Create colour_coding_resistor.py

electronics/colour_coding_resistor.py

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+from typing import List
+
+def decode_resistor_colors(colors: List[str]) -> float:
+    """
+    Calculate the resistance value of a resistor based on its color bands.
+
+    Args:
+        colors (List[str]): List of color codes in the order they appear on
+            the resistor.
+
+    Returns:
+        float: The resistance value in ohms.
+
+    Raises:
+        ValueError: If the input list does not have at least three color bands.
+
+    Color Codes:
+        - Black: 0
+        - Brown: 1
+        - Red: 2
+        - Orange: 3
+        - Yellow: 4
+        - Green: 5
+        - Blue: 6
+        - Violet: 7
+        - Gray: 8
+        - White: 9
+        - Gold: Multiply by 0.1
+        - Silver: Multiply by 0.01
+    """
+    if len(colors) < 3:
+        raise ValueError("A resistor must have at least three color bands.")
+
+    color_values = {
+        "black": 0, "brown": 1, "red": 2, "orange": 3, "yellow": 4,
+        "green": 5, "blue": 6, "violet": 7, "gray": 8, "white": 9,
+        "gold": 0.1, "silver": 0.01
+    }
+
+    first_band_value = color_values.get(colors[0].lower(), None)
+    second_band_value = color_values.get(colors[1].lower(), None)
+    multiplier_value = color_values.get(colors[2].lower(), None)
+
+    if None in (first_band_value, second_band_value, multiplier_value):
+        raise ValueError("Invalid color code. Check the spelling and colors.")
+
+    resistance = (first_band_value * 10 + second_band_value) * multiplier_value
+
+    return resistance
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()