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How can I change my python path permanently?

I recently just installed Inkscape to my Windows 10 computer, and it changed my python path.
C:\Users\Chinyere\Documents\Django Files\Commercial>python
Python 3.8.9 (default, Apr 13 2021, 15:54:59) [GCC 10.2.0 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> print(sys.path)
['', 'C:\\Program Files\\Inkscape\\lib\\python38.zip', 'C:\\Program Files\\Inkscape\\lib\\python3.8', 'C:\\Program Files\\Inkscape\\lib\\python3.8\\lib-dynload', 'C:\\Program Files\\Inkscape\\lib\\python3.8\\site-packages']
I can't run my Django files. When I try, it pops-up error
C:\Users\Chinyere\Documents\Django Files\Commercial>python manage.py runserver
Traceback (most recent call last):
File "manage.py", line 10, in main
from django.core.management import execute_from_command_line
ModuleNotFoundError: No module named 'django'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 21, in <module>
main()
File "manage.py", line 12, in main
raise ImportError(
ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?
Please, how can I change it to the default python path without uninstalling Inkscape.

First, you can try install the package again. If you can not install it again try to reinstall your python.
*Note: You should use virtual environment in python so it is easier to manage your library. After finished, you can note what library you use and install all the library by once.
py -m pip freeze
( Virtual Env: https://docs.python.org/3/tutorial/venv.html
Pip freeze : https://pip.pypa.io/en/stable/cli/pip_freeze/ )

Uninstall Inkscape and reinstall.
While reinstalling Inkscape, be sure to uncheck "add to path" if it is checked.

Local python package install doesn't copy package any more?

This used to work but I don't know what changed; nothing has changed in this repo for a while.
I have a local python package that I want to install via pip. My source tree looks like:
./local_packages/my-package-0.0.3.tar.gz
and my requirements.txt has only
my-package
I run
pip install --find-links="./local_packages" --target=./python_modules/ -r requirements.txt
This finds my package and installs it in python_modules but I can't import it:
Python 3.6.7 (default, Nov 30 2020, 14:15:49)
[GCC Apple LLVM 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from my_package import *
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'my_package'
When I look in python_modules I see all of the dependencies of my-package as well as my_package-0.0.3-py3.6.egg-info/ but there is no module for just my_package.
If I downgrade pip from 20.3 to 19.3.1, then I see what I was expecting, with both a folder for .egg-info as well as for the module itself. My import works correctly etc.
Is this expected behavior? Am I missing something?

django, python, postgres and web deployment

This error has been haunting me. I have actually developed fixes and I document it and I successfully run the server on the below IP address. I try to reproduce my success after reinstalling the Ubuntu OS... with the same errors the same fixes won't do it anymore... now I need outside help. I have combed the internet for solutions. I try to add django to the PYTHONPATH and it IS added but when I exit the python interpreter the appended django path disappears!
Another item of detail that may help is that my website www.doman.com/admin is directed to the django admin login screen. I tried to log in using username and password but it fails which makes me think django is not working properly.
$ sudo python3 manage.py runserver 192.165.4.3:80
I get the error:
Traceback (most recent call last):
File "manage.py", line 8, in <module>
from django.core.management import execute_from_command_line
ModuleNotFoundError: No module named 'django'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 14, in <module>
) from exc
ImportError: Couldn't import Django. Are you sure it's installed and
available on your PYTHONPATH environment variable? Did you forget to
activate a virtual environment?
Django is installed within my environment:
$ django-admin --version
2.0.6
Python path attempt:
$ PYTHONPATH=/home/kap/dev_env/lib/python3.6/site-packages/django python
Python 3.6.5 (default, Apr 1 2018, 05:46:30)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import django
>>> sys.path
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'sys' is not defined
>>> import sys
>>> sys.path
['', '/home/kap/dev_env/lib/python3.6/site-packages/django', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/kap/dev_env/lib/python3.6/site-packages']
>>> quit()
Immediately confirm django is added but it disappeared:
$ python3
Python 3.6.5 (default, Apr 1 2018, 05:46:30)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
['', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/kap/dev_env/lib/python3.6/site-packages']

sudo bypasses your virtual-environment it runs as a root user and django is not installed in root account. That is why it is throwing error .you can run without sudo or you can install django in your root account by
sudo python3 -m pip install django

Try this:
sudo python3 -m pip install django
Or if you have a requirements.txt
sudo python3 -m pip install -r requirements.txt
It is better to manage port 80 by nginx.

I actually solved it before anyone posted:
`pip install django`
is what I used. More specifically I used 'pip install django psycopg2 and gunicorn' since installing all three together seemed to fix another issue. I was using pip3 instead of pip. There are so many 'sensitivities' so that the order of installation, specific flags and package versions of installations can break or make the whole thing. I'm thinking of making a tutorial of the whole thing and putting a video online. Maybe I can set a link on this page.

Consider pipenv - git repo is here, with more information. Better control of packages, ease of deployment, and better control of virtual environments.

Error while installing package developed with cliff

I wrote a command line tool with cliff 2.3.0, tested on my laptop (Mac, Python 2.7.12). When I was tried to install it (python setup.py install) on a server (Linux, Python 2.7.2), I encountered this error:
Installed /private/tmp/easy_install-EGMO15/cliff-2.3.0/pbr-1.10.0-py2.7.egg
ERROR:root:Error parsing
Traceback (most recent call last): File "/private/tmp/easy_install-EGMO15/cliff-2.3.0/pbr-1.10.0-> py2.7.egg/pbr/core.py", line 111, in pbr
attrs = util.cfg_to_args(path, dist.script_args) File "/private/tmp/easy_install-EGMO15/cliff-2.3.0/pbr-1.10.0-py2.7.egg/pbr/util.py", line 248, in cfg_to_args
kwargs = setup_cfg_to_setup_kwargs(config, script_args) File "/private/tmp/easy_install-EGMO15/cliff-2.3.0/pbr-1.10.0-py2.7.egg/pbr/util.py", line 431, in setup_cfg_to_setup_kwargs
if pkg_resources.evaluate_marker('(%s)' % env_marker):
AttributeError: 'module' object has no attribute 'evaluate_marker' error: Setup script exited with error in setup command: Error parsing /private/tmp/easy_install-EGMO15/cliff-2.3.0/setup.cfg: AttributeError: 'module' object has no attribute 'evaluate_marker'
Any suggestions?

It looks like your server may have a (much) older version of the setuptools package installed (which provides the pkg_resources module). The evaluate_marker method looks as if it first showed up at the end of 2014, so if you're using an older system it is possible that method is not available.
Depending on your environment, you may be able to simply pip install -U setuptools, or you may need to see if your distribution has a newer isntallable package available.
If you can update your question to include details about your server's operating environment (what distribution and version are you running? What version of Python? What version of setuptools?), we can probably provide a more complete answer.
Update
For example, Ubuntu 12.04 only has setuptools 0.6, and the pkg_resources module (which is packaged in the python-pkg-resources package) does not have the evaluate_marker method:
# python
Python 2.7.3 (default, Jun 22 2015, 19:33:41)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pkg_resources
>>> pkg_resources.evaluate_marker
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'evaluate_marker'
In this environment, I can install pip:
# apt-get install python-pip
And then upgrade the installed version of setuptools:
# pip install -U setuptools
And now:
# python
Python 2.7.3 (default, Jun 22 2015, 19:33:41)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pkg_resources
>>> pkg_resources.evaluate_marker
<function evaluate_marker at 0x1535050>
>>>
NB Upgrading distribution packages (e.g., things installed by apt-get in this example) using pip can often lead to sadness and heartache, and you are much better off if you are able to upgrade the underlying environment to one where such workarounds are not necessary. Alternatively, running your code from a Python virtual environment (so that your upgraded packages do not override system packages) is also a technically better solution.

How to install libgit2/pygit2 into virtualenv? (Ubuntu)

I have tried dulwich, and GitPython - neither of which seem mature. Now I am trying to install libgit2/pygit2. I have successfully installed them into the host packages environment, but now I need to get them installed in the virtualenv of the app I am building.
Python 2.7.3 (default, Sep 26 2013, 20:03:06)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pygit2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/pygit2/__init__.py", line 32, in <module>
import _pygit2
ImportError: libgit2.so.0: cannot open shared object file: No such file or directory
>>>
As you can see the current issue seems to be that the globally installed libgit2.so.0 cannot be found from within the virtualenv. Fair enough, that is what virtualenv is about after all,, sandboxing. So how do I go about linking/symlinking/building a version/copy of the libgit2.so for the virtualenv ?

I found the following script in a Gist that - when run while logged into a virtualenv -- will install the current libgit2/pygit2 together there in the venv.
https://gist.github.com/olivier-m/5755638
One note of caution, update the version numbers for both libraries to the same most recent version ( 0.20.0 at this time of writing ).