Python: Referencing another project

Question

I want to be able to run my Python project from the command line. I am referencing other projects, so I need to be able run modules in other folders.

One method of

Answer 1

If by "run modules" you mean importing them, you might be interested in this question I asked a while ago.

Answer 2

If you import sys, it contains a list of the directories in PYTHONPATH as sys.path

Adding directories to this list (sys.path.append("my/path")) allows you to import from those locations in the current module as normal without changing the global settings on your system.

Answer 3

Take a look at tools like

1. virtualenv, to set up a virtual python, in which you can install your modules without getting them globally. http://pypi.python.org/pypi/virtualenv

2. Setuptools, which allows you to specify (and automatically install) dependencies for your modules. http://pypi.python.org/pypi/setuptools (If you have problems with setuptools, take a look at Distribute, a maintained fork. http://pypi.python.org/pypi/distribute )

3. Buildout, which allows you deploy a complete application environment, including third-party software such as MySQL or anything else. http://pypi.python.org/pypi/zc.buildout/

Answer 4

I just realised that I have actually solved this problem before. Here is the approach I used - much more complex than mavnn, but I was also solving the problem of running a Python2.x program from a Python 3.0

import os
import subprocess
env=os.environ.copy()
env['PYTHONPATH']=my_libraries
kwargs={"stdin":subprocess.PIPE, "env":env}
subprocess.Popen(["python","-u",program_path],**kwargs)

Answer 5

First, I make sure that the module I want to include hasn't been installed globally. Then I add a symlink within the includee's directory:

# With pwd == module to which I want to add functionality.
ln -s /path/to/some_other_module_to_include .

and then I can do a standard import. This allows multiple versions etc. It does not require changing any global settings, and you don't need to change the program code if you work on different machines (just change the symlink).