Update README.md

Author: josemoracard

exercises/043-inheritance_and_polymorphism/README.md

@@ -1,4 +1,4 @@
-# `043` inheritance and polymorphism
+# `043` Inheritance and polymorphism
 
 Now that we understand what a class is and some of its characteristics, let's talk about two new concepts related to classes: inheritance and polymorphism. Consider the following example:
 
@@ -9,12 +9,12 @@ class HighSchoolStudent(Student):  # Add the parent class inside the parenthesis
         self.specialization = specialization
 
     def study(self, hours):
-        print(f"{self.name} is a high school student specializing in {self.specialization} and is studying for {hours} hours for exams.")
+        return f"{self.name} is a high school student specializing in {self.specialization} and is studying for {hours} hours for exams."
 
 # Creating an instance of HighSchoolStudent
 high_school_student = HighSchoolStudent("John", 16, 85, "Science")
-high_school_student.introduce()  # We can call this method thanks to inheritance 
-high_school_student.study(4)  # This method has been slightly modified and now it prints a different string
+print(high_school_student.introduce())  # We can call this method thanks to inheritance 
+print(high_school_student.study(4))  # This method has been slightly modified and now it returns a different string
 ```
 
 Assuming that the `Student` class from the previous exercise is coded just above this `HighSchoolStudent` class, to inherit its methods and attributes, we simply include the name of the class we want to inherit from (the parent class) inside the parentheses of the child class (`HighSchoolStudent`). As you can see, we can now use the `introduce` method from the `Student` class without having to code it again, making our code more efficient. The same applies to attributes; we don't need to redefine them.
@@ -27,13 +27,13 @@ Additionally, we have the flexibility to add new methods exclusively for this cl
 
 2. Add a new attribute called `major` to represent the major they are studying.
 
-3. Modify the inherited `introduce` method to print this string:
+3. Modify the inherited `introduce` method to return this string:
 
 ```py
 "Hi there! I'm <name>, a college student majoring in <major>."
 ```
 
-4. Add a new method called `attend_lecture` that prints the following string:
+4. Add a new method called `attend_lecture` that returns the following string:
 
 ```py
 "<name> is attending a lecture for <major> students."