Скачать или смотреть How to Pass Arguments to a Function Passed as a Keyword Argument in Python

Learn how to effectively pass arguments to a function that is passed as a keyword argument in Python. This guide breaks down the steps to achieve the desired functionality in a clear and concise manner.
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This video is based on the question https://stackoverflow.com/q/63741108/ asked by the user 'Alfred Elkerbout' ( https://stackoverflow.com/u/4511897/ ) and on the answer https://stackoverflow.com/a/63741409/ provided by the user 'alani' ( https://stackoverflow.com/u/13596037/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Function Arguments: Passing to Functions Passed as Keyword Arguments in Python

Handling functions in Python can sometimes be tricky, especially when it comes to passing arguments effectively. A common challenge developers face is how to pass arguments to a function that itself has been passed as a keyword argument (kwarg). In this guide, we will dive into a practical example to clarify the process and provide a clear solution.

The Problem: Passing Arguments to a Function Inside a Class

Let’s consider a specific scenario where we have a class that runs a function in a separate thread. The function has been passed as a keyword argument, but we need to pass additional arguments to it. The provided code snippet demonstrates this problem:

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The Expected Output vs. Actual Output

When you run the code, you'll notice that the expected output does not match what you get. Instead of passing the func_kwargs_inner, the function leverages hard-coded values resulting in the following output:

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The goal is to adjust the code so that it prints the desired output:

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The Solution: Passing Arguments Correctly

Upon reviewing the code, we can see the main issue is that the arguments are not being passed correctly. Here’s how to fix it:

Step 1: Modify the run Method

In the run method of the TestClass, instead of calling func() without arguments, we need to pass func_kwargs_inner. Change the line:

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to:

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Step 2: Adjust the main Function

Next, we need to modify the main function. Instead of using a lambda function to wrap around func(func_kwargs), we can directly pass func:

Change:

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To:

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Full Revised Code

After making these adjustments, your complete code snippet should look like this:

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The Result

Running the revised code will produce the expected output:

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Conclusion

With these modifications, you should now have a clearer understanding of how to pass arguments to a function that is passed as a kwarg. By ensuring you pass the correct parameters when calling the function, you can resolve similar issues in your own projects. Happy coding!