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First solution in Clear category for Digit Stack by cdthurman
def digit_stack(commands):
stack, sum = [],0
for cmd in commands:
if 'PUSH' in cmd.upper():
stack.append(int(cmd.strip()[-1]))
elif 'POP' in cmd.upper() and len(stack):
sum += stack.pop()
elif len(stack):
sum+=stack[-1]
return sum
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 2, 2014
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