utils + parallel resistors calculator

parallel_resistors.py

@@ -0,0 +1,18 @@
+#!/bin/python
+from utils import parse_resistors
+
+def get_input():
+    raw_input_resistors = input("Enter resistor values separated by spaces or commas: ")
+    resistors = parse_resistors(raw_input_resistors)
+    return resistors
+
+def calculate_resistance(resistors):
+    return 1 / sum(1 / r for r in resistors)
+
+if __name__ == '__main__':
+    try:
+        resistors = get_input()
+    except ValueError as e:
+        print(e)
+        exit(1)
+    print(f"Total resistance = {calculate_resistance(resistors)} ohms")