The slides on chained exceptions (feature 3) are missing one thing, I think. The "raise from" example is not really a way to "do this manually", but rather a wa

The slides on chained exceptions (feature 3) are missing one thing, I think. The "raise from" example is not really a way to "do this manually", but rather a way make explicit the relation between the two chained exceptions (as can be seen in the traceback messages), which is quite helpful. The first example says that one error occurred, we tried to handle it, but then another error occurred in the handling. E.g. "Failed to find eggs in refrigerator. Tried to buy eggs, but tripped and broke leg." The syntax in second example should be used when the exception in turn causes a larger process to fail, e.g. "Failed to make pancakes due to a failure to find eggs in refrigerator."