Why is pydot unable to find GraphViz s executables in Windows 8

Question

I have GraphViz 2 32 installed in Windows 8 and have added C  Program Files  x86  Graphviz2 32 bin to the System PATH variable  Still pydot is unable to find its executables   Traceback  most recent call last     File   lt pyshell 26 gt    line 1  in  lt module gt      graph write png  example1 graph png     File  build bdist win32 egg pydot py   line 1809  in  lt lambda gt      lambda path  f frmt  prog self prog   self write path  format f  prog prog     File  build bdist win32 egg pydot py   line 1911  in write     dot fd write self create prog  format     File  build bdist win32 egg pydot py   line 1953  in create      GraphViz  s executables not found    InvocationException  GraphViz s executables not found   I found this https   code google com p pydot issues detail id 65 but am unable to get the problem solved

User · Answer

For windows 8 1  amp  python 2 7   I fixed the problem by following below steps  1   Download and install graphviz-2 38 msi https   graphviz gitlab io  pages Download Download windows html  2   Set the path variable  Control Panel   System and Security   System   Advanced System Settings   Environment Variables   Path   Edit add  C  Program Files  x86  Graphviz2 38 bin    Restart your currently running application that requires the path

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I am running a Windows 10 machine and had some problems  too   I installed graphviz via msi installer  Adding via System settings did not work for me   I removed the installation with the msi and used chocolatey  a windows package manager  Removing the installed version is necessary  otherwise chocolatey won t install   Now it runs fine  I would recommend doing it this way

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You need to install from Graphviz and then just add the path of folder where you installed Graphviz and its bin directory to system environments path

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I too had the same issue and I finally resolved it by having a look at the library  The library considers making the path set as C  Program Files ATT Graphviz bin but by default Graphviz is installed to C  Program Files x86  Graphviz undergoing the 32-bit criteria hence the pydot fails in getting the required path  Simply shift the directory as required by the script and you re good to go  P S  - Consider making the equivalent changes to the Environmnet Variable  P S S - Also check if Graphviz is directly under Program Files x86  or under ATT

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after doing all the installation of graphviz  adding to the PATH of environment variables  you need to add these two lines    import os os environ  PATH      os pathsep    C  Program Files  x86  Graphviz2 38 bin

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Add dot exe to your path  right click my computer   advanced system settings   environment variables   high light  path    edit  then append everything in the quotes to path   C  Program Files  x86  Graphviz2 34 bin   depending on where you installed Graphviz ofcourse Then restart the python shell and type                   import pydot       pydot find graphviz         Make sure there is a slash after  bin  so it gets everything from inside the folder  I tried with out the slash and the above code returned nothing  however after adding the slash it returned the graphviz executables it needed and their paths

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In Windows  even after installing graphviz-2 38 msi  you can add your own path in pydot py  found under site-package folder    if os sys platform     win32          Try and work out the equivalent of  C  Program Files  on this       machine  might be on drive D   or in a different language             if os environ has key  PROGRAMFILES               Note  we could also use the win32api to get this           information  but win32api may not be installed           path   os path join os environ  PROGRAMFILES     ATT    GraphViz    bin        else            Just in case  try the default            path   r C  PYTHON27 GraphViz bin     add here

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Here is what I did for the above mentioned problem  I m using windows 10 os and python 3 6 5   Install PIP by clicking here open command prompt and type command  pip install graphviz  go to my computer this pc  and search with the keyword  graphviz  open the graphviz folder and copy its path and save it in notepad  In graphviz look for the bin folder and copy the folder by right click of your mouse now again head back to my computer and search for  pydotplus  a folder named pydotplus is displayed  Open it and paste the copy of bin folder  of Graphviz  that you copied earlier head to control panel system and security  system settings  advanced settings  environmental variables  add new path add the path that you copied in notepad and click a series of  ok    that s it now you can enjoy using graphviz

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I am not using a windows machine  I am on a linux platform  I ran across this executable-not-found issue in the context of using the python package pyAgrum for plotting bayesian networks  pyAgrum uses graphviz to plot the networks  I installed pyagrum and graphviz using the anaconda platform in a python 3 6 4 environment  i e  conda install  lt package name gt      I found the executables in  conda envs  lt environment name gt  bin directory  So  it was just a matter of getting my notebook kernel to find them    If you import os  use the command os environ  PATH   split os pathsep  to see the executable paths in which your environment is looking  If the path containing your graphviz executables isn t in there  you can add it by doing the following  os environ  PATH      os pathsep    lt path to executables gt     I imagine this solution will work outside of my context  The main downside to this solution is that you need to do it every time you restart the kernel

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I tried adding PATH via Control Panel  but restarting the command prompt is also needed  The following also works for updating the path in a Notebook session without exiting   import os       os environ  PATH      os pathsep    C  Program Files  x86  Graphviz2 38 bin

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For me   Win10  Anaconda3  Make sure you have done  conda install graphviz   I have to add to the PATH  C  Users username Anaconda3 Library bin graphviz  To modify PATH go to Control Panel   System and Security   System   Advanced System Settings   Environment Variables   Path   Edit   New  MAKE SURE TO RESTART YOUR IDE AFTER THIS  It should work

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If you dont want to mess around with path variables  e g  if you are no admin  and if you are working on windows  you can do the following which solved the problem for me    Open graphviz py  likely located in    Anaconda pkgs graphviz    Library bin  in an  editor  If you cant find it you might be able to open it via the error message   Go to the fuction   find executables and replace   elif os path exists os path join path  prg     exe        if was quoted        progs prg          os path join path  prg     exe            else        progs prg    os path join path  prg     exe     with  elif os path exists os path join path  prg     bat        if was quoted        progs prg          os path join path  prg     bat            else        progs prg    os path join path  prg     bat

User · Answer

install Graphviz here and add its bin path solved my problem  https   graphviz gitlab io  pages Download Download windows html  pip install Graphviz itself seems inadequate

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On Anaconda distro  pip install did not work  I did a pip uninstall graphviz  pip uninstall pydot  and then I did conda install graphviz and then conda install pydot  in this order  and then it worked

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I used conda install python-graphviz then conda install pydot and then conda install pydot plus and then it worked   So   conda install python-graphviz conda install pydot conda install pydotplus

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On Mac brew install graphviz solved the problem for me

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I had this issue and noticed that it was printing my PATH with two sets of double-quotes   I worked around the problem by adding the following to Line 1959 of   C  Anaconda Lib site-packages pydot py  self progs prog    os path normpath self progs prog  1 -1     Obviously not the best fix but it got me through the day

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Some things to know about graphviz    graphviz is not only a python module  it s also a standalone program   I believe you need both to make graphviz to work  The standalone graphviz program was originally developed by AT amp T  open sourced  then abandoned   The current maintainers of the package forgot to include Windows registry entries so Python can find the program executable  Line 620 of pydotplus graphviz py includes a backup path to look for graphviz if it isn t found in the registry   It uses the old ATT file path   Update the file path to what is on your machine  you will need to have administrator privileges  and graphviz should work with pydotplus    Example     Just in case  try the default    path   r C  Program Files  x86  Graphviz2 38 bin

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The solution is easy  you just need to download and install the Graphviz  from here   Then set the path variable to the bin directory  in my case it was C  Program Files  x86  Graphviz2 38 bin  Last  do the conda install python-graphviz and it should work fine

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you can use pydotplus instead of pydot then follow the belows   First  find C  Users zhangqianyuan AppData Local Programs Python Python36 Lib site-packages pydotplus  Second  open graphviz py  Third  find line 1925 - line 1972  find the function def create self  prog None  format  ps     Final  in the function    find    if prog not in self progs      raise InvocationException           GraphViz  s executable   s  not found    prog       if not os path exists self progs prog   or           not os path isfile self progs prog        raise InvocationException           GraphViz  s executable      is not            a file or doesn  t exist  format self progs prog          between the two blocks add this Your Graphviz s executable path    self progs prog     C  Program Files  x86  Graphviz2 38 bin gvedit exe  after adding the result is   if prog not in self progs      raise InvocationException           GraphViz  s executable   s  not found    prog   self progs prog     C  Program Files  x86  Graphviz2 38 bin gvedit exe   if not os path exists self progs prog   or           not os path isfile self progs prog        raise InvocationException           GraphViz  s executable      is not            a file or doesn  t exist  format self progs prog          save the changed file then you can run it successfully  you d better save it as bmp file because png file will not work

User · Answer

This happened because I had installed graphviz after I had installed pydot  Hence  pydot wasn t able to find it  Reinstalling it in the correct order solved the problem

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I found a manual solution  sudo apt-get install graphviz  graph write  test dot   dot -Tps test dot -o outfile ps  You can the files here  https   github com jecs89 LearningEveryDay tree master GP

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In  pydot py   located in     Anaconda3 Lib site-packages   replace   def get executable extension          type     - gt  str     if is windows            return   bat  if is anacoda   else   exe      else          return      with    def get executable extension          type     - gt  str     if is windows            return   exe      else          return      There does not seem to be any eason to add   bat  when the system is  Windows Anaconda  vs  Windows  and there may be no   bat  associated with the   exe   This seems better than adding a   bat  for every executable pydot calls

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The problem is that the path to GraphViz was not found by the pydot module as shown in the traceback       GraphViz  s executables not found    I solved this problem on my windows 7 machine by adding the GraphViz bin directory to my computer s PATH   Then restarting my python IDE to use the updated path    Install GraphViz if you haven t already  I used the MSI download  Get the path for gvedit exe  for me it was  C  Program Files  x86  Graphviz2 34 bin    Add this path to the computer s PATH One way to get to environment settings to set your path is to click on each of these button menu options  start- computer- system properties- advanced settings- environment variables Click Edit User path Add this string to the end of your Variable value list  including semicolon     C  Program Files  x86  Graphviz2 34 bin Click OK Restart your Python IDE

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in my case answer from Sadik pydot and graphviz error  Couldn t import dot parser  loading of dot files will not be possible worked for me on Ubuntu 12 04 5 LTS  sudo apt-get install python-pydot

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Tried all installation sequence as described in all solutions posting blogs  finally realized anaconda was not able to read the Environment variables  Closed Anaconda and Spyder  Then opened Anaconda in Administrator mode  on Windows 64 bit OS machine  and then opened Spyder  Script worked fine with PYDOT calls

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I m working on Windows 10 with Anaconda 3 6 5  I have not admin rights  so if someone is under the circumstances like me  this solution works perfectly   The path for my graphviz is looks C  Users User Name AppData Local Continuum anaconda3 Library bin graphviz   In Spyder or in Jupyter type the following   import os os environ  PATH   split os pathsep   This will lists all the path in you environment  Take a look to them  if your graphviz path is not here  then go find it and copy the path  like above in my example  Then type the following  os environ  PATH      os pathsep    C   Users  User Name  AppData  Local  Continuum  anaconda3  Library  bin  graphviz   That s all  but note that you have to run these command every time if you restart kernel

[graphviz] Why is pydot unable to find GraphViz's executables in Windows 8?

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