Installing specific package versions with pip

Question

I m trying to install version 1 2 2 of the MySQL python adaptor  using a fresh virtualenv created with the --no-site-packages option  The current version shown in PyPi is 1 2 3  Is there a way to install the older version  I found an article stating that this should do it   pip install MySQL python  1 2 2   When installed  however  it still shows MySQL python-1 2 3-py2 6 egg-info in the site packages  Is this a problem specific to this package  or am I doing something wrong

User · Answer

To install a specific python package version whether it is the first time, an upgrade or a downgrade use:

pip install --force-reinstall MySQL_python==1.2.4

MySQL_python version 1.2.2 is not available so I used a different version. To view all available package versions from an index exclude the version:

pip install MySQL_python==

User · Answer

Since this appeared to be a breaking change introduced in version 10 of pip  I downgraded to a compatible version   pip install  pip lt 10     This command tells pip to install a version of the module lower than version 10  Do this in a virutalenv so you don t screw up your site installation of Python

User · Answer

This below command worked for me   Python version - 2 7  package - python-jenkins  command -   pip install  python-jenkins gt  1 1 1

User · Answer

One way  as suggested in this post  is to mention version in pip as   pip install -Iv MySQL python  1 2 2   i e  Use    and mention the version number to install only that version  -I  --ignore-installed ignores already installed packages

User · Answer

I recently ran into an issue when using pip s -I flag that I wanted to document somewhere   -I will not uninstall the existing package before proceeding  it will just install it on top of the old one   This means that any files that should be deleted between versions will instead be left in place   This can cause weird behavior if those files share names with other installed modules   For example  let s say there s a package named package   In one of packages files  they use import datetime   Now  in package 2 0 0  this points to the standard library datetime module  but in package 3 0 0  they added a local datetime py as a replacement for the standard library version  for whatever reason      Now lets say I run pip install package  3 0 0  but then later realize that I actually wanted version 2 0 0   If I now run pip install -I package  2 0 0  the old datetime py file will not be removed  so any calls to import datetime will import the wrong module   In my case  this manifested with strange syntax errors because the newer version of the package added a file that was only compatible with Python 3  and when I downgraded package versions to support Python 2  I continued importing the Python-3-only module   Based on this  I would argue that uninstalling the old package is always preferable to using -I when updating installed package versions

User · Answer

There are 2 ways you may install any package with version - A   pip install -Iv package-name    version B   pip install -v package-name    version  For A  Here  if you re using -I option while installing when you don t know if the package is already installed   like  pip install -Iv pyreadline    2    or something   you would be installing a new separate package with the same existing package having some different version   For B   At first  you may want to check for no broken requirements   pip check   2 and then see what s already installed by  pip list  3 if the list of the packages contain any package that you wish to install with specific version then the better option is to uninstall the package of this version first  by  pip uninstall package-name  4 And now you can go ahead to reinstall the same package with a specific version  by pip install -v package-name  version e g  pip install -v pyreadline    2

User · Answer

If you want to update to latest version and you don t know what is the latest version you can type   pip install MySQL python --upgrade  This will update the MySQL python for latest version available  you can use for any other package version

User · Answer

Sometimes  the previously installed version is cached       pip install pillow  5 2 0   It returns the followings      Requirement already satisfied  pillow  5 2 0 in  home ubuntu anaconda3 lib python3 6 site-packages  5 2 0   We can use --no-cache-dir together with -I to overwrite this     pip install --no-cache-dir -I pillow  5 2 0

User · Answer

TL DR    pip install -Iv  i e  pip install -Iv MySQL python  1 2 2    First  I see two issues with what you re trying to do  Since you already have an installed version  you should either uninstall the current existing driver or use pip install -I MySQL python  1 2 2  However  you ll soon find out that this doesn t work  If you look at pip s installation log  or if you do a pip install -Iv MySQL python  1 2 2 you ll find that the PyPI URL link does not work for MySQL python v1 2 2  You can verify this here  http   pypi python org pypi MySQL-python 1 2 2  The download link 404s and the fallback URL links are re-directing infinitely due to sourceforge net s recent upgrade and PyPI s stale URL   So to properly install the driver  you can follow these steps   pip uninstall MySQL python pip install -Iv http   sourceforge net projects mysql-python files mysql-python 1 2 2 MySQL-python-1 2 2 tar gz download

User · Answer

I believe that if you already have a package it installed  pip will not overwrite it with another version   Use -I to ignore previous versions

User · Answer

You can even use a version range with pip install command  Something like this   pip install  stevedore gt  1 3 0  lt 1 4 0    And if the package is already installed and you want to downgrade it add --force-reinstall like this   pip install  stevedore gt  1 3 0  lt 1 4 0  --force-reinstall

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