Hello all,
In Python 3.10 and 3.11, exception tracebacks are being greatly improved. I
noticed that there's nothing related to a fairly common (in my personal
experience) cryptic traceback relating to the `with` statement:
>>> with ContextManager as ctx:
... # do something with `ctx`
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: __enter__
This occurs when one forgets to use a instance of a context manager class
and uses the class itself. It's obviously not a very helpful traceback.
("Is it not a context manager?" "Is it the wrong class?") Something like
the following would be better.
>>> with ContextManager as ctx:
... # do something with `ctx`
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: <type Context manager> is not a context manager. Did you
mean "with ContextManager()..."?
The actual traceback message should probably be more specific than "<type
Context manager> is not a context manager".
Thoughts?
--
Finn
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