What sets up sys.path with Python, and when?

Most of the stuff is set up in Python's site. Py which is automatically imported when starting the interpreter (unless you start it with the S option). Some very paths are set up in the interpreter itself (you can find out which by starting python with S ).

Most of the stuff is set up in Python's site. Py which is automatically imported when starting the interpreter (unless you start it with the -S option). Some very paths are set up in the interpreter itself (you can find out which by starting python with -S).

Additionally, some frameworks (like Django I think) modify sys. Path upon startup to meet their requirements. Btw.

The site module has a pretty good documentation, a commented source code and prints out some information if you run it via python -m site.

From Learning Python: sys. Path is the module search path. Python configures it at program startup, automatically merging the home directory of the top-level file (or an empty string to designate the current working directory), any PYTHONPATH directories, the contents of any .

Pth file paths you've created, and the standard library directories. The result is a list of directory name strings that Python searches on each import of a new file.

Path has these parts: OS paths that have your system libraries current directory python started from environmental variable $PYTHONPATH you can add paths at runtime. Paths are not ignored. But, they may not be found and that will not raise an error.Sys.

Path should only be added too, not subtracted from. Django would not remove paths.

Site. Py is indeed the answers. I wanted to remove any dependencies on the old Python that is installed by default on my mac.

This works pretty good, as 'site. Py' is called each time the python interpreter is started. For Mac, I manually added the following line at the end of main() in /System/Library/Frameworks/Python.

Framework/Versions/2.7/Extras/lib/python/site. Py: sys. Path = filter (lambda a: not a.

Startswith('/System'), sys. Path).

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