diff --git a/01_hello/test.py b/01_hello/test.py
index d0cedd1c2..0e04a2bfe 100755
--- a/01_hello/test.py
+++ b/01_hello/test.py
@@ -4,7 +4,7 @@
 import os
 from subprocess import getstatusoutput, getoutput
 
-prg = './hello.py'
+prg = "./hello.py"
 
 
 # --------------------------------------------------
@@ -18,8 +18,8 @@ def test_exists():
 def test_runnable():
     """Runs using python3"""
 
-    out = getoutput(f'python3 {prg}')
-    assert out.strip() == 'Hello, World!'
+    out = getoutput(f"python3 {prg}")
+    assert out.strip() == "Hello, World!"
 
 
 # --------------------------------------------------
@@ -27,25 +27,25 @@ def test_executable():
     """Says 'Hello, World!' by default"""
 
     out = getoutput(prg)
-    assert out.strip() == 'Hello, World!'
+    assert out.strip() == "Hello, World!"
 
 
 # --------------------------------------------------
 def test_usage():
     """usage"""
 
-    for flag in ['-h', '--help']:
-        rv, out = getstatusoutput(f'{prg} {flag}')
+    for flag in ["-h", "--help"]:
+        rv, out = getstatusoutput(f"{prg} {flag}")
         assert rv == 0
-        assert out.lower().startswith('usage')
+        assert out.lower().startswith("usage")
 
 
 # --------------------------------------------------
 def test_input():
     """test for input"""
 
-    for val in ['Universe', 'Multiverse']:
-        for option in ['-n', '--name']:
-            rv, out = getstatusoutput(f'{prg} {option} {val}')
+    for val in ["Universe", "Multiverse"]:
+        for option in ["-n", "--name"]:
+            rv, out = getstatusoutput(f"{prg} {option} {val}")
             assert rv == 0
-            assert out.strip() == f'Hello, {val}!'
+            assert out.strip() == f"Hello, {val}!"