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First solution in Clear category for Digit Stack by Plaix
def digit_stack(commands):
stack = []
summ = 0
for command in commands:
c = command.split(" ")
if c[0] == "PUSH":
stack.append(int(c[1]))
elif c[0] == "POP":
summ += stack.pop() if len(stack) > 0 else 0
elif c[0] == "PEEK":
summ += stack[len(stack)-1] if len(stack) > 0 else 0
return summ
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert digit_stack(["PUSH 3", "POP", "POP", "PUSH 4", "PEEK",
"PUSH 9", "PUSH 0", "PEEK", "POP", "PUSH 1", "PEEK"]) == 8, "Example"
assert digit_stack(["POP", "POP"]) == 0, "pop, pop, zero"
assert digit_stack(["PUSH 9", "PUSH 9", "POP"]) == 9, "Push the button"
assert digit_stack([]) == 0, "Nothing"
July 4, 2015