VALID_COLORS is defined as a set as well, to incerase performance

ColabTurtle/Turtle.py

@@ -21,6 +21,7 @@
 DEFAULT_PEN_WIDTH = 4
 # all 140 color names that modern browsers support. taken from https://www.w3schools.com/colors/colors_names.asp
 VALID_COLORS = ('black', 'navy', 'darkblue', 'mediumblue', 'blue', 'darkgreen', 'green', 'teal', 'darkcyan', 'deepskyblue', 'darkturquoise', 'mediumspringgreen', 'lime', 'springgreen', 'aqua', 'cyan', 'midnightblue', 'dodgerblue', 'lightseagreen', 'forestgreen', 'seagreen', 'darkslategray', 'darkslategrey', 'limegreen', 'mediumseagreen', 'turquoise', 'royalblue', 'steelblue', 'darkslateblue', 'mediumturquoise', 'indigo', 'darkolivegreen', 'cadetblue', 'cornflowerblue', 'rebeccapurple', 'mediumaquamarine', 'dimgray', 'dimgrey', 'slateblue', 'olivedrab', 'slategray', 'slategrey', 'lightslategray', 'lightslategrey', 'mediumslateblue', 'lawngreen', 'chartreuse', 'aquamarine', 'maroon', 'purple', 'olive', 'gray', 'grey', 'skyblue', 'lightskyblue', 'blueviolet', 'darkred', 'darkmagenta', 'saddlebrown', 'darkseagreen', 'lightgreen', 'mediumpurple', 'darkviolet', 'palegreen', 'darkorchid', 'yellowgreen', 'sienna', 'brown', 'darkgray', 'darkgrey', 'lightblue', 'greenyellow', 'paleturquoise', 'lightsteelblue', 'powderblue', 'firebrick', 'darkgoldenrod', 'mediumorchid', 'rosybrown', 'darkkhaki', 'silver', 'mediumvioletred', 'indianred', 'peru', 'chocolate', 'tan', 'lightgray', 'lightgrey', 'thistle', 'orchid', 'goldenrod', 'palevioletred', 'crimson', 'gainsboro', 'plum', 'burlywood', 'lightcyan', 'lavender', 'darksalmon', 'violet', 'palegoldenrod', 'lightcoral', 'khaki', 'aliceblue', 'honeydew', 'azure', 'sandybrown', 'wheat', 'beige', 'whitesmoke', 'mintcream', 'ghostwhite', 'salmon', 'antiquewhite', 'linen', 'lightgoldenrodyellow', 'oldlace', 'red', 'fuchsia', 'magenta', 'deeppink', 'orangered', 'tomato', 'hotpink', 'coral', 'darkorange', 'lightsalmon', 'orange', 'lightpink', 'pink', 'gold', 'peachpuff', 'navajowhite', 'moccasin', 'bisque', 'mistyrose', 'blanchedalmond', 'papayawhip', 'lavenderblush', 'seashell', 'cornsilk', 'lemonchiffon', 'floralwhite', 'snow', 'yellow', 'lightyellow', 'ivory', 'white')
+VALID_COLORS_SET = set(VALID_COLORS)
 SVG_TEMPLATE = """
       <svg width="{window_width}" height="{window_height}">
         <rect width="100%" height="100%" fill="{background_color}"/>
@@ -324,7 +325,7 @@ def isvisible():
     return is_turtle_visible
 
 def _validateColorString(color):
-    if color in VALID_COLORS: # 140 predefined html color names
+    if color in VALID_COLORS_SET: # 140 predefined html color names
         return True
     if re.search("^#(?:[0-9a-fA-F]{3}){1,2}$", color): # 3 or 6 digit hex color code
         return True