Fix errors with the last code review

functions.ipynb

@@ -446,7 +446,10 @@
     "Write a Python function called `greet` that takes two parameters: `name` (a string) and `age` (an integer).\n",
     "The function should return a greeting message in the following format: `\"Hello, <name>! You are <age> years old.\"`\n",
     "\n",
-    "**Do not** forget to write a proper docstring and add the correct type hints to the parameters and the return value."
+    "<div class=\"alert alert-block alert-warning\">\n",
+    "    <h4><b>Note</b></h4>\n",
+    "    <strong>Do not</strong> forget to write a proper docstring and add the correct type hints to the parameters and the return value.\n",
+    "</div>"
    ]
   },
   {

tutorial/tests/test_functions.py

@@ -19,7 +19,7 @@ def read_data(name: str, data_dir: str = "data") -> pathlib.Path:
 
 def reference_greet(name: str, age: int) -> str:
     """Reference solution for the greet exercise"""
-    return f"Hello {name}, you are {age} years old."
+    return f"Hello {name}! You are {age} years old."
 
 
 def test_greet(function_to_test) -> None:
@@ -53,9 +53,9 @@ def reference_calculate_area(
     """Reference solution for the calculate_area exercise"""
     # Conversion factors from supported units to centimeters
     units = {
-        "cm": 1,
-        "m": 100,
-        "mm": 10,
+        "cm": 1.0,
+        "m": 100.0,
+        "mm": 10.0,
         "yd": 91.44,
         "ft": 30.48,
     }