Add some examples to functions

Defining_funtions.py

@@ -2,4 +2,30 @@ def hello(name):
     print(f'Hello {name}! How are you?')
 
 username = input('What is your name stranger?\n>')
-hello(username)
+hello(username)
+
+# Another example using functions and return code:
+
+import random
+
+# Defining the function:
+def get_answer(answer):
+    if answer <10:
+        return "The answer is smaller than 10"
+    elif answer == 10:
+        return "The answer is 10."
+    else:
+        return 'The answer is greater than 10'
+
+# Generating a random number, using that random number to define a variable by using it as an argument in the funtion,
+# and printing the result:
+random_number = random.randint(1, 20)
+result = get_answer(random_number)
+print(result)
+
+# The 3 lines above can be rewritten to a single line:
+print(get_answer(random.randint(1, 20)))
+
+# And the check to see if the code is working as it should:
+print(f"(It is {random_number})")
+