I've come across situations where a current version of a package seems not to be working and requires reinstallation. But pip install -U won't touch a package that is already up-to-date. I see how to force a reinstallation by first uninstalling (with pip uninstall) and then installing, but is there a way to simply force an "update" to a nominally current version in a single step?
pip install --upgrade --force-reinstall <package>
When upgrading, reinstall all packages even if they are already up-to-date.
pip install -I <package>
pip install --ignore-installed <package>
Ignore the installed packages (reinstalling instead).
You might want to have all three options: --upgrade and --force-reinstall ensures reinstallation, while --no-deps avoids reinstalling dependencies.
$ sudo pip install --upgrade --no-deps --force-reinstall <packagename>
Otherwise you might run into the problem that pip starts to recompile Numpy or other large packages.
sudo was crucial in my case.
--upgrade when we use --force-reinstall?
sudo to install for all users. Don't run sudo with --user as that will install packages under root user only.
If you want to reinstall packages specified in a requirements.txt file, without upgrading, so just reinstall the specific versions specified in the requirements.txt file:
pip install -r requirements.txt --ignore-installed
--upgrade --force-reinstall
doesn't appear to force reinstall using python2.7 with pip-1.5
I've had to use
--no-deps --ignore-installed
--upgrade in addition to --force-reinstall, or it won't have any effect.
In the case you need to force the reinstallation of pip itself you can do:
python -m pip install --upgrade --force-reinstall pip
sudo pip3 install --upgrade --force-reinstall --no-deps --no-cache-dir <package-name>==<package-version>
Some relevant answers:
Difference between pip install options "ignore-installed" and "force-reinstall"
If you have a text file with loads of packages you need to add the -r flag
pip install --upgrade --no-deps --force-reinstall -r requirements.txt
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using cachedjust means it uses source files that where cached on the last install. To force re-download use the--no-cache-dirflag.pip install -U, for short. (and the--force-reinstalloption is rarely necessary)--no-depsto avoid that, as suggested in Finn’s answer below.