Upgrading to a new Morepath versionΒΆ

Morepath keeps a detailed changelog (CHANGES) that describes what has changed in each release of Morepath. You can learn about new features in Morepath this way, but also about things in your code that might possibly break. Pay particular attention to entries marked Breaking change, Deprecated and Removed.

Breaking change means that you have to update your code as described if you use this feature of Morepath.

Deprecated means that your code won’t break yet but you get a deprecation warning instead. You can then upgrade your code to use the newer APIs. You can show deprecation warnings by passing the following flag to the Python interpreter when you run your code:

$ python -W error::DeprecationWarning

If you use an entry point to create a command-line tool you will have to supply your Python interpreter manually:

$ python -W error::DeprecationWarning the_tool

You can also turn these on in your code:

import warnings
warnings.simplefilter('always', DeprecationWarning)

It’s also possible to turn deprecation warnings into an error:

import warnings
warnings.simplefilter('error', DeprecationWarning)

A Deprecated entry in the changelog changes into a Removed in a future release; we are not maintaining deprecation warnings forever. If you see a Removed entry, it pays off to run your code with deprecation warnings turned on before you upgrade to this version.