diff --git a/src/python/tests/test_basic.py b/src/python/tests/test_basic.py
index 97ed7eb..9cc6813 100644
--- a/src/python/tests/test_basic.py
+++ b/src/python/tests/test_basic.py
@@ -164,8 +164,9 @@ def test_get_hash_array():
     ), "Hash array counts should match the counts of 'AAA' and 'AAC' and return zero for 'GGG'."
     assert rev_counts == [0, 1, 2], "Count should be in same order as input list"
 
+
 def test_get_array():
     """
     Get vector of counts corresponding to vector of kmers.
     """
-    pass
\ No newline at end of file
+    pass
diff --git a/src/python/tests/test_kmer_map.py b/src/python/tests/test_kmer_map.py
index f4bf376..e894d18 100644
--- a/src/python/tests/test_kmer_map.py
+++ b/src/python/tests/test_kmer_map.py
@@ -4,5 +4,5 @@
 
 
 def test_kmermap():
-    '''Test option to add kmermap'''
-    pass
\ No newline at end of file
+    """Test option to add kmermap"""
+    pass
diff --git a/src/python/tests/test_output.py b/src/python/tests/test_output.py
index 8394602..382b8a3 100644
--- a/src/python/tests/test_output.py
+++ b/src/python/tests/test_output.py
@@ -4,21 +4,25 @@
 
 
 def test_serialise():
-    '''Serialise object to JSON '''
+    """Serialise object to JSON"""
     pass
 
+
 def test_deserialise():
-    '''Load object from file.'''
+    """Load object from file."""
     pass
 
+
 def test_dump():
-    '''Write tab delimited kmer:count pairs'''
+    """Write tab delimited kmer:count pairs"""
     pass
 
+
 def test_dump_hash():
-    '''Write tab delimited hash_count pairs '''
+    """Write tab delimited hash_count pairs"""
     pass
 
+
 def test_histo():
-    '''Write frequency counts.'''
+    """Write frequency counts."""
     pass
diff --git a/src/python/tests/test_setops.py b/src/python/tests/test_setops.py
index df71ee3..a332faf 100644
--- a/src/python/tests/test_setops.py
+++ b/src/python/tests/test_setops.py
@@ -3,6 +3,7 @@
 
 from test_basic import create_sample_kmer_table
 
+
 # Set operations
 def test_union():
     table1 = create_sample_kmer_table(3, ["AAA", "AAC"])