Let’s Fix Bloated Python Classes Once and For All
ArjanCodes
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This class looks clean… until it quietly turns into a God object.
In this video, I refactor a real Python example step by step, showing how one class slowly takes on too many responsibilities. From validation to data processing to model training. Then I break it apart into smaller, clearer pieces and introduce a simple rule of thumb for deciding what belongs in a class and what doesn’t.
???? GitHub Repository: https://git.arjan.codes/2026/god.
???? ArjanCodes Courses: https://www.arjancodes.com/courses.
???? Join my Discord server: https://discord.arjan.codes.
⌨️ Keyboard I’m using: https://amzn.to/49YM97v.
???? Chapters:
0:00 Intro
1:54 The Starting Point
4:10 Step 1: Move Validation Close to the Data
6:54 Step 2: Split Loading and Cleaning
8:02 Step 3: Split Feature Preparation Into Smaller Steps
9:06 Step 4: Move the Remaining Workflow Out of the Class
11:28 Step 5: Keep the Class for What It’s Good At
12:13 Why This Refactor Works
14:37 Final Thoughts
#arjancodes #softwaredesign #python
This class looks clean… until it quietly turns into a God object.
In this video, I refactor a real Python example step by step, showing how one class slowly takes on too many responsibilities. From validation to data processing to model training. Then I break it apart into smaller, clearer pieces and introduce a simple rule of thumb for deciding what belongs in a class and what doesn’t.
???? GitHub Repository: https://git.arjan.codes/2026/god.
???? ArjanCodes Courses: https://www.arjancodes.com/courses.
???? Join my Discord server: https://discord.arjan.codes.
⌨️ Keyboard I’m using: https://amzn.to/49YM97v.
???? Chapters:
0:00 Intro
1:54 The Starting Point
4:10 Step 1: Move Validation Close to the Data
6:54 Step 2: Split Loading and Cleaning
8:02 Step 3: Split Feature Preparation Into Smaller Steps
9:06 Step 4: Move the Remaining Workflow Out of the Class
11:28 Step 5: Keep the Class for What It’s Good At
12:13 Why This Refactor Works
14:37 Final Thoughts
#arjancodes #softwaredesign #python
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