How can I use pytest for memory testing in my Python application?

How can I use pytest for memory testing in my Python application?

You can use the pytest framework along with the memory_profiler package to test memory usage. First, install memory_profiler using pip.

What are the steps to install memory_profiler?

You can install it by running pip install memory_profiler in your terminal. After that, you can use the @profile decorator to mark the functions you want to test.

Can you show me an example of how to use the @profile decorator?

Sure! Here’s a simple example:

from memory_profiler import profile

@profile
def my_function():
    a = [1] * (10 ** 6)  # allocate a large list
    b = [2] * (2 * 10 ** 7)  # allocate a larger list
    del b  # delete b to free memory
    return a

You can run this with pytest to see the memory usage.

How do I run the tests to see the memory usage?

You can run your tests with the command pytest --memory-profiler in your terminal. This will show you the memory usage for each decorated function.