Secuence is not cleared after operation completed

[3rdPix]

Describe the bug
When solving an operation and the result is displayed, it is possible to enter new number. These new numbers are appended at the end of the string representing the result and are not treated as new numbers. This causes conflicts after trying to add an operator and calculating new results.

To Reproduce
Steps to reproduce the behavior:

1. Write a number and calculate any operation
2. When the result is shown on screen, write new numbers. These numbers will be appended at the end of the shown result
3. Try to get the result by pressing enter
4. See error

Traceback (most recent call last):
  File "D:\gui_calculator\calculator_main.py", line 296, in equal
    temp_val1 = str(result)  # Store the result in temp_val1.
                    ^^^^^^
UnboundLocalError: cannot access local variable 'result' where it is not associated with a value

Expected behavior
It should be decided whether after solving an operation the result remains and can be used to work on new operations, or it should be cleared if new numbers are typed.

I acknowledge that I did not fully consider the scenario you mentioned while writing the code. I have also reviewed how the actual Windows calculator functions and will proceed to make adjustments accordingly. Thank you for bringing this issue to my attention

The issue you raised about the program terminating when only 'operand1 =' is entered is still being resolved. However, I have configured what should happen when only 'operand 1 operator =' is entered. Following the behavior of the Windows calculator, when 'operand 1 operator =' is entered, it is set up as if the value of operand 1 is also placed into operand 2.