it working inside a for loop  otherwise it would only show the first and last plot    import matplotlib pyplot as plt  plt scatter  0    1   plt draw   plt show block False   for i in range 10       plt scatter  i    i 1       plt draw       plt pause 0 001

User · Answer

Use the keyword  block  to override the blocking behavior  e g    from matplotlib pyplot import show  plot  plot 1    show block False     your code   to continue your code

User · Answer

On my system show   does not block  although I wanted the script to wait for the user to interact with the graph  and collect data using  pick event  callbacks  before continuing   In order to block execution until the plot window is closed  I used the following   fig   plt figure   ax   fig add subplot 1 1 1  ax plot x y     set processing to continue when window closed def onclose event       fig canvas stop event loop   fig canvas mpl connect  close event   onclose   fig show     this call does not block on my system fig canvas start event loop default     block here until window closed    continue with further processing  perhaps using result from callbacks   Note  however  that canvas start event loop default   produced the following warning   C  Python26 lib site-packages matplotlib backend bases py 2051  DeprecationWarning  Using default event loop until function specific to this GUI is implemented   warnings warn str DeprecationWarning    although the script still ran

User · Answer

It is better to always check with the library you are using if it supports usage in a non-blocking way   But if you want a more generic solution  or if there is no other way  you can run anything that blocks in a separated process by using the multprocessing module included in python  Computation will continue   from multiprocessing import Process from matplotlib pyplot import plot  show  def plot graph  args       for data in args          plot data      show    p   Process target plot graph  args   1  2  3     p start    print  yay  print  computation continues     print  that rocks    print  Now lets wait for the graph be closed to continue      p join     That has the overhead of launching a new process  and is sometimes harder to debug on complex scenarios  so I d prefer the other solution  using matplotlib s nonblocking API calls

User · Answer

You may want to read this document in matplotlib s documentation  titled   Using matplotlib in a python shell

User · Answer

Use plt show block False   and at the end of your script call plt show     This will ensure that the window won t be closed when the script is finished

User · Answer

plt figure 1  plt imshow your first image   plt figure 2  plt imshow your second image   plt show block False    That s important   raw input  Press ENTER to exist     Useful when you run your Python script from the terminal and you want to hold the running to see your figures until you press Enter

User · Answer

IMPORTANT  Just to make something clear  I assume that the commands are inside a  py script and the script is called using e g  python script py from the console   A simple way that works for me is    Use the block   False inside show   plt show block   False   Use another show   at the end of the  py script      Example of script py file   plt imshow  something                                                                  plt colorbar                                                                                plt xlabel  true                                                                       plt ylabel  predicted                                                                  plt title   the matrix        Add block   False                                            plt show block   False                                      OTHER CALCULATIONS AND CODE HERE                                           the next command is the last line of my script plt show

User · Answer

On my system show   does not block  although I wanted the script to wait for the user to interact with the graph  and collect data using  pick event  callbacks  before continuing   In order to block execution until the plot window is closed  I used the following   fig   plt figure   ax   fig add subplot 1 1 1  ax plot x y     set processing to continue when window closed def onclose event       fig canvas stop event loop   fig canvas mpl connect  close event   onclose   fig show     this call does not block on my system fig canvas start event loop default     block here until window closed    continue with further processing  perhaps using result from callbacks   Note  however  that canvas start event loop default   produced the following warning   C  Python26 lib site-packages matplotlib backend bases py 2051  DeprecationWarning  Using default event loop until function specific to this GUI is implemented   warnings warn str DeprecationWarning    although the script still ran

User · Answer

You may want to read this document in matplotlib s documentation  titled   Using matplotlib in a python shell

User · Answer

In my case  I wanted to have several windows pop up as they are being computed  For reference  this is the way   from matplotlib pyplot import draw  figure  show f1  f2   figure    figure   af1   f1 add subplot 111  af2   f2 add subplot 111  af1 plot  1 2 3   af2 plot  6 5 4   draw    print  continuing computation  show     PS  A quite useful guide to matplotlib s OO interface

User · Answer

My answer is a little off topic  but I just decided to get away from matplotlib in my application because of the problem that is stated in this question  Alternatively  you can use plotly  It does not block the process

User · Answer

I had to also add plt pause 0 001  to my code to really make it working inside a for loop  otherwise it would only show the first and last plot    import matplotlib pyplot as plt  plt scatter  0    1   plt draw   plt show block False   for i in range 10       plt scatter  i    i 1       plt draw       plt pause 0 001

User · Answer

Try  import matplotlib pyplot as plt plt plot  1 2 3   plt show block False    other code            Put plt show     at the very end of your script to make sure Python doesn t bail out   before you finished examining    The show   documentation says      In non-interactive mode  display all figures and block until the figures have been closed  in interactive mode it has no effect unless figures were created prior to a change from non-interactive to interactive mode  not recommended   In that case it displays the figures but does not block       A single experimental keyword argument  block  may be set to True or False to override the blocking behavior described above

User · Answer

In my case  I wanted to have several windows pop up as they are being computed  For reference  this is the way   from matplotlib pyplot import draw  figure  show f1  f2   figure    figure   af1   f1 add subplot 111  af2   f2 add subplot 111  af1 plot  1 2 3   af2 plot  6 5 4   draw    print  continuing computation  show     PS  A quite useful guide to matplotlib s OO interface

User · Answer

While not directly answering OPs request  Im posting this workaround since it may help somebody in this situation     Im creating an  exe with pyinstaller since I cannot install python where I need to generate the plots  so I need the python script to generate the plot  save it as  png  close it and continue with the next  implemented as several plots in a loop or using a function    for this Im using   import matplotlib pyplot as plt  code generating the plot in a loop or function  saving the plot plt savefig var   plot png  bbox inches  tight   dpi 250    you can allways reopen the plot using os system var   plot png     unfortunately  png allows no interaction   the following avoids plot blocking the execution while in non-interactive mode plt show block False    and the following closes the plot while next iteration will generate new instance  plt close      Where  var  identifies the plot in the loop so it wont be overwritten

User · Answer

Well  I had great trouble figuring out the non-blocking commands    But finally  I managed to rework the  Cookbook Matplotlib Animations - Animating selected plot elements  example  so it works with threads  and passes data between threads either via global variables  or through a multiprocess Pipe  on Python 2 6 5 on Ubuntu 10 04    The script can be found here  Animating selected plot elements-thread py - otherwise pasted below  with fewer comments  for reference    import sys import gtk  gobject import matplotlib matplotlib use  GTKAgg   import pylab as p import numpy as nx  import time  import threading     ax   p subplot 111  canvas   ax figure canvas    for profiling tstart   time time      create the initial line x   nx arange 0 2 nx pi 0 01  line    ax plot x  nx sin x   animated True     save the clean slate background -- everything but the animated line   is drawn and saved in the pixel buffer background background   canvas copy from bbox ax bbox      just a plain global var to pass data  from main  to plot update thread  global mypass    http   docs python org library multiprocessing html pipes-and-queues from multiprocessing import Pipe global pipe1main  pipe1upd pipe1main  pipe1upd   Pipe       the kind of processing we might want to do in a main   function    will now be done in a  main thread  - so it can run in   parallel with gobject idle add update line  def threadMainTest        global mypass     global runthread     global pipe1main      print  tt       interncount   1      while runthread           mypass    1         if mypass  gt  100    start  speeding up  animation  only after 100 counts have passed             interncount    1 03         pipe1main send interncount          time sleep 0 01      return     main plot   GUI update def update line  args       global mypass     global t0     global runthread     global pipe1upd      if not runthread          return False       if pipe1upd poll      check first if there is anything to receive         myinterncount   pipe1upd recv        update line cnt   mypass        restore the clean slate background     canvas restore region background        update the data     line set ydata nx sin x  update line cnt myinterncount  10 0         just draw the animated artist     ax draw artist line        just redraw the axes rectangle     canvas blit ax bbox       if update line cnt gt  500            print the timing info and quit         print  FPS     update line cnt  time time  -tstart           runthread 0         t0 join 1             print  exiting          sys exit 0       return True    global runthread  update line cnt   0 mypass   0  runthread 1  gobject idle add update line   global t0 t0   threading Thread target threadMainTest  t0 start       start the graphics update thread p show    print  out    will never print - show   blocks indefinitely     Hope this helps someone  Cheers

[python] Is there a way to detach matplotlib plots so that the computation can continue?

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