accumulate.py

import itertools


"""Accumulate is a function that provides a running total of the values in an iterable. The last value is the sum total.
Prior to that sum total, each value represents the sum of all previous values. One obvious application would be to use
in a GUI cash register as demonstrated in the console version below."""
prices = []
first = input("Please enter the first price: ")
prices.append(float(first))

while True:
    num = input('Please enter the next price (enter "x" to stop): ')
    if str(num) == 'x'.lower():
        break
    else:
        num = float(num)
        prices.append(num)
        print(f"${num:,.2f}")
        run_tot = list(itertools.accumulate(prices))[-1]
        print(f"\tTotal: ${run_tot:,.2f}")
        c = len(prices)

print(f"\nThe Grand Total of {c} items is: ${run_tot:,.2f}.")
print(f"The sum of the first two items is: ${list(itertools.accumulate(prices))[1]:,.2f}.")