# Updating to a new version¶

Before you update, take a look at the Release Notes, which lists the changes, fixes, and new stuff. Most importantly, it has a section on backwards incompatible changes (i.e., changes which may break your existing code) along with information how to fix it. Of course, we try to avoid introducing such incompatible changes, but sometimes, there’s no way around them. If you skip some intermediate version(s) for the update, read also the release notes of those!

How to update depends a little bit on the way you installed TeNPy. Of course, you have always the option to just remove the TeNPy files (possibly with a pip uninstall physics-tenpy or conda uninstall physics-tenpy), and to start over with downloading and installing the newest version.

## When installed with conda¶

When you installed TeNPy with [conda], you just need to activate the corresponding environment (e.g. conda activate tenpy) and do a:

conda update physics-tenpy


## When installed with pip¶

When you installed TeNPy with [pip], you just need to do a:

pip install --upgrade physics-tenpy


## When installed from source¶

If you used git clone ... to download the repository, you can update to the newest version using [git]. First, briefly check that you didn’t change anything you need to keep with git status. Then, do a git pull to download (and possibly merge) the newest commit from the repository.

Note

If some Cython file (ending in .pyx) got renamed/removed (e.g., when updating from v0.3.0 to v0.4.0), you first need to remove the corresponding binary files. You can do so with the command bash cleanup.sh.

Furthermore, whenever one of the cython files (ending in .pyx) changed, you need to re-compile it. To do that, simply call the command bash ./compile again. If you are unsure whether a cython file changed, compiling again doesn’t hurt.

To summarize, you need to execute the following bash commands in the repository:

# 0) make a backup of the whole folder
git status   # check the output whether you modified some files
git pull
bash ./cleanup.sh  # (confirm with 'y')
bash ./compile.sh