Add actionable assertion messages to variables checks

checks/variables/variables1.py

@@ -1,7 +1,8 @@
+# checks/variables/variables1.py
 assert isinstance(a, int), "a should be an integer"
 assert isinstance(b, float), "b should be a float"
 assert isinstance(c, str), "c should be a string"
-assert a == 0
-assert b == 0.0
-assert c == ""
+assert a == 0, "a should be 0 — the default value from the exercise"
+assert b == 0.0, "b should be 0.0 — a float, not an int"
+assert c == "", "c should be an empty string"
 print("variables1 ✓")

checks/variables/variables2.py

@@ -1,3 +1,4 @@
+# checks/variables/variables2.py
 sum_ab = a + b
 diff_ab = a - b
 product_ab = a * b
@@ -12,8 +13,8 @@
 assert sum_ab == 13, "sum_ab should be 13"
 assert diff_ab == 7, "diff_ab should be 7"
 assert product_ab == 30, "product_ab should be 30"
-assert quotient_ab == 3.3333333333333335
-assert remainder_ab == 1
-assert sum_ac == "10hello"
-assert product_ac == "hellohellohello"
+assert quotient_ab == 3.3333333333333335, "quotient_ab should be about 3.3333"
+assert remainder_ab == 1, "remainder_ab should be 1"
+assert sum_ac == "10hello", "sum_ac should be '10hello'"
+assert product_ac == "hellohellohello", "product_ac should be 'hellohellohello'"
 print("variables2 ✓")