How do you set your pythonpath in an already-created virtualenv?
Question:
What file do I edit, and how? I created a virtual environment.
Answers:
It’s already answered here -> Is my virtual environment (python) causing my PYTHONPATH to break?
UNIX/LINUX
Add “export PYTHONPATH=/usr/local/lib/python2.0” this to ~/.bashrc file and source it by typing “source ~/.bashrc” OR “. ~/.bashrc”.
WINDOWS XP
1) Go to the Control panel
2) Double click System
3) Go to the Advanced tab
4) Click on Environment Variables
In the System Variables window, check if you have a variable named PYTHONPATH. If you have one already, check that it points to the right directories. If you don’t have one already, click the New button and create it.
PYTHON CODE
Alternatively, you can also do below your code:-
import sys
sys.path.append("/home/me/mypy")
The most elegant solution to this problem is here.
Original answer remains, but this is a messy solution:
If you want to change the PYTHONPATH
used in a virtualenv, you can add the following line to your virtualenv’s bin/activate
file:
export PYTHONPATH="/the/path/you/want"
This way, the new PYTHONPATH
will be set each time you use this virtualenv.
EDIT: (to answer @RamRachum’s comment)
To have it restored to its original value on deactivate
, you could add
export OLD_PYTHONPATH="$PYTHONPATH"
before the previously mentioned line, and add the following line to your bin/postdeactivate
script.
export PYTHONPATH="$OLD_PYTHONPATH"
The comment by @s29 should be an answer:
One way to add a directory to the virtual environment is to install virtualenvwrapper (which is useful for many things) and then do
mkvirtualenv myenv
workon myenv
add2virtualenv . #for current directory
add2virtualenv ~/my/path
If you want to remove these path edit the file myenvhomedir/lib/python2.7/site-packages/_virtualenv_path_extensions.pth
Documentation on virtualenvwrapper can be found at http://virtualenvwrapper.readthedocs.org/en/latest/
Specific documentation on this feature can be found at
http://virtualenvwrapper.readthedocs.org/en/latest/command_ref.html?highlight=add2virtualenv
I modified my activate script to source the file .virtualenvrc
, if it exists in the current directory, and to save/restore PYTHONPATH
on activate/deactivate.
You can find the patched activate
script here.. It’s a drop-in replacement for the activate script created by virtualenv 1.11.6.
Then I added something like this to my .virtualenvrc
:
export PYTHONPATH="${PYTHONPATH:+$PYTHONPATH:}/some/library/path"
- Initialize your virtualenv
cd venv
source bin/activate
- Just set or change your python path by entering command following:
export PYTHONPATH='/home/django/srmvenv/lib/python3.4'
- for checking python path enter in python:
python
>> import sys
>> sys.path
You can create a .pth
file that contains the directory to search for, and place it in the {venv-root}/lib/{python-version}/site-packages
directory. E.g.:
cd $(python -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
echo /some/library/path > some-library.pth
The effect is the same as adding /some/library/path
to sys.path
, and remain local to the virtualenv
setup.
The answers here really confused me. I’m not sure if I’m missing something but I found pyvenv.cfg
at venv/pyvenv.cfg
the ENTIRE contents of that file was
home = C:UsersUser.pyenvpyenv-winversions3.10.7
include-system-site-packages = false
version = 3.10.7
all I did was change User
to NewUser
and that stopped the error
No Python at 'C:UsersUser.pyenvpyenv-winversions3.9.6python.exe'
But yeah, I wasted an hour on this when ctrl+shift+f solved it easily.
What file do I edit, and how? I created a virtual environment.
It’s already answered here -> Is my virtual environment (python) causing my PYTHONPATH to break?
UNIX/LINUX
Add “export PYTHONPATH=/usr/local/lib/python2.0” this to ~/.bashrc file and source it by typing “source ~/.bashrc” OR “. ~/.bashrc”.
WINDOWS XP
1) Go to the Control panel
2) Double click System
3) Go to the Advanced tab
4) Click on Environment Variables
In the System Variables window, check if you have a variable named PYTHONPATH. If you have one already, check that it points to the right directories. If you don’t have one already, click the New button and create it.
PYTHON CODE
Alternatively, you can also do below your code:-
import sys
sys.path.append("/home/me/mypy")
The most elegant solution to this problem is here.
Original answer remains, but this is a messy solution:
If you want to change the PYTHONPATH
used in a virtualenv, you can add the following line to your virtualenv’s bin/activate
file:
export PYTHONPATH="/the/path/you/want"
This way, the new PYTHONPATH
will be set each time you use this virtualenv.
EDIT: (to answer @RamRachum’s comment)
To have it restored to its original value on deactivate
, you could add
export OLD_PYTHONPATH="$PYTHONPATH"
before the previously mentioned line, and add the following line to your bin/postdeactivate
script.
export PYTHONPATH="$OLD_PYTHONPATH"
The comment by @s29 should be an answer:
One way to add a directory to the virtual environment is to install virtualenvwrapper (which is useful for many things) and then do
mkvirtualenv myenv
workon myenv
add2virtualenv . #for current directory
add2virtualenv ~/my/path
If you want to remove these path edit the file myenvhomedir/lib/python2.7/site-packages/_virtualenv_path_extensions.pth
Documentation on virtualenvwrapper can be found at http://virtualenvwrapper.readthedocs.org/en/latest/
Specific documentation on this feature can be found at
http://virtualenvwrapper.readthedocs.org/en/latest/command_ref.html?highlight=add2virtualenv
I modified my activate script to source the file .virtualenvrc
, if it exists in the current directory, and to save/restore PYTHONPATH
on activate/deactivate.
You can find the patched activate
script here.. It’s a drop-in replacement for the activate script created by virtualenv 1.11.6.
Then I added something like this to my .virtualenvrc
:
export PYTHONPATH="${PYTHONPATH:+$PYTHONPATH:}/some/library/path"
- Initialize your virtualenv
cd venv
source bin/activate
- Just set or change your python path by entering command following:
export PYTHONPATH='/home/django/srmvenv/lib/python3.4'
- for checking python path enter in python:
python
>> import sys
>> sys.path
You can create a .pth
file that contains the directory to search for, and place it in the {venv-root}/lib/{python-version}/site-packages
directory. E.g.:
cd $(python -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
echo /some/library/path > some-library.pth
The effect is the same as adding /some/library/path
to sys.path
, and remain local to the virtualenv
setup.
The answers here really confused me. I’m not sure if I’m missing something but I found pyvenv.cfg
at venv/pyvenv.cfg
the ENTIRE contents of that file was
home = C:UsersUser.pyenvpyenv-winversions3.10.7
include-system-site-packages = false
version = 3.10.7
all I did was change User
to NewUser
and that stopped the error
No Python at 'C:UsersUser.pyenvpyenv-winversions3.9.6python.exe'
But yeah, I wasted an hour on this when ctrl+shift+f solved it easily.