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First solution in Clear category for Digit Stack by Degusto
def digit_stack(commands):
result = 0
stack = []
for command in commands:
if command[:4] == "PUSH":
stack.append(int(command.split(' ', 1)[1]))
elif command[:4] == "PEEK" and stack != []:
result += stack[-1]
elif stack:
result += stack[-1]
stack = stack[:-1]
return result
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"
Nov. 18, 2015
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