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working_with_python [2020/10/05 10:32]
lenocil [Example: how to create a python environment module]
working_with_python [2020/12/22 14:06] (current)
jansen
Line 81: Line 81:
     export PYTHONUSERBASE=$HOME/.local-rhel7     export PYTHONUSERBASE=$HOME/.local-rhel7
   fi   fi
-For users of the ''tcsh'' shell, add this to your .cshrc in stead:+For users of the ''tcsh'' shell, add this to your .tcshrc in stead:
   if (! -f /etc/fedora-release) then   if (! -f /etc/fedora-release) then
     setenv PYTHONUSERBASE $HOME/.local-rhel7     setenv PYTHONUSERBASE $HOME/.local-rhel7
Line 138: Line 138:
 virtualenv --help virtualenv --help
 </code> </code>
 +
 ==== METHOD 3: easy_install with the `--user' option ==== ==== METHOD 3: easy_install with the `--user' option ====
 Easy Install is a python module (easy_install) that lets you automatically download, build, install, and manage Python packages.  Easy Install is a python module (easy_install) that lets you automatically download, build, install, and manage Python packages. 
Line 155: Line 156:
 python -m easy_install --help python -m easy_install --help
 </code> </code>
 +
 +==== Migrating packages between python versions ====
 +Another issue when using personal installs may arrise on operating system upgrades, when a newer version of python is made the default (eg, moving from python 3.7 to python 3.9).
 +Notes copied from the [[https://docs.fedoraproject.org/en-US/fedora/f33/release-notes/developers/Development_Python/#_notes_on_migrating_user_installed_pip_packages|Fedora release notes]]:
 +  - Make a list of installed packages in the old python version:
 +<code bash>  
 +  python3.7 -m pip freeze > installed.txt 
 +</code>
 +  - Reinstall for the current python version:
 +<code bash>
 +  python3.9 -m pip install --user -r installed.txt
 +</code>
 +  - Optionally, uninstall the packages from the old python version and/or remove the obsolete directory under $HOME/.local/lib/python3.7
 ===== Example: how to let python search arbitrary library paths  ===== ===== Example: how to let python search arbitrary library paths  =====
 For instance for python v2.7 installations, create or edit For instance for python v2.7 installations, create or edit
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 ====== Anaconda/Miniconda ====== ====== Anaconda/Miniconda ======
 Another way of using a private python install (separate versions etc), is to install and use [[conda|Anaconda/Miniconda]]. Since these environments can encompass much more than just python, they deserve their own page (especially since they come with their own share of pitfalls). Another way of using a private python install (separate versions etc), is to install and use [[conda|Anaconda/Miniconda]]. Since these environments can encompass much more than just python, they deserve their own page (especially since they come with their own share of pitfalls).
 +
 +
 +====== Jupyter Notebooks ======
 +Depending on your operating system (Fedora or RedHat) you might get a different python kernel version as the standard kernel. If you get ''python2'' as the default kernel and only option, but wish the use the ''python3'' kernel you need to add this kernel to you local environment. This can be done by executing:
 +    python3 -m ipykernel install –user
 +Once this command has run successfully, it will have installed python3 as a jupyter kernel.
 +
 +After starting ''jupyter notebook'' you can select ''python3'' as kernel.
working_with_python.1601893970.txt.gz · Last modified: 2020/10/05 10:32 by lenocil