set pythonpath before import statements

Question

My code is   import scriptlib abc import scriptlib xyz  def foo          some operations   but the scriptlib is in some other directory  so I will have to include that directory in environment variable  PYTHONPATH    Is there anyway in which I can first add the scriptlib directory in environment variable  PYTHONPATH  before import statement getting executed like    import sys sys path append   mypath scriptlib   import scriptlib abc import scriptlib xyz  def foo          some operations   If so  is the value only for that command prompt or is it global    Thanks in advance

User · Answer

As also noted in the docs here  Go to Python X X Lib and add these lines to the site py there   import sys sys path append  yourpathstring     This changes your sys path so that on every load  it will have that value in it      As stated here about site py        This module is automatically imported during initialization  Importing this module will append site-specific paths to the module search path and add a few builtins       For other possible methods of adding some path to sys path see these docs

User · Answer

This will add a path to your Python process   instance  i e  the running executable   The path will not be modified for any other Python processes  Another running Python program will not have its path modified  and if you exit your program and run again the path will not include what you added before  What are you are doing is generally correct   set py   import sys sys path append   tmp TEST     loop py  import sys import time while True    print sys path   time sleep 1    run  python loop py  amp   This will run loop py  connected to your STDOUT  and it will continue to run in the background  You can then run python set py  Each has a different set of environment variables  Observe that the output from loop py does not change because set py does not change loop py s environment   A note on importing  Python imports are dynamic  like the rest of the language  There is no static linking going on  The import is an executable line  just like sys path append

[python] set pythonpath before import statements

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