Complete task-9 Inheritance

Author: Konvaly

sprint-5-prep/9-inheritance.py

@@ -0,0 +1,67 @@
+class Parent:
+    def __init__(self, first_name: str, last_name: str):
+        self.first_name = first_name
+        self.last_name = last_name
+
+    def get_name(self) -> str:
+        return f"{self.first_name} {self.last_name}"
+
+
+class Child(Parent):
+    def __init__(self, first_name: str, last_name: str):
+        super().__init__(first_name, last_name)
+        self.previous_last_names = []
+
+    def change_last_name(self, last_name) -> None:
+        self.previous_last_names.append(self.last_name)
+        self.last_name = last_name
+
+    def get_full_name(self) -> str:
+        suffix = ""
+        if len(self.previous_last_names) > 0:
+            suffix = f" (née {self.previous_last_names[0]})"
+        return f"{self.first_name} {self.last_name}{suffix}"
+
+
+# --- Predictions ---
+
+person1 = Child("Elizaveta", "Alekseeva")
+
+print(person1.get_name())
+# Prediction: "Elizaveta Alekseeva"
+# Reason: Child inherits get_name() from Parent, no name change yet
+
+print(person1.get_full_name())
+# Prediction: "Elizaveta Alekseeva"
+# Reason: no previous last names, so suffix is empty string
+
+person1.change_last_name("Tyurina")
+# Saves "Alekseeva" into previous_last_names list, changes last_name to "Tyurina"
+
+print(person1.get_name())
+# Prediction: "Elizaveta Tyurina"
+# Reason: get_name() uses self.last_name which is now "Tyurina"
+
+print(person1.get_full_name())
+# Prediction: "Elizaveta Tyurina (nee Alekseeva)"
+# Reason: previous_last_names is not empty, so suffix shows the original last name
+
+person2 = Parent("Elizaveta", "Alekseeva")
+
+print(person2.get_name())
+# Prediction: "Elizaveta Alekseeva"
+# Reason: Parent has get_name(), works normally
+
+# print(person2.get_full_name())
+# Prediction: ERROR - AttributeError
+# Reason: Parent class does not have get_full_name() method, only Child does
+
+# person2.change_last_name("Tyurina")
+# Prediction: ERROR - AttributeError
+# Reason: Parent class does not have change_last_name() method, only Child does
+
+# print(person2.get_name())
+# Would print "Elizaveta Alekseeva" but we can't reach this line because of the error above
+
+# print(person2.get_full_name())
+# Would also error - Parent still doesn't have get_full_name()