resistor calculator

calculator/calculator.py

+def main():
+    resistors = [30,
+                 33,
+                 36,
+                 39,
+                 43,
+                 47,
+                 49.9,
+                 51,
+                 56,
+                 62,
+                 68,
+                 75,
+                 82,
+                 91,
+                 100,
+                 110,
+                 120,
+                 130,
+                 150,
+                 180,
+                 200,
+                 220,
+                 240,
+                 270,
+                 300,
+                 330,
+                 360,
+                 390,
+                 430,
+                 470,
+                 499,
+                 510,
+                 560,
+                 620,
+                 680,
+                 750,
+                 820,
+                 910,
+                 1000,
+                 1200,
+                 1500,
+                 2000,
+                 2200,
+                 2700,
+                 3300,
+                 4700,
+                 4990,
+                 5600,
+                 10000]
+
+    target_ratio = 4.5
+
+    ratio_dict = {}
+
+    n = len(resistors)
+
+    for i in range(n):
+        for j in range(n):
+            if j < i:
+                continue
+            ratio_dict[(i, j)] = resistors[j] / resistors[i]
+
+    ij_sorted = sorted(ratio_dict.keys(), key=lambda x: abs(ratio_dict[x] - target_ratio))
+
+    i, j = ij_sorted[0]
+    print(f"Values: {resistors[i]}, {resistors[j]}")
+    print(f"Ratio: {ratio_dict[i, j]}")
+    print(f"Error: {100 * abs(ratio_dict[i, j] / target_ratio - 1):.2f} %")
+
+
+if __name__ == "__main__":
+    main()