Bob Gailer wrote:
> For grins I just wrote one that takes '1 2.3 - 3 4 5 + * /' as input > and prints -0.0481481.... 8 lines of Python. That indeed is less than > 100. Took about 7 minutes to code and test.
I'm quite interested in seeing the sourcecode for that.
I've made it interactive (enter an operand or operator and hit enter); it displays the top of the stack. I added . ^ and %. No error checking.
import operator as op
def rpn(o,stack = [],d = {'*':op.mul, '+':op.add, '/':op.truediv, '%':op.mod, '-':op.sub, '^':op.pow, '.':lambda x,y:x+.1*y}):
if o in d: stack[-2:] = [d[o](stack[-2], stack[-1])]
elif o: stack.append(float(o)) # could bomb here if input not floatable!
else: return 1
print stack[-1]
while 1:
if rpn(raw_input('>')): break
Let me know what you think.
Bob Gailer
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