capcalc.py

#!/usr/bin/python2.7

class Capacitor:
	def __init__(self, name, price, post, volts, capacitance):
		self.n = name
		self.p = price
		self.post = post
		self.v = volts
		self.c = capacitance

caps = []

with open("capvals.txt", "r") as f:
	for line in f.readlines():
		p = line.split(",")
		caps.append(Capacitor(p[0], float(p[1]), float(p[2]), float(p[3]), float(p[4])))

vreq = float(raw_input("What voltage do you want? (V): "))
creq = float(raw_input("What capacitance do you need (nF): "))

for cap in caps:
	nseries = float(vreq/cap.v)
	nparallel = float((creq*nseries)/cap.c)

	total = nseries*nparallel

	totalprice = cap.p*total+cap.post

	print cap.n + ": You need " + str(total) + " (" + str(nseries) + " series, " + str(nparallel) + "parallel) costing GBP " + str(totalprice)