How to Capture stdout Output for Python Function Calls?

Capturing Stdout Output for Python Function Calls

When using libraries that log to stdout, capturing their output can provide insights into their behavior. This article explores a workaround to achieve stdout capture for arbitrary function calls in Python.

Context Manager Solution

To capture stdout output within specific code blocks, consider utilizing a context manager like the following:

To employ this context manager, simply wrap the function call:

The output variable will now contain a list of the lines printed by the function call.

Advanced Usage

The context manager can be used multiple times, and the results will be concatenated. For instance:

This will produce the output:

In Python 3.4 and above, contextlib.redirect_stdout() provides an alternative approach to redirecting stdout. However, the Capturing context manager offers the advantage of being both a list and a context manager.

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