Solution

app/main.py

@@ -16,4 +16,7 @@
 }
 collection_of_coins = {1, 2, 25}
 
-# write your code here
+sorted_variables = {
+    "mutable": [my_favourite_films, marks, collection_of_coins],
+    "immutable": [lucky_number, pi, one_is_a_prime_number, name, profile_info],
+}

tests/test_main.py

@@ -68,8 +68,8 @@ def test_variables_values(variable, value):
 def test_variables_should_be_added_to_sorted_variables(variable_name):
     sorted_variables = getattr(app.main, "sorted_variables")
     assert (
-        getattr(app.main, variable_name) in sorted_variables["mutable"] or
-        getattr(app.main, variable_name) in sorted_variables["immutable"]
+        getattr(app.main, variable_name) in sorted_variables["mutable"]
+        or getattr(app.main, variable_name) in sorted_variables["immutable"]
     ), f"Variable '{variable_name}' should be added to 'sorted_variables'"
 
 
@@ -82,14 +82,12 @@ def is_immutable(obj):
 def test_variables_added_to_the_correct_list():
     sorted_variables = getattr(app.main, "sorted_variables")
     for variable in sorted_variables["mutable"]:
-        assert is_immutable(variable) is False, (
-            f"{variable} should be in 'immutable' list"
-        )
+        assert (
+            is_immutable(variable) is False
+        ), f"{variable} should be in 'immutable' list"
 
     for variable in sorted_variables["immutable"]:
-        assert is_immutable(variable) is True, (
-            f"{variable} should be in 'mutable' list"
-        )
+        assert is_immutable(variable) is True, f"{variable} should be in 'mutable' list"
 
 
 def test_removed_comment():