diff --git a/exercises/04-Call-a-function/solution.hide.py b/exercises/04-Call-a-function/solution.hide.py
new file mode 100644
index 0000000..d02eb4a
--- /dev/null
+++ b/exercises/04-Call-a-function/solution.hide.py
@@ -0,0 +1,7 @@
+def calculate_area(length,edge):
+	return length * edge
+
+# Your code Below this line:
+square_area1 = calculate_area(4,4)
+square_area2 = calculate_area(2,2)
+square_area3 = calculate_area(5,5)
\ No newline at end of file
diff --git a/exercises/04-Call-a-function/tests.py b/exercises/04-Call-a-function/tests.py
index cbd4870..52dc7d3 100755
--- a/exercises/04-Call-a-function/tests.py
+++ b/exercises/04-Call-a-function/tests.py
@@ -48,5 +48,5 @@ def test_call_calculate_area():
     path = os.path.dirname(os.path.abspath(__file__))+'/app.py'
     with open(path, 'r') as content_file:
         content = content_file.read()
-        regex = re.compile(r"=(\s*)calculate_area\(")
+        regex = re.compile(r"=(\s*)calculate_area\s*\(")
         assert bool(regex.search(content)) == True
\ No newline at end of file