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I suggest not to rely on the raw PYTHONPATH because it can vary depending on the OS.

Instead of the PYTHONPATH value in the os.environ dict, use sys.path from the sys module. This is preferrrable, because it is platform independent:

import sys
print(sys.path)

The value of sys.path is initialized from the environment variable PYTHONPATH, plus an installation-dependent default (depending on your OS). For more info see

https://docs.python.org/2/library/sys.html#sys.path

https://docs.python.org/3/library/sys.html#sys.path

2 of 2

If PYTHONPATH hasn't been set then that's expected, maybe default it to an empty string:

import os
print(os.environ.get('PYTHONPATH', ''))

You may also be after:

import sys
print(sys.path)

How do I find out my PYTHONPATH using Python?

python - Trying to understand the pythonpath variable

python - How to get the PYTHONPATH in shell?

python - sys.path() and PYTHONPATH issues

How to Print a Path in Python?

Stack Overflow

stackoverflow.com › questions › 1489599 › how-do-i-find-out-my-pythonpath-using-python

How do I find out my PYTHONPATH using Python? - Stack Overflow

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856

You would probably also want this:

import sys
print(sys.path)

Or as a one liner from the terminal:

python -c "import sys; print('\n'.join(sys.path))"

Caveat: If you have multiple versions of Python installed you should use a corresponding command python2 or python3.

2 of 10

299

sys.path might include items that aren't specifically in your PYTHONPATH environment variable. To query the variable directly, use:

import os
try:
    user_paths = os.environ['PYTHONPATH'].split(os.pathsep)
except KeyError:
    user_paths = []

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People also ask

How do I add PYTHONPATH inside a Python script?

Changing os.environ["PYTHONPATH"] changes the process environment and can affect child processes started afterwards. For an import in the running interpreter, add the intended directory to sys.path before importing, or install the package into that interpreter’s environment.

askpython.com

askpython.com › python › built-in-methods › pythonpath-in-shell

askpython.com › python › built-in-methods › pythonpath-in-shell

Is PYTHONPATH required to import installed packages?

Python adds applicable package locations through its normal initialization. If an installed package cannot be imported, identify the active interpreter before adding extra paths.

askpython.com

askpython.com › python › built-in-methods › pythonpath-in-shell

How do I set multiple directories in PYTHONPATH?

Join directory paths with the operating system’s separator. It is a colon on Linux and macOS and a semicolon on Windows, and os.pathsep reports the appropriate character.

askpython.com

geeksforgeeks.org › python › sys-path-in-python

GeeksforGeeks

sys.path in Python - GeeksforGeeks

August 21, 2024 - THROUGH ENVIRONMENT VARIABLES- An environment variable that contains the path an interpreter can take while looking for modules can be employed. Once set, it hints interpreter with directories to locate a module. The following example shows how this can be done. PYTHONPATH=C:\Users\Vanshi\Desktop · Python · # importing module import sys # printing all directories sys.path ·

Note.nkmk.me

note.nkmk.me › home › python

Check and Add the Module Search Path in Python: sys.path | note.nkmk.me

May 12, 2023 - sys.path — System-specific parameters and functions — Python 3.11.3 documentation · sys.path is a list of strings specifying the module search path. You can view these paths using print().

AskPython

askpython.com › python › built-in-methods › pythonpath-in-shell

medium.com › @gokulg.me › python-sys-module-from-beginner-to-advanced-b0f6bc73c8c2

3 weeks ago - python3 -c "import sys; print('\n'.join(sys.path))"

Medium

Python sys Module: From Beginner to Advanced | by Gokul G | Medium

February 26, 2025 - Python searches for modules in directories listed in sys.path. You can append a new path dynamically: sys.path.append("/custom/path/to/module") print(sys.path)

Stack Overflow

stackoverflow.com › questions › 63348046 › to-print-pythons-sys-path-from-the-command-line

To print python's sys.path from the command line - Stack Overflow

linuxhint.com › sys-path-append-python

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python -c "import sys; print (sys.path)"

2 of 2

There is no such flag. -m does something completely different from what you want. You can go through the Python command line docs to see the lack of such a flag if you want.

Just put the import in the command.

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Linux Hint

How to Use Sys.path.append() in Python – Linux Hint

By declaring the following, we can check the current Python path: import sys from pprint import pprint pprint(sys.path) Here, the pprint module is just used to make things look pretty, so you can ignore that part, and concentrate on the rest. All we’re trying to do here is to print out sys.path.

How to Use Linux

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understanding sys.path in Python - howtouselinux

October 9, 2025 - To access a function or variable in an imported module, you need to use the dot (.) operator. For example, if you want to use the print function from the sys module, you would use the following syntax: ... Despite these potential problems, sys.path is a powerful tool that can make your life as a Python programmer a lot easier.

W3docs

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How do I find out my PYTHONPATH using Python? | W3docs

You can use the sys module in Python to access the sys.path variable, which contains a list of directories that Python looks in for modules to import. Here is a code snippet that you can use to print out the current value of sys.path:

CodeGenes

codegenes.net › blog › how-to-check-python-path

How to Check Python Path — codegenes.net

The sys module in Python provides access to some variables used or maintained by the Python interpreter and to functions that interact strongly with the interpreter. You can use the sys.path variable to check the Python path in a Python script. import sys # Print the Python path print(sys.path)

Dummies

dummies.com › article › technology › programming-web-design › python › how-to-find-path-information-in-python-148336

How to Find Path Information in Python | dummies

December 28, 2021 - You see the Python Shell window appear. Type import sys and press Enter. Type for p in sys.path: print(p) in a new cell and click Run Cell

Author:

reddit.com › r/learnpython › [eli5] what is sys.path?

r/learnpython on Reddit: [ELI5] What is sys.path?

September 25, 2016 -

What is sys.path? And exactly, in which directory I can find it and what does it do?

It's not a file, it's basically a "variable" that determines where on the file system Python will look for modules to import. So, if you run import whatever, Python will first search the current directory, and then start looking through every directory in sys.path until it finds a module named whatever or runs out of places to look (and raises an ImportError).

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2 of 2

Initialized from the environment variable PYTHONPATH, plus an installation-dependent default. -- https://docs.python.org/3/library/sys.html#sys.path Try: import sys, print(sys.path)

Ask Ubuntu

askubuntu.com › questions › 384996 › what-does-my-pythonpath-contain

12.04 - What does my PYTHONPATH contain? - Ask Ubuntu

1 of 1

Typically, the environment variable $PYTHONPATH is empty (try echo $PYTHONPATH). The actual list of folders python searches for libraries can be found with (in python):

import sys
print(sys.path)

This will consist (in search order) of the current directory, any directories in your $PYTHONPATH, and finally the default library directories, set by site.py. The main default locations are (where X.Y is the python version, eg 2.7):

/usr/lib/pythonX.Y (python system libraries, eg re, urllib)
/usr/lib/pythonX.Y/dist-packages (python libraries installed with deb packages)

If you use pip install --user or similar to install libraries as yourself, it will also contain the user library directory:

/home/USERNAME/.local/lib/pythonX.Y/site-packages

You can manipulate the PYTHONPATH by either setting the environment variable before you launch python (PYTHONPATH=$PYTHONPATH:/foo/bar), or by editing sys.path once you've started python (import sys; sys.path = ["/foo/bar"] + sys.path).

However, if you want to play with your own python libraries, a good idea is to create a virtualenv. This is a directory in which you can play around with your own versions of python libraries without any risk of messing up the python libraries used by the system. See How to set up and use a virtual python environment in Ubuntu? for information about creating and using a virtualenv.

Python Programming 53 - Sys.path and Changing Module Paths - YouTube

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GitHub

gist.github.com › bngsudheer › 8b84b2e4dd5440333621e603104ccf6c

Print $PYTHONPATH · GitHub

print-python-path.py · This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters ·

PythonAnywhere

help.pythonanywhere.com › pages › DebuggingImportError

Debugging with sys.path / ImportError issues | PythonAnywhere Help

May 13, 2015 - If it loads OK, it will drop you into a Python shell. Try doing the import manually at the command line. Then, check whether they really are coming from where you think they are: from foo.bar import baz import foo print(foo.__file__) # this should show the path to the module. Is it what you expect? import sys print('\n'.join(sys.path)) # does this show the files and folders you need?

Stack Exchange

unix.stackexchange.com › questions › 446741 › pythonpath-and-sys-path-dont-seems-to-match

debian - $PYTHONPATH and sys.path don't seems to match - Unix & Linux Stack Exchange

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sys.path in Python is a "list of strings that specifies the search path for modules. Initialized from the environment variable PYTHONPATH, plus an installation-dependent default." (taken from the Python online documentation).

For sys.path to be affected by PYTHONPATH, the latter has to be an environment variable. If it's not an environment variable but just a shell variable, it will not be visible by the python interpreter. You turn it into an environment variable by exporting it after setting its value, or at the same time, as in

export PYTHONPATH=/some/path:/goes/here