In Python script how do I set PYTHONPATH

Question

I know how to set it in my  etc profile and in my environment variables   But what if I want to set it during a script  Is it import os  sys  How do I do it

User · Answer

you can set PYTHONPATH  by os environ  PATHPYTHON    some path  then you need to call os system  python   to restart the python shell to make the newly added path effective

User · Answer

I linux this works too   import sys sys path extend    path to dotpy file

User · Answer

PYTHONPATH ends up in sys path  which you can modify at runtime   import sys sys path      whatever

User · Answer

You don t set PYTHONPATH  you add entries to sys path  It s a list of directories that should be searched for Python packages  so you can just append your directories to that list   sys path append   path to whatever     In fact  sys path is initialized by splitting the value of PYTHONPATH on the path separator character    on Linux-like systems    on Windows    You can also add directories using site addsitedir  and that method will also take into account  pth files existing within the directories you pass   That would not be the case with directories you specify in PYTHONPATH

User · Answer

You can get and set environment variables via os environ   import os user home   os environ  HOME    os environ  PYTHONPATH             But since your interpreter is already running  this will have no effect  You re better off using  import sys sys path append          which is the array that your PYTHONPATH will be transformed into on interpreter startup

User · Answer

If you put sys path append  dir to path   without check it is already added  you could generate a long list in sys path  For that  I recommend this   import sys import os   if you want this directory  try      sys path index   dir path     Or os getcwd   for this directory except ValueError      sys path append   dir path     Or os getcwd   for this directory

[python] In Python script, how do I set PYTHONPATH?

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