Repository navigation
repr () not used in window displays (Issue #1661 continued) #114
Description
Activity
This is something that really should be tackled on the Python side of things, because it's a problem that affects all IDEs (and really anything that has to visualize Python data structures). This is not a trivial design issue, because such a hook needs to allow objects to coordinate - e.g. in your case you don't want to apply nesting limitations, but other collections might.
OTOH if Python does it, it can be designed much more flexibly than our implementation - for example, instead of expecting the repr to return the value, it can supply a builder object with methods to append text, and to recursively invoke repr on a contained value; and the builder can then keep track of things like nesting level or number of elements rendered. The stdlib collections could then also implement it properly.
Brett Cannon (@brettcannon), is that something that would be PEP-worthy? The gist is to have a form of
repr()that can limit the size of the output, for cases like collections of thousands of elements, or lists that nest so deeply that you get too many[...].Pavel Minaev (@int19h) you could propose it on python-ideas and see if people are positive on the idea.
- locked and limited conversation to collaborators
on Feb 1, 2023
In safe_repr.py, ptvsd estimates whether repr (obj) might be too long to send to the IDE. In my code, I have a class derived from list, and if I have more than two levels of nesting, it is considered too long.
Please consider the following solution: If the obj being displayed has a method called 'safe_repr', then this is called directly. I put the following in my local copy of safe_repr.py:
def call(self, obj):
The name 'safe_repr' is something I made up. You might want to provide some other way to tell SafeRepr (obj) that repr (obj) is OK to use.
Environment data