diff --git a/src/wireviz/wireviz.py b/src/wireviz/wireviz.py
index e1bd72f..18022ee 100755
--- a/src/wireviz/wireviz.py
+++ b/src/wireviz/wireviz.py
@@ -393,7 +393,7 @@ def parse(
         return tuple(returns) if len(returns) != 1 else returns[0]
 
 
-def _get_yaml_data_and_path(inp: Union[str, Path, Dict]) -> (Dict, Path):
+def _get_yaml_data_and_path(inp: Union[str, Path, Dict]) -> Tuple[Dict, Path]:
     # determine whether inp is a file path, a YAML string, or a Dict
     if not isinstance(inp, Dict):  # received a str or a Path
         if isinstance(inp, Path) or (isinstance(inp, str) and not "\n" in inp):
diff --git a/src/wireviz/wv_colors.py b/src/wireviz/wv_colors.py
index a813339..919ff0d 100644
--- a/src/wireviz/wv_colors.py
+++ b/src/wireviz/wv_colors.py
@@ -186,7 +186,7 @@ class MultiColor:
         elif len(self) == 3:
             out = [color.html for color in self.colors]
         else:
-            raise Exception(f"Padding not supported for len {len(selfq)}")
+            raise Exception(f"Padding not supported for len {len(self)}")
         return [str(color) for color in out]
 
     @property
diff --git a/src/wireviz/wv_dataclasses.py b/src/wireviz/wv_dataclasses.py
index ba529dd..d1711c3 100644
--- a/src/wireviz/wv_dataclasses.py
+++ b/src/wireviz/wv_dataclasses.py
@@ -82,8 +82,8 @@ class Options:
     template_separator: str = "."
     _pad: int = 0
     # TODO: resolve template and image paths during rendering, not during YAML parsing
-    _template_paths: [List] = field(default_factory=list)
-    _image_paths: [List] = field(default_factory=list)
+    _template_paths: List = field(default_factory=list)
+    _image_paths: List = field(default_factory=list)
 
     def __post_init__(self):
 
@@ -759,9 +759,9 @@ class Cable(TopLevelGraphicalComponent):
 
     def _connect(
         self,
-        from_pin_obj: [PinClass],
+        from_pin_obj: List[PinClass],
         via_wire_id: str,
-        to_pin_obj: [PinClass],
+        to_pin_obj: List[PinClass],
     ) -> None:
         via_wire_obj = self.wire_objects[via_wire_id]
         self._connections.append(Connection(from_pin_obj, via_wire_obj, to_pin_obj))
diff --git a/src/wireviz/wv_graphviz.py b/src/wireviz/wv_graphviz.py
index a1a2130..6e56a82 100644
--- a/src/wireviz/wv_graphviz.py
+++ b/src/wireviz/wv_graphviz.py
@@ -2,7 +2,7 @@
 
 import re
 from itertools import zip_longest
-from typing import Any, List, Optional, Union
+from typing import Any, List, Optional, Tuple, Union
 
 from wireviz import APP_NAME, APP_URL, __version__
 from wireviz.wv_bom import partnumbers2list
@@ -347,7 +347,7 @@ def gv_wire_cell(wire: Union[WireClass, ShieldClass], colspan: int) -> Td:
     return wire_outer_cell
 
 
-def gv_edge_wire(harness, cable, connection) -> (str, str, str):
+def gv_edge_wire(harness, cable, connection) -> Tuple[str, str, str, str, str]:
     if connection.via.color:
         # check if it's an actual wire and not a shield
         color = f"#000000:{connection.via.color.html_padded}:#000000"
@@ -391,7 +391,7 @@ def parse_arrow_str(inp: str) -> ArrowDirection:
         return ArrowDirection.NONE
 
 
-def gv_edge_mate(mate) -> (str, str, str, str):
+def gv_edge_mate(mate) -> Tuple[str, str, str, str]:
     if mate.arrow.weight == ArrowWeight.SINGLE:
         color = "#000000"
     elif mate.arrow.weight == ArrowWeight.DOUBLE:
@@ -448,7 +448,7 @@ def color_minitable(color: Optional[MultiColor]) -> Union[Table, str]:
     )
 
 
-def image_and_caption_cells(component: Component) -> (Td, Td):
+def image_and_caption_cells(component: Component) -> Tuple[Td, Td]:
     if not component.image:
         return (None, None)
 
diff --git a/src/wireviz/wv_harness.py b/src/wireviz/wv_harness.py
index 3fbff3d..249bfa9 100644
--- a/src/wireviz/wv_harness.py
+++ b/src/wireviz/wv_harness.py
@@ -3,7 +3,7 @@
 from collections import defaultdict
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import List
+from typing import List, Union
 
 from graphviz import Graph
 
@@ -35,7 +35,7 @@ from wireviz.wv_graphviz import (
     parse_arrow_str,
     set_dot_basics,
 )
-from wireviz.wv_output import embed_svg_images_file, generate_html_output
+from wireviz.wv_output import embed_svg_images, embed_svg_images_file, generate_html_output
 from wireviz.wv_utils import bom2tsv, open_file_write
 
 
@@ -210,11 +210,11 @@ class Harness:
     def connect(
         self,
         from_name: str,
-        from_pin: (int, str),
+        from_pin: Union[int, str],
         via_name: str,
-        via_wire: (int, str),
+        via_wire: Union[int, str],
         to_name: str,
-        to_pin: (int, str),
+        to_pin: Union[int, str],
     ) -> None:
         # check from and to connectors
         for (name, pin) in zip([from_name, to_name], [from_pin, to_pin]):
@@ -381,7 +381,7 @@ class Harness:
 
     def output(
         self,
-        filename: (str, Path),
+        filename: Union[str, Path],
         view: bool = False,
         cleanup: bool = True,
         fmt: tuple = ("html", "png", "svg", "tsv"),
diff --git a/src/wireviz/wv_utils.py b/src/wireviz/wv_utils.py
index 58209e1..10b5068 100644
--- a/src/wireviz/wv_utils.py
+++ b/src/wireviz/wv_utils.py
@@ -2,7 +2,7 @@
 
 import re
 from pathlib import Path
-from typing import List, Optional
+from typing import List, Optional, Union
 
 awg_equiv_table = {
     "0.09": "28",
@@ -159,7 +159,7 @@ def aspect_ratio(image_src):
     return 1  # Assume 1:1 when unable to read actual image size
 
 
-def smart_file_resolve(filename: str, possible_paths: (str, List[str])) -> Path:
+def smart_file_resolve(filename: str, possible_paths: Union[str, List[str]]) -> Path:
     if not isinstance(possible_paths, List):
         possible_paths = [possible_paths]
     filename = Path(filename)