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#!/usr/bin/env python3
# Challenge 039
#
# TASK #2
# Contributed by Andrezgz
# Write a script to demonstrate Reverse Polish notation(RPN). Checkout the wiki
# page for more information about RPN.
import sys
# simple rpn calculator
stack = []
def rpn(op):
if op.isdigit():
stack.append(int(op))
elif op == '+':
b = stack.pop()
a = stack.pop()
stack.append(a+b)
elif op == '-':
b = stack.pop()
a = stack.pop()
stack.append(a-b)
elif op == '*':
b = stack.pop()
a = stack.pop()
stack.append(a*b)
elif op == '/':
b = stack.pop()
a = stack.pop()
stack.append(a/b)
elif op == '.':
a = stack.pop()
print(a)
elif op.isspace():
pass
else:
print("invalid operation:", op)
for c in "".join(sys.argv[1:]):
rpn(c)
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