some changes

solutions/sum_range.py

@@ -1,10 +1,23 @@
 def sum_range(start, end):
-    """Calculates the sum of all integers from start to end, inclusive."""
+    """
+    Calculate the sum of all integers from start to end (inclusive).
+
+    Args:
+        start (int): The starting integer.
+        end (int): The ending integer.
+
+    Returns:
+        int: The sum of all integers from start to end.
+
+    Raises:
+        TypeError: If start or end is not an integer.
+    """
+    assert isinstance(start, int), "start must be an integer"
+    assert isinstance(end, int), "end must be an integer"
     # Ensure start is less than or equal to end
-    assert isinstance (start, int), "start must be an integer" 
-    assert isinstance (end, int), "end must be an integer"
     if start > end:
         start, end = end, start
+    # Calculate the sum of the range
     total = 0
     for number in range(start, end + 1):
         total += number

solutions/tests/test_sumrange.py → solutions/tests/test_sum_range.py

@@ -1,9 +1,11 @@
 import unittest
 from solutions.sum_range import sum_range
 
+""" Unit tests for the sum_range function. """
+
 
 class TestSumRange(unittest.TestCase):
-    """Unit tests for the Sum_range function."""
+    """Tests for the sum_range function."""
 
     def test_positive_range(self):
         """Test with a normal positive range."""