How can I upgrade specific packages using pip and a requirements file

Question

I m using pip with a requirements file  in a virtualenv  for my Django projects   I m trying to upgrade some packages  notably Django itself  and I m getting an error about source code conflicts   Source in  lt virtualenv gt  build Django has version 1 2 3 that conflicts with Django  1 2 4  from -r requirements apps txt  line 3    That s after updating the version number of Django from 1 2 3 to 1 2 4 in my requirements file   I m using this command to actually do the upgrade  pip --install --upgrade -E   lt virtualenv dir  gt  --requirement   lt requirements file  gt   I can t find any flag that triggers a total package re-download   I even tried running an uninstall command first  and then the install  but no dice  Am I missing something

User · Answer

If you only want to upgrade one specific package called somepackage, the command you should use in recent versions of pip is

pip install --upgrade --upgrade-strategy only-if-needed somepackage

This is very useful when you develop an application in Django that currently will only work with a specific version of Django (say Django=1.9.x) and want to upgrade some dependent package with a bug-fix/new feature and the upgraded package depends on Django (but it works with, say, any version of Django after 1.5).

The default behavior of pip install --upgrade django-some-package would be to upgrade Django to the latest version available which could otherwise break your application, though with the --upgrade-strategy only-if-needed dependent packages will now only be upgraded as necessary.

User · Answer

First make sure you have checked the most voted answer   I m not sure if it s exactly your problem  but in my case  I wasn t able to upgrade Django to 1 2 4 - I was always finishing with 1 2 3 version  so I uninstalled Django with   lt virtualenv gt  bin pip uninstall Django  Then I removed  lt virtualenv gt  build Django directory and finally I installed the proper version with   lt virtualenv gt  bin pip install Django

User · Answer

If you upgrade a package  the old one will be uninstalled  A convenient way to do this is to use this pip-upgrader which also updates the versions in your requirements txt file for the chosen packages  or all packages   Installation pip install pip-upgrader  Usage Activate your virtualenv  important  because it will also install the new versions of upgraded packages in current virtualenv   cd into your project directory  and then run  pip-upgrade  Advanced usage If the requirements are placed in a non-standard location  send them as arguments  pip-upgrade path to requirements txt  If you already know what package you want to upgrade  simply send them as arguments  pip-upgrade -p django -p celery -p dateutil  If you need to upgrade to  pre-release   post-release version  add --prerelease argument to your command  Full disclosure  I wrote this package

User · Answer

This solved the issue for me  pip install -I --upgrade psutil --force  Afterwards just uninstall psutil with the new version and hop you can suddenly install the older version

User · Answer

I ran the following command and it upgraded from 1 2 3 to 1 4 0  pip install Django --upgrade   Shortcut for upgrade   pip install Django -U   Note  if the package you are upgrading has any requirements this command will additionally upgrade all the requirements to the latest versions available   In recent versions of pip  you can prevent this behavior by specifying --upgrade-strategy only-if-needed   With that flag  dependencies will not be upgraded unless the installed versions of the dependent packages no longer satisfy the requirements of the upgraded package

User · Answer

The shortcut command for --upgrade   pip install Django --upgrade   Is   pip install Django -U

User · Answer

Normally  pip will clean up after itself and remove the contents of the build directory  The only time it doesn t do this is if    You used the --no-install option You are using editable packages The installation was cancelled or was otherwise interrupted    In all other cases  you shouldn t have build directory that s clogging your environment

User · Answer

According to pip documentation example 3  pip install --upgrade django  But based on my experience  using this method will also upgrade any package related to it  Example  Assume you want to upgrade somepackage that require Django  gt   1 2 4 using this kind of method it will also upgrade somepackage and django to the newest update  Just to be safe  do    Assume you want to keep Django 1 2 4 pip install --upgrade somepackage django  1 2 4  Doing this will upgrade somepackage and keeping Django to the 1 2 4 version

User · Answer

I use this    pip3 install -r  requirements txt

User · Answer

Defining a specific version to upgrade helped me instead of only the upgrade command  pip3 install larapy-installer  0 4 01 -U

[django] How can I upgrade specific packages using pip and a requirements file?

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