Added History Button

[HappyLife2]

Calculator History Feature Implementation

Enhanced the calculator project by introducing a Calculation History feature, allowing users to access and recall previous calculations.

Changes Made:

1. History Initialization:

   • Added self.history variable to store calculation history.

2. History Storage:

   • Modified _get_data_in_input method to save calculations in history.

3. Show History Method:

   • Implemented show_history to display history in a dedicated window.

4. Integration with UI:

   • Connected show_history method to a "Show History" button.

Summary:

Users can now review and recall their last 10 calculations using the "Show History" button, enhancing usability and overall user experience.