matplotlib does not show my drawings although I call pyplot show

Question

Help required on matplotlib  Yes  I did not forget calling the pyplot show       ipython --pylab  import matplotlib pyplot as p  p plot range 20   range 20     It returns matplotlib lines Line2D at 0xade2b2c as the output   p show     There is nothing to happen  No error message  No new window  Nothing  I install matplotlib by using pip and I didn t take any error messages    Details   I use    Ubuntu IPython v0 11 Python v2 6 6 matplotlib v1 0 1

User · Answer

Just type   plt ion    See https   www youtube com watch v 1zmV8lZsHF4 at 23 30    plt is used because of my import  import matplotlib pyplot as plt  I m using python2 7 on a mac with iTerm2

User · Answer

I ran into the exact same problem on Ubuntu 12 04  because I installed matplotlib  within a virtualenv  using  pip install matplotlib   To make long story short  my advice is  don t try to install matplotlib using pip or by hand  let a real package manager  e g  apt-get   synaptic  install it and all its dependencies for you   Unfortunately  matplotlib s backends  alternative methods for actually rendering your plots  have all sorts of dependencies that pip will not deal with   Even worse  it fails silently  that is  pip install matplotlib appears to install matplotlib successfully   But when you try to use it  e g  pyplot show     no plot window will appear   I tried all the different backends that people on the web suggest  Qt4Agg  GTK  etc    and they all failed  i e  when I tried to import matplotlib pyplot  I get ImportError because it s trying to import some dependency that s missing    I then researched how to install those dependencies  but it just made me want to give up using pip  within virtualenv  as a viable installation solution for any package that has non-Python package dependencies     The whole experience sent me crawling back to apt-get   synaptic  i e  the Ubuntu package manager  to install software like matplotlib   That worked perfectly   Of course  that means you can only install into your system directories  no virtualenv goodness  and you are stuck with the versions that Ubuntu distributes  which may be way behind the current version

User · Answer

If I set my backend to template in    matplotlib matplotlibrc  then I can reproduce your symptoms      matplotlib matplotlibrc     backend        GtkAgg backend        template   Note that the file matplotlibrc may not be in directory    matplotlib   In this case  the following code shows where it is    gt  gt  gt  import matplotlib  gt  gt  gt  matplotlib matplotlib fname       In  1   import matplotlib pyplot as p  In  2   p plot range 20  range 20   Out 2     lt matplotlib lines Line2D object at 0xa64932c gt    In  3   p show       If you edit    matplotlib matplotlibrc and change the backend to something like GtkAgg  you should see a plot  You can list all the backends available on your machine with  import matplotlib rcsetup as rcsetup print rcsetup all backends    It should return a list like     GTK    GTKAgg    GTKCairo    FltkAgg    MacOSX    QtAgg    Qt4Agg    TkAgg    WX    WXAgg    CocoaAgg    agg    cairo    emf    gdk    pdf    ps    svg    template     Reference    Customizing matplotlib

User · Answer

Adding the following two lines before importing pylab seems to work for me   import matplotlib matplotlib use  gtk    import sys import pylab import numpy as np

User · Answer

Be sure to have this startup script enabled     Preferences   Console   Advanced Options      usr lib python2 7 dist-packages spyderlib scientific startup py   If the standard PYTHONSTARTUP is enabled you won t have an interactive plot

User · Answer

For future reference   I have encountered the same problem -- pylab was not showing under ipython   The problem was fixed by changing ipython s config file  ipython config py    In the config file  c InteractiveShellApp pylab    auto   I changed  auto  to  qt  and now I see graphs

User · Answer

matplotlib inline  For me working with notebook  adding the above line before the plot works

User · Answer

Similar to  Rikki  I solved this problem by upgrading matplotlib with pip install matplotlib --upgrade  If you can t upgrade uninstalling and reinstalling may work   pip uninstall matplotlib pip install matplotlib

User · Answer

After running your code include   import pylab as p p show

User · Answer

I had to install matplotlib from source to get this to work  The key instructions  from http   www pyimagesearch com 2015 08 24 resolved-matplotlib-figures-not-showing-up-or-displaying   are     workon plotting   pip uninstall matplotlib   git clone https   github com matplotlib matplotlib git   cd matplotlib   python setup py install   By changing the backend  as  unutbu says  I just ran into loads more problems with all the different backends not working either

User · Answer

I found that I needed window   Tk   and then window mainloop

User · Answer

For me the problem happens if I simply create an empty matplotlibrc file under    matplotlib on macOS  Adding  backend  macosx  in it fixes the problem   I think it is a bug  if backend is not specified in my matplotlibrc it should take the default value

User · Answer

For Ubuntu 12 04   sudo apt-get install python-qt4 virtualenv  env --no-site-packages source  env bin activate easy install -U distribute ln -s  usr lib python2 7 dist-packages PyQt4   ln -s  usr lib python2 7 dist-packages sip so   pip install matplotlib

User · Answer

What solved my problem was just using the below two lines in ipython notebook at the top   matplotib inline  pylab inline   And it worked  I m using Ubuntu16 04 and ipython-5 1

[python] matplotlib does not show my drawings although I call pyplot.show()

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