I do not know what happened

functions_to_test.py

@@ -1,34 +1,92 @@
 # Placeholder functions for Python basics, to be implemented later
 
 def add_numbers(a, b):
-    pass
+    return a + b
+
 
 def find_maximum(a, b, c):
-    pass
+    return max(a, b, c)
+
 
 def is_palindrome(string):
-    pass
+    if type(string) == type("stirng"):
+        if string == string[::-1]:
+            return True
+        else:
+            return False
+    else:
+        raise TypeError("Invalid input!")
+
 
 def count_word_occurrences(text, word):
-    pass
+    if type(text) == type(word):
+        text = text.upper()
+        word = word.upper()
+        count = text.count(word)
+        return count
+    else:
+        raise TypeError("Invalid type entered")
+
 
 def read_file_lines(filepath):
-    pass
+    if filepath:
+        with open(filepath, "r") as f:
+            file = f.readlines()
+            return file
+    else:
+        raise FileNotFoundError("File not found")
+
 
 def factorial(n):
-    pass
+    fact = n
+
+    if type(n) != type(0):
+        raise TypeError("Invalid type!")
+    elif n == 0:
+        return 1
+    elif n < 0:
+        raise ValueError("Invalid number!")
+    for i in range(1, n):
+        fact = fact * i
+    return fact
+
 
 def is_prime(n):
-    pass
+    count = 0
+    if type(n) == type(0):
+        if n == 1:
+            return False
+        elif n < 0:
+            raise ValueError("Prime not defined for negative numbers")
+        for i in range(1, n + 1):
+            if n % i == 0:
+                count += 1
+        if count > 2:
+            return False
+        else:
+            return True
+    elif type(n) != type(0):
+        raise TypeError("Invalid input!")
+
 
 def sort_numbers(numbers):
-    pass
+    if numbers == []:
+        return []
+    for i in numbers:
+        if type(i) == type(0):
+            return sorted(numbers)
+        else:
+            raise TypeError("Invalid list elements")
 
-def factorial(n):
-    pass
 
 def fibonacci(n):
-    pass
+    fibo_list = [0, 1]
+
+    for i in range(n - 1):
+        fibo_list.append(fibo_list[len(fibo_list) - 2] + fibo_list[len(fibo_list) -1])
+
+    return fibo_list[n]
+
 
 def tower_of_hanoi(n, source, auxiliary, target):
 
@@ -48,14 +106,22 @@ def tower_of_hanoi(n, source, auxiliary, target):
     >>> tower_of_hanoi(3, 'A', 'B', 'C')
     [('A', 'C'), ('A', 'B'), ('C', 'B'), ('A', 'C'), ('B', 'A'), ('B', 'C'), ('A', 'C')]
     """
+
     pass
 
 class Person:
     def __init__(self, name, age):
-        pass
+        self.name = name
+        self.age = age
+
+        if type(name) != type("string"):
+            raise TypeError
+        if type(age) != type(0):
+            raise TypeError
 
 
 if __name__ == "__main__":
     # Placeholder functions for Python basics, to be implemented later
     #to test your functions, you can use the following code
-    print(add_numbers(3, 5)) #e.g
+    # print(add_numbers(3, 5)) #e.g
+    print(read_file_lines("nkulu.txt"))