Python can substitute an empty context manager without conditions inside!

It often happens that a resource needs to be opened via with, and sometimes the object is already ready and there's no need to open anything.

This usually leads to code duplication or conditions around with:

if need_open:
    f = open(...)
else:
    f = existing_file

`nullcontext(obj) behaves like an empty context manager and allows you to maintain a single execution flow.

This is especially useful for APIs, tests, optional resources, dependency injection, and functions that can accept both a path and a ready-made object.


with ctx as resource:
    process(resource)

But note that nullcontext() does not close the passed object — it simply passes it on further.

🔥 nullcontext() helps to unify scenarios with optional context managers and significantly simplifies the architecture of IO code.

#Python #ContextManager #CodingTips #DevLife #Programming #Tech

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Do you know that Python allows you to get all the object's attributes with one function without additional code? 🐍

When you need to quickly check the state of an object, many manually access the attributes or dig into __dict__.

But for this, Python already has a built-in function vars().

vars(obj)

It returns a dictionary of all the object's attributes, including the current state of the instance.

{'x': 10}

This is useful for debugging, logging, serialization, ORM, and analyzing the runtime state of objects.

print(vars(user))

Also, vars() works with modules, classes, and any objects with dict.


vars(module)


🔥 vars()` — a rather underrated tool for quickly analyzing the state of objects during execution.

#Python #Coding #Programming #Debugging #TechTips #DevLife

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