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.
PYTHONPATH=/foo/bar/baz python somescript.py somecommand
For Windows, setup a wrapper
@ECHO OFF setlocal set PYTHONPATH=%1 python %2 %3 endlocal
pythonpath.bat script file like;
pythonpath.bat /foo/bar/baz somescript.py somecommand
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.
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
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()"
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:
>cd Desktop\mygrapher (this navigates into the "mygrapher" folder) >rungraph.bat (this executes the batch file)