A very simple yet functional calculator in ~20 lines.

consolecalc.py

# calc.py
# Simple calculator.

from os import system as s

nextNum = None
operations = []

def getNextNumber():
	nextNum = input(">> ")
	operations.append(float(nextNum))

while True:
	print "Console Calculator by Anthony Baynham"
	getNextNumber()
	for i in operations:
		print i
		s("pause")
		del operations[:]
		s("cls")