在本地安装 pip3 包

Question

Having used npm for some time, I'm struggling to understand why pip3 (ie: pip with Python 3) is so stubborn when it comes to manage permissions.

So far, I've been using pip3 with sudo as I'm the only one using this computer and I don't mind installing packages globally

Today I wanted to install the pep8 package and use it locally without sudo. pep8 can be used by IDEs and they would not be able to use it without sudo. Therefore, I'd like to run

pip3 install --user pep8

However, command doesn't work without sudo. Console throws a traceback with a PermissionError:

PermissionError: [Errno 13] Permission denied: '/usr/lib/python3.4/site-packages/pip/__init__.py'

And if run with sudo, quite logically, pep8 is installed in /root

With 2.7, the workaround is to uninstall pip and then reinstall it locally with --user. At the moment, though, I'm unable to uninstall pip3. At least in Fedora 22, dependencies seem to be quite tight. My guess is that pip3 comes bundled with 3.4 and that makes matters worse.

And so, running

python3 get-pip.py --user

gives a permission error because the script looks at current pip3 installations. If I run the command with sudo, the --user works (I believe it's still in testing mode?) but, logically, it installs it in the /root folder

In short, is there a way to use pip with Python3 to install packages locally?

Answer 1

Within a console start your version of python you want to install the package for. Run the python with the permission you want it to be installed with. Python 3 and without sudo in this case.

python3

Thank in the python instance install the package you want.

import pip

#Ininstall the package
#This is the path to the setup and unzipped package. Path to the folder with setup.py.
path_to_setup = "/usr/lib/python3.4/site-packages/pep8"
#finelly runs the installation
pip.main (['install', path_to_setup])
#You will see some data processed.
#Now test it. In this case the package is pep8
import pep8