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calculator-exercise/Files for Students/Student 3/Student 3/model.py

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+# model.py
+
+from pycalc.constants import *
+
+# Simple "model" to handle calculator functionality
+# This function just uses the Python "eval()" function
+# to evaluate the expression entered.
+def evaluateExpression(expression):
+    """
+    Evaluate the given mathematical expression and return the result.
+
+    This function takes a mathematical expression as input, evaluates it using the `eval()` function,
+    and returns the result as a string. If an error occurs during evaluation, it returns an error message.
+
+    Args:
+        expression (str): The mathematical expression to evaluate.
+
+    Returns:
+        str: The result of the evaluation as a string, or an error message if evaluation fails.
+    """
+    try:
+        result = str(eval(expression, {}, {}))
+    except:
+        result = ERROR_MSG
+
+    return result

calculator-exercise/Files for Students/Student 3/Student 3/pycalc.py

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+#!/usr/bin/env python3
+
+# calc.py
+# https://realpython.com/python-pyqt-gui-calculator/
+
+""" Simple calculator built with Python and PyQt5 library """
+
+import os
+import sys
+
+from .view import PyCalcUi
+from .controller import PyCalcCtrl
+from .model import evaluateExpression
+
+from PyQt5.QtCore import Qt
+from PyQt5.QtWidgets import QApplication
+
+__version__ = "0.1"
+__author__ = "Tim Jones"
+
+def main():
+    """
+    Main application entry point.
+
+    This function serves as the entry point for the calculator application. It initializes the
+    calculator GUI, creates instances of the model and controller, and starts the application's main loop.
+
+    Args:
+        None
+
+    Returns:
+        None
+    """
+    calc = QApplication(sys.argv)
+    view = PyCalcUi()   # Render calculator GUI
+    view.show()         # Display calculator GUI
+    model = evaluateExpression          # Create instance of model
+    PyCalcCtrl(model=model, view=view)  # Create instance of controller
+    sys.exit(calc.exec_())    # Execute application main loop
+
+if __name__ == "__main__":
+    main()