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Tag: contextmanager

Can we mix contextmanager decorator with __enter__() and __exit__() methods in another class inside the same with statement?

In python3.8 I’m very familiar with the traditional __enter__ and __exit__ magic methods but new to the @contextlib.contextmanager decorator. Is it possible to mix the two patterns inside a single with statement? The following (highly contrived) script should explain the problem more clearly. Is there a definition of ContextClass.enter_context_function() and ContextClass.exit_context_function() (I imagine something needs to change inside __init__ as

Conditional or optional context managers in with statement

Suppose I have some kind of context manager (from a third-party library) that I am using like so: But, suppose if there is no value for test_dt, the context manager should not run, but all of the remaining code should run, like so: Assume that lines_of_code here is 2-3 lines of code which are exactly identical, is there a cleaner

Why can’t a module be a context manager (to a ‘with’ statement)?

Suppose we have the following mod.py: and the following use of it: I get an error: According to the documentation the documentation the with statement should execute as follows (I believe it fails at step 2 and therefore truncate the list): The context expression (the expression given in the with_item) is evaluated to obtain a context manager. The context manager’s

Python How to force object instantiation via Context Manager?

I want to force object instantiation via class context manager. So make it impossible to instantiate directly. I implemented this solution, but technically user can still instantiate object. And context manager: Any better solution ? Answer If you consider that your clients will follow basic python coding principles then you can guarantee that no method from your class will be

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