Python - add PYTHONPATH during command line module run

Question

I want to run   python somescript py somecommand   But  when I run this I need PYTHONPATH to include a certain directory  I can t just add it to my environment variables because the directory I want to add changes based on what project I m running  Is there a way to alter PYTHONPATH while running a script  Note  I don t even have a PYTHONPATH variable  so I don t need to worry about appending to it vs overriding it during running of this script

User · Answer

If you are running the command from a POSIX-compliant shell, like bash, you can set the environment variable like this:

PYTHONPATH="/path/to" python somescript.py somecommand

If it's all on one line, the PYTHONPATH environment value applies only to that one command.

$ echo $PYTHONPATH

$ python -c 'import sys;print("/tmp/pydir" in sys.path)'
False
$ PYTHONPATH=/tmp/pydir python -c 'import sys;print("/tmp/pydir" in sys.path)'
True
$ echo $PYTHONPATH

User · Answer

This is for windows   For example  I have a folder named  mygrapher  on my desktop  Inside  there s folders called  calculation  and  graphing  that contain Python files that my main file  grapherMain py  needs  Also   grapherMain py  is stored in  graphing   To run everything without moving files  I can make a batch script  Let s call this batch file  rungraph bat     ECHO OFF setlocal set PYTHONPATH  cd  grapher  cd  calculation python  cd  grapher grapherMain py endlocal   This script is located in  mygrapher   To run things  I would get into my command prompt  then do    gt cd Desktop mygrapher  this navigates into the  mygrapher  folder   gt rungraph bat  this executes the batch file

User · Answer

You may try this to execute a function inside your script  python -c  import sys  sys path append   your script path    import yourscript  yourscript yourfunction

User · Answer

import sys  sys path append  your certain directory     Basically sys path is a list with all the search paths for python modules  It is initialized by the interpreter  The content of PYTHONPATH is automatically added to the end of that list

User · Answer

For Mac Linux   PYTHONPATH  foo bar baz python somescript py somecommand   For Windows  setup a wrapper pythonpath bat    ECHO OFF setlocal set PYTHONPATH  1 python  2  3 endlocal   and call pythonpath bat script file like   pythonpath bat  foo bar baz somescript py somecommand

[python] Python - add PYTHONPATH during command line module run

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