diff --git a/pytiled_parser/utilities.py b/pytiled_parser/utilities.py
index b3aae42..b43c367 100644
--- a/pytiled_parser/utilities.py
+++ b/pytiled_parser/utilities.py
@@ -1,5 +1,6 @@
-import functools
-from typing import Dict, List, Optional
+"""Helper unitilies for pytiled_parser."""
+
+from typing import List, Optional
 
 import pytiled_parser.objects as objects
 
@@ -13,8 +14,9 @@ def parse_color(color: str) -> objects.Color:
     Returns:
         :Color: Color object in the format that Arcade understands.
     """
-    # strip initial '#' character
-    if not len(color) % 2 == 0:
+    # the actual part we care about is always an even number
+    if len(color) % 2:
+        # strip initial '#' character
         color = color[1:]
 
     if len(color) == 6:
diff --git a/pytiled_parser/xml_parser.py b/pytiled_parser/xml_parser.py
index 9e504fb..63b0796 100644
--- a/pytiled_parser/xml_parser.py
+++ b/pytiled_parser/xml_parser.py
@@ -48,12 +48,12 @@ def _decode_base64_data(
     for byte in unzipped_data:
         int_value += byte << (byte_count * 8)
         byte_count += 1
-        if byte_count % 4 == 0:
+        if not byte_count % 4:
             byte_count = 0
             int_count += 1
             tile_grid[row_count].append(int_value)
             int_value = 0
-            if int_count % layer_width == 0:
+            if not int_count % layer_width:
                 row_count += 1
                 tile_grid.append([])
 
@@ -498,7 +498,7 @@ def _parse_tiles(
             terrain_list: List[Optional[int]] = []
             # each index in terrain_list_attrib refers to a corner
             for corner in terrain_list_attrib:
-                if corner == "":
+                if not corner:
                     terrain_list.append(None)
                 else:
                     terrain_list.append(int(corner))
diff --git a/tests/test_parser.py b/tests/test_parser.py
index 82c3388..360ddf3 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -1,6 +1,7 @@
+"""Unit tests for pytiled_parser"""
+
 import xml.etree.ElementTree as etree
 from contextlib import contextmanager
-from typing import Callable, List, Optional, Tuple
 
 import pytest
 from pytiled_parser import objects, utilities, xml_parser
@@ -12,24 +13,33 @@ def does_not_raise():
 
 
 def _get_root_element(xml: str) -> etree.Element:
+    """Get root element of string of XML.
+
+    Args:
+        xml (str): String of XML to be parsed into etree.
+
+    Returns:
+        etree.Element: Root element of XML given.
+    """
     return etree.fromstring(xml)
 
 
-layer_data = [
+LAYER_DATA = [
     (
-        '<layer id="1" name="Tile Layer 1" width="10" height="10">' "</layer>",
+        '<layer id="1" name="Tile Layer 1" width="10" height="10">'
+        + "</layer>",
         (int(1), "Tile Layer 1", None, None, None),
     ),
     (
         '<layer id="2" name="Tile Layer 2" width="10" height="10" opacity="0.5">'
-        "</layer>",
+        + "</layer>",
         (int(2), "Tile Layer 2", None, float(0.5), None),
     ),
     (
         '<layer id="5" name="Tile Layer 4" width="10" height="10" offsetx="49" offsety="-50">'
-        "<properties>"
-        "</properties>"
-        "</layer>",
+        + "<properties>"
+        + "</properties>"
+        + "</layer>",
         (
             int(5),
             "Tile Layer 4",
@@ -41,7 +51,7 @@ layer_data = [
 ]
 
 
-@pytest.mark.parametrize("xml,expected", layer_data)
+@pytest.mark.parametrize("xml,expected", LAYER_DATA)
 def test_parse_layer(xml, expected, monkeypatch):
     def mockreturn(*args):
         return "properties"
@@ -62,9 +72,6 @@ def test_parse_layer(xml, expected, monkeypatch):
     ],
 )
 def test_color_parsing(test_input, expected):
-    """
-    Tiled has a few different types of color representations.
-    """
     assert utilities.parse_color(test_input) == expected
 
 
@@ -94,7 +101,7 @@ def test_decode_csv_data(data_csv, expected):
     assert xml_parser._decode_csv_data(data_csv) == expected
 
 
-data_base64 = [
+DATA_BASE64 = [
     (
         "AQAAAAIAAAADAAAABAAAAAUAAAAGAAAABwAAAAgAAAAJAAAACgAAAAsAAAAMAAAADQAAAA4AAAAPAAAAEAAAABEAAAASAAAAEwAAABQAAAAVAAAAFgAAABcAAAAYAAAAGQAAABoAAAAbAAAAHAAAAB0AAAAeAAAAHwAAACAAAAAhAAAAIgAAACMAAAAkAAAAJQAAACYAAAAnAAAAKAAAACkAAAAqAAAAKwAAACwAAAAtAAAALgAAAC8AAAAwAAAA",
         8,
@@ -155,7 +162,7 @@ data_base64 = [
 
 
 @pytest.mark.parametrize(
-    "data_base64,width,compression,expected,raises", data_base64
+    "data_base64,width,compression,expected,raises", DATA_BASE64
 )
 def test_decode_base64_data(data_base64, width, compression, expected, raises):
     with raises: