How Can I Capture the Output of a Python Function Using a Context Manager?

Redirecting stdout to Capture Function Output

This question addresses the need to capture stdout output from a Python function, namely do_something(my_object), which modifies the object and prints statistics along the way.

To achieve this, a context manager class, Capturing, has been proposed. This class provides two key functions:

• __enter__(): Redirects stdout to an internal buffer.
• __exit__(): Restores stdout to its original target and appends the captured output to the class's list attribute.

Usage of the context manager is straightforward:

<code class="python">with Capturing() as output:
    do_something(my_object)</code>

At this point, the output variable will contain a list of the lines printed by do_something().

Additionally, it is noted that this technique can be used multiple times to capture output from different function calls. The results will be concatenated in the same output list.

This approach is particularly useful when the function being called cannot be modified to return the desired information.

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