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A guide on effectively merging two Python functions that share similar logic but differ in input parameters. Learn how to streamline your code for better maintainability and readability.
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How to Combine Two Functions with Similar Logic in Python

In programming, particularly when working with Python, we often find ourselves in situations where we need to combine functions that share similar logic but take different input parameters. This can lead to code duplication which makes maintenance an uphill task. If you've ever faced this issue, you're not alone! In this guide, we'll explore a practical solution to combine two Python functions into one while maintaining flexibility and clarity.

The Problem

Consider this scenario where you have two functions that are intended for similar purposes but require different parameters. Here, we have:

create_data_file_removed_duplicate_item: This function requires a warehouse_name and a date.

create_data_file_without_duplicate_item: This function omits the warehouse_name and date altogether.

Both functions essentially perform the same task of removing duplicate items and outputting non-duplicate item data to a file. The challenge is to create a unified function without repeating code.

The Solution

To solve this problem, we can create a new function that accepts all necessary parameters with default values where appropriate. Let's break this down into a few clear steps:

Step 1: Define the Unified Function

We’ll define a new function called create_data_file_removed_duplicate_item which includes parameters for both use cases:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Handle Duplicates

Use the same logic to remove duplicates as in the original functions:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Construct the File Name Conditionally

Next, vary the file name based on whether warehouse_name is provided:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Save the Data

Combine the logic to save the data to the specified output directory:

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Optional Logging

If warehouse_name is not provided, log the data count after removing duplicates for transparency:

[[See Video to Reveal this Text or Code Snippet]]

Final Unified Function

Putting this all together, the combined function looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Combining functions with similar logic can greatly enhance the maintainability of your codebase. By using default parameters and conditional logic, you can streamline your functions and avoid unnecessary duplication. This practice not only makes your code cleaner but also easier to understand for those who might work on it in the future.

Whether you're working on a small project or a large application, taking the time to refine your function design pays off in the long run. Happy coding!