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Commit d34d6b0d authored by ehcole's avatar ehcole
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edited rpn.py

parent e31fc16f
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...@@ -7,12 +7,12 @@ def calculate(arg): ...@@ -7,12 +7,12 @@ def calculate(arg):
try: try:
stack.append(int(token)) stack.append(int(token))
except ValueError: except ValueError:
val1 = stack.pop()
val2 = stack.pop() val2 = stack.pop()
val1 = stack.pop()
if token == '+': if token == '+':
result = val1 + val2 result = val1 + val2
elif token == '-': elif token == '-':
result = val2 - val1 result = val1 - val2
stack.append(result) stack.append(result)
return stack[0] return stack[0]
......
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