Image mode won't be attempted to be set

.vscode/settings.json

@@ -10,5 +10,7 @@
     },
     "[toml]": {
         "editor.defaultFormatter": "tamasfe.even-better-toml"
-    }
+    },
+    "python.analysis.typeCheckingMode": "basic",
+    "python.analysis.autoImportCompletions": true
 }

src/huepaper/generator.py

@@ -44,10 +44,10 @@ def generate(
             raise ValueError("Pixelation value must be set in form: 42x42")
 
     try:
-        random_color = False if color else True
+        random_color = not color
         base_color = get_base_color(color, sat_min, sat_max, lum_min, lum_max)
         if random_color:
-            print("Selected random base color: {}".format(base_color.hex))
+            print(f"Selected random base color: {base_color.hex}")
 
         c1, c2, c3, c4 = create_colors(
             base_color, hue_max, sat_min, sat_max, lum_min, lum_max
@@ -68,8 +68,6 @@ def generate(
         if emblem:
             image = add_emblem(image, emblem)
 
-        image.mode = "RGB"
-
         if _output:
             save_image(image, _output)
             return
@@ -77,5 +75,5 @@ def generate(
         return image
 
     except Exception as e:
-        print(str(e))
+        print(e)
         exit(1)

src/huepaper/utils.py

@@ -23,9 +23,9 @@ def get_base_color(
             base_color = Color(color_string)
         except:
             try:
-                base_color = Color("#{}".format(color_string))
+                base_color = Color(f"#{color_string}")
             except:
-                raise Exception("Invalid color expression: {}".format(color_string))
+                raise Exception(f"Invalid color expression: {color_string}")
 
     return base_color
 
@@ -43,7 +43,7 @@ def create_colors(
     max_lum_diff = 0.1
 
     # Create four random colors similar to the given base_color
-    for i in range(0, 4):
+    for _ in range(4):
         tmp_hue = base_color.hue + random.uniform(-hue_max / 2.0, hue_max / 2.0)
         if tmp_hue > 1.0:
             tmp_hue -= 1
@@ -60,7 +60,7 @@ def create_colors(
     return tuple(colors)
 
 
-def create_base_image(c1, c2, c3, c4, width=1920, height=1080):
+def create_base_image(c1, c2, c3, c4, width=1920, height=1080) -> Image:
     """Create a base huepaper by four corner colors.
 
     c1 - top left
@@ -79,9 +79,8 @@ def create_base_image(c1, c2, c3, c4, width=1920, height=1080):
     )
 
     im_arr = np.array([r, g, b]).T
-    image = Image.fromarray(np.uint8(im_arr * 255)).convert("RGBA")
     
-    return image
+    return Image.fromarray(np.uint8(im_arr * 255)).convert("RGBA")
 
 
 def add_lines(image, color):
@@ -103,7 +102,8 @@ def add_lines(image, color):
     )
     space = rand_width() // 2
     offset = random.randint(0, space)
-    for i in range(0, number_of_lines):
+    
+    for _ in range(number_of_lines):
         line_width = rand_width()
         x = offset + space + (line_width // 2)
         draw.line((x, 0, x, height), fill=color, width=line_width)
@@ -138,7 +138,7 @@ def add_emblem(image, filepath):
     try:
         emblem_image = Image.open(filepath)
     except Exception as e:
-        raise Exception("Failed to load emblem: {}".format(e))
+        raise Exception(f"Failed to load emblem: {e}")
 
     # Exit if emblem is too big
     if emblem_image.size[0] > width or emblem_image.size[1] > height:
@@ -161,11 +161,10 @@ def save_image(image, filepath):
     # Check whether file exists
     if os.path.isfile(filepath):
         overwrite = input(
-            "The file {} already exists. Do you want to overwrite it? [y/N] ".format(
+            f"The file {filepath} already exists. Do you want to overwrite it? [y/N] "
-                filepath
-            )
         )
-        if overwrite != "y" and overwrite != "Y":
+        
+        if overwrite not in ["y", "Y"]:
             save = False
 
     if save:
@@ -175,9 +174,10 @@ def save_image(image, filepath):
                 image.save(filepath)
                 stop = True
             except Exception as e:
-                print("Failed to save wallpaper: {}".format(e))
+                print(f"Failed to save wallpaper: {e}")
                 again = input("Do you want to try again? [Y/n] ")
-                if again == "n" or again == "N":
+
+                if again in ["n", "N"]:
                     stop = True
                 else:
                     filepath = input(