When I use 'pip' to install packages, even if the package has already been installed, it will continue to install, instead of showing the prompt of 'Requirements already satisfied'.
But when I try to install with 'sudo pip', this prompt will come up and the package will not be installed.
I am not using any virtual environment, but the pip that comes with the ubuntu system. So how does pip check installed packages and how to fix this problem?
Thanks in advance.
Related
On Windows, if you try to use pip to upgrade itself, inside a virtualenv, you may get a mysterious "access is denied" error. For instance:
D:\scratch\> C:\Program Files\Python\3.7.4\x64\python.exe -m venv D:\scratch\my-venv
D:\scratch\> D:\scratch\my-venv\Scripts\activate
(my-venv) D:\scratch\> pip install --upgrade pip
Collecting pip
Downloading pip-19.3.1-py2.py3-none-any.whl (1.4MB)
Installing collected packages: pip
Found existing installation: pip 19.0.3
Uninstalling pip-19.0.3:
Could not install packages due to an EnvironmentError:
[WinError 5] Access is denied: 'd:\\scratch\\my-venv\\scripts\\pip.exe'
Consider using the `--user` option or check the permissions.
This happens whether or not the command prompt has administrative privileges.
We know we have write access to everything inside d:\scratch\my-venv, because we just created it with the initial python -m venv command. The advice to use the --user option is unhelpful, since we want to upgrade the version of pip inside the virtualenv, which --user will not do.
What could be wrong, and what is the correct way to upgrade pip inside a virtualenv on Windows?
I don't know if this is the only reason this can happen, but notice that the "Access is denied" error points at d:\scratch\my-venv\scripts\pip.exe. pip is trying to replace itself, and Windows doesn't allow you to modify a running EXE file in any way.
A workaround for this specific problem is to use python -m pip install --upgrade pip instead. This way, pip.exe is not running, so Windows will allow it to be replaced. This action doesn't try to overwrite d:\scratch\my-venv\scripts\python.exe, and Windows doesn't care what pip does to all the other files belonging to the pip package.
See https://github.com/pypa/pip/issues/188 and https://github.com/pypa/pip/issues/1299 for further information.
You must have the same version of pip installed in windows as in the virtual env. I think that is the reason for the error Access Denied in Virtual Env.
in promt,
python -m pip install --upgrade pip
located in the Scripts folder of the virtual env, execute the update command upgrade pip in venv
I would have put this in a comment to zwol's answer, but I don't have enough reputation yet.
I just wanted to add to anyone else potentially coming across this from google like I did, that python -m pip install --upgrade pip did fix this issue for me. However if you try pip install --upgrade pip before doing that, something happens in the process before you hit the access denied error that messes up pip. I personally was getting ModuleNotFoundError: No module named 'pip' after trying to upgrade the normal way.
Once I deleted and restarted my virtualenv and had the first command be python -m pip install --upgrade pip It worked just fine.
I hope that helps other newbies out there struggling like me! :)
Same error for me, but in both conditions: my system pip and virtualenv pip. So, when I tried to upgrade my system pip, hopefully it wasn't like totally deleted, I could still use the "pip" command. However I know the upgrade system pip failed. When I tried the command again, it said pip was on the latest version. Maybe this is just a glitch. I believe it is the same for virtual environments(virtualenv, venv). When I upgrade the system pip I get this error:
ERROR: Could not install packages due to an OSError: [WinError 5] Access is denied: 'C:\\Users\\heewo\\AppData\\Local\\Temp\\pip-uninstall-8ob_krif\\pip.exe'
Consider using the `--user` option or check the permissions.
I know this is not normal. But still, different than the virtualenv, "pip" is still installed. I believe this is still ignorable as this is just a known issue and most people here know about this topic. For me, python -m pip install --upgrade pip did not work in this state.
I tried this method, and this did work for me.
virtualenv --pip [VERSION]
and replace VERSION with the latest version available on pip. This prints out that what version you are attempting to upgrade to, when you get the error.
And that should do the trick.
Hey everyone I installed Python3.9 on my Mac using homebrew package manager but now I do not know how to install packages to it for use
Can anyone please tell me, thanks !
You should first do some research on the Python virtual environment, but the final answer to your question is to use pip install for installing Python packages. Be aware that there are other options out there, but pip is the most prevalent.
When you installed python, it has pip installed by default. pip comes with python. You can check pip version by
pip --version
OR
pip3 --version
Now, in order to install any other package, you can install by
pip install <package-name>
It would be better if you install a virtual environment, and install all other packages inside the virtual environment so that you can install packages according to your project requirements and with different versions.
To install virtual environment, do
pip install virtualenv
Once the virtual environment is installed, you can create your virtualenv according to your project requirement by:
virtualenv -p python3 venv
Here venv is your virtualenv name. To activate it,
source venv/bin/actiavte
Now, you can install all your required packages inside this virtualenv by pip3 install <package-name>. This will keep it separated from your system environment.
After performing a system upgrade this morning, I'm not able to install or update packages in any of my old or fresh created virtual environments.
I create the virtual environments using virtualenvwrapper.
I've tried rebooting my PC, recreating all of my virtual environments, but nothing worked.
Strange enough, pip freeze does not output my installed packages, although they are found in sitepackages.
Im using python3.7 on manjaro linux with the newest kernel.
In my envs and on my system pip 19.2.3 is installed.
The error I'm seeing is the following:
pip install <package>
ERROR: Can not perform a '--user' install. User site-packages are not visible in this virtualenv.
When trying to use the system pip without virtualenv, everything works just fine.
pip install cython
Requirement already satisfied: cython in /home/manuel/.local/lib/python3.7/site-packages (0.29.13
I expect pip to install the desired package to the sitepackages folder of my virtualenv without telling me to not use a '--user' install, which I'm not doing explicitly anyway
I was able to fix this myself.
I checked all the pip config files here https://pip.pypa.io/en/latest/user_guide/#configuration
Seems like in the pip configuration file /etc/pip.conf the user parameter was set to true.
Changing it to false resolved my issue.
I still don't know why/if the config file changed.
When I run pip install django-pgjsonb as a regular user it fails with setuptools must be installed to install from a source distribution.
But setuptools is installed as can be seen from the fact that pip list includes the following packages:
Django (1.8.4)
pip (7.1.2)
setuptools (18.3.2)
wheel (0.24.0
Any ideas what the error is?
UPDATE I cannot reproduce the problem in a fresh venv. So I'm just recreating a venv with the same stuff.
However I'm leaving the question open in case anyone has anything to fix.
Once you have activated a virtual environment try the following. It worked for me.
pip install --user -Iv django-pgjsonb
I was able to install pip by using distribute_setup.py and get-pip.py. However, I had to add pip to path by adding C:\Python27\Scripts.
This worked for a little while but I had to do a system restore for other reasons and now when I type pip in the command prompt it returns: 'pip' is not recognized as an internal or external command.
I tried adding C:\Python27\Scripts to path again both to the user variable and system variable but to no avail. I also tried re-installing pip but it just said I had the latest version installed already. Pip can be imported without any error within python so I am at a loss here. Can anyone help?
Thanks in advance.
Try using easy_install
easy_install -U pip
This will remove pip.
If you don't have easy_install ... installed, do that first.
After uninstalling pip, simply reinstall it using the get-pip.py file.