Two resistor voltage output

For zleap!

other/two_resistor_output.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+
+msg = """Voltage Divider Calculator (v1.1)
+Formula: Voltage out Voltage in * Resistor 2 / Resistor 1 + Resistor 2"
+
+You entered:
+    Voltage in {voltage}
+    Resistor 1 {resistor1}
+    Resistor 2 {resistor2}
+
+Which equals:
+    {output}
+
+Output voltage is: "{output}", rounded (nearest 10) is "{rounded}"!
+"""
+
+error = """Usage: python3 {script} <voltage in> <resistor 1> <resister 2>.
+Example: python3 {script} 5000 2000 4000
+
+Seeing an Error?
+ValueError: You enter an invalid value (or left it empty).
+"""
+
+
+def main(args):
+    script = args.pop(0)
+
+    try:
+        voltage, resistor1, resistor2 = list(map(int, args))
+        output = voltage * (resistor2 / (resistor1 + resistor2))
+    except ValueError:
+        print(error.format(script=script))
+        raise
+
+    print(msg.format(voltage=voltage, resistor1=resistor1,
+                     resistor2=resistor2, output=output,
+                     rounded=round(output)))
+
+
+if __name__ == '__main__':
+    import sys
+    sys.exit(main(sys.argv))