how to use PYTHONPATH for independent python application

Question

Can anyone let me know how to set PYTHONPATH?

Do we need to set it in the environment variables (is it system specific) or we can independently set the PYTHONPATH and use it to run any independent python application?

i need to pick the module from a package available in directory which is different from the directory from which I am running my application . How to include these packages in my application

It is system specific, You may be confused with the imporations of the module — m.nachury
– m.nachury, Commented Jul 17, 2017 at 12:41
What do you mean by "independent python application"? Please describe what the problem is. — mzjn
– mzjn, Commented Jul 17, 2017 at 12:46
This answer depends on the OS, so how would it be "independent"? — OneCricketeer
– OneCricketeer, Commented Jul 17, 2017 at 13:09
i need to pick the module from a package available in directory which is different from the directory from which I am running my application . How to include these packages in my application — Aakash Agrawal
– Aakash Agrawal, Commented Jul 17, 2017 at 13:13

Jileshl · Accepted Answer · 2017-07-17 13:26:58Z

1

I assume you are using Linux

Before executing your application u can metion pythonpath=path && execution script

Other elegant way is using virtualenv. Where u can have diff packages for each application. Before exection say workon env and then deactivate

Python3 has virtualenv by default

answered Jul 17, 2017 at 13:26

Jileshl

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2 Comments

OneCricketeer Over a year ago

venv is included, not virtualenv. Also && isn't necessary

Jileshl Over a year ago

&& is for santiy. venv is similar to virtualenv

zwer · Accepted Answer · 2017-07-17 13:40:57Z

0

Instead of messing with system environment variables and paths set therein, if you only need to add a specific directory to the module lookup path of your application use:

import sys

sys.path.append("path/to/your/packages")

It's not recommended to mess with your paths in general - if you have to, you should probably rethink your application design - but if you still decide that you have to, this is more preferable than messing with system paths.

answered Jul 17, 2017 at 13:40

zwer

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