WinError 2 The system cannot find the file specified Python

Question

I have a Fortran program and want to execute it in python for multiple files  I have 2000 input files but in my Fortran code I am able to run only one file at a time  How should I call the Fortran program in python   My Script   import subprocess import glob input   glob glob  C  Users Vishnu Desktop Fortran Program Rum   txt   output   glob glob  C  Users Vishnu Desktop Fortran Program Rum Output    f   open  output    w   for i in input      subprocess Popen   FORTRAN   C  Users Vishnu Desktop Fortran Program Rum phase1 f    --domain   i   f write i    Error   runfile  C  Users Vishnu Desktop test fn test py   wdir  C  Users Vishnu Desktop test fn   Traceback  most recent call last       File   lt ipython-input-3-f8f378816004 gt    line 1  in  lt module gt  runfile  C  Users Vishnu Desktop test fn test py   wdir  C  Users Vishnu Desktop test fn      File  C  Users Vishnu Anaconda3 lib site-packages spyder utils site sitecustomize py   line 866  in runfile execfile filename  namespace     File  C  Users Vishnu Anaconda3 lib site-packages spyder utils site sitecustomize py   line 102  in execfile exec compile f read    filename   exec    namespace     File  C  Users Vishnu Desktop test fn test py   line 30  in  lt module gt  subprocess Popen   FORTRAN   C  Users Vishnu Desktop Fortran Program Rum phase1 f    --domain   i      File  C  Users Vishnu Anaconda3 lib subprocess py   line 707  in   init   restore signals  start new session     File  C  Users Vishnu Anaconda3 lib subprocess py   line 990  in  execute child startupinfo   FileNotFoundError   WinError 2  The system cannot find the file specified   Edit   import subprocess import os input   os path normcase r C  Users Vishnu Desktop Fortran Program Rum   txt   output   os path normcase r   C  Users Vishnu Desktop Fortran Program Rum Output    f   open  output    w   for i in input      exe   os path normcase r   C  Program Files  x86  Silverfrost ftn95 exe       fortran script   os path normcase r   C  Users Vishnu Desktop test fn test f2py f95       i   os path normcase i      subprocess Popen  exe  fortran script   --domain   i       f write i    Error   FileNotFoundError   WinError 2  The system cannot find the file specified   Edit - 2   I have change my script as below  but error is same  input   os path normcase r C  Users Vishnu Desktop Fortran Program Rum   txt   output   os path normcase r C  Users Vishnu Desktop Fortran Program Rum Output    f   open  output    w   for i in input      exe   os path normcase r C  Program Files  x86  Silverfrost ftn95 exe       fortran script   os path normcase r C  Users Vishnu Desktop test fn test f2py f95       i   os path normcase i      subprocess Popen  exe  fortran script   --domain   i       f write i    Error  2  FileNotFoundError   WinError 2  The system cannot find the file specified   Error  3 - 15-03-2017  import subprocess import os input   os path normcase r C  Users Vishnu Desktop Fortran Program Rum   txt   output   os path normcase r C  Users Vishnu Desktop Fortran Program Rum Output    f   open  output    w    for i in input      exe   os path normcase r C  Program Files  x86  Silverfrost ftn95 exe       fortran script   os path normcase r C  Users Vishnu Desktop Fortran Program Rum phase1 f       i   os path normcase i      subprocess Popen  exe  fortran script   --domain   i   shell   True      f write i       Error     PermissionError   Errno 13  Permission denied   output

User · Answer

thank you  your first error guides me here and the solution solve mine too   for permission error  f   open  output    w     change it into f   open output  output    w       or something else  but the way you are now using is having access to the installation directory of Python which normally in Program Files  and it probably needs administrator permission    for sure  you could probably running python your script as administrator to pass permission error though

User · Answer

Popen expect a list of strings for non-shell calls and a string for shell calls   Call subprocess Popen with shell True   process   subprocess Popen command  stdout tempFile  shell True    Hopefully this solves your issue   This issue is listed here  https   bugs python org issue17023

User · Answer

I believe you need to  f file as a parameter  not as a command-single-string  same with the  --domain   i  which i would split in two elements of the list  Assuming that     you have the path set for FORTRAN executable   the    is indeed the correct way for the FORTRAN executable   I would change this line   subprocess Popen   FORTRAN   C  Users Vishnu Desktop Fortran Program Rum phase1 f    --domain   i     to   subprocess Popen   FORTRAN      C  Users Vishnu Desktop Fortran Program Rum phase1 f    --domain   i     If that doesn t work  you should do a os path exists   for the  f file  and check that you can launch the FORTRAN executable without any path  and set the path or system path variable accordingly    EDIT 6-Mar-2017   As the exception  detailed in the original post  is a python exception from subprocess  it is likely that the WinError 2 is because it cannot find FORTRAN  I highly suggest that you specify full path for your executable   for i in input      exe   r c  somedir fortrandir fortran exe      fortran script   r   C  Users Vishnu Desktop Fortran Program Rum phase1 f      subprocess Popen  exe  fortran script   --domain   i     if you need to convert the forward-slashes to backward-slashes  as suggested in one of the comments  you can do this   for i in input      exe   os path normcase r c  somedir fortrandir fortran exe       fortran script   os path normcase r   C  Users Vishnu Desktop Fortran Program Rum phase1 f       i   os path normcase i      subprocess Popen  exe  fortran script   --domain   i      EDIT 7-Mar-2017   The following line is incorrect   exe   os path normcase r   C  Program Files  x86  Silverfrost ftn95 exe    I am not sure why you have    as a prefix for every path  don t do that   for i in input      exe   os path normcase r C  Program Files  x86  Silverfrost ftn95 exe      fortran script   os path normcase r C  Users Vishnu Desktop Fortran Program Rum phase1 f       i   os path normcase i      subprocess Popen  exe  fortran script   --domain   i      2nd EDIT 7-Mar-2017   I do not know this FORTRAN or ftn95 exe  does it need a shell to function properly   in which case you need to launch as follows   subprocess Popen  exe  fortran script   --domain   i   shell   True    You really need to try to launch the command manually from the working directory which your python script is operating from  Once you have the command which is actually working  then build up the subprocess command

[python] WinError 2 The system cannot find the file specified (Python)

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