[Tutor] Simple RPN calculator

[Gregor Lingl]

Terry Carroll schrieb:

>On Mon, 6 Dec 2004, Chad Crabtree wrote:
>
>  
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>>Bob Gailer wrote:
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>>
>>>For grins I just wrote one that takes '1 2.3 - 3 4 5 + * /' as
>>>      
>>>
>>input 
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>>>and prints -0.0481481.... 8 lines of Python. That indeed is less
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>>than 
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>>>100. Took about 7 minutes to code and test. 
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>>>
>>I'm quite interested in seeing the sourcecode for that.
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>Me, too.  I'm always interested in cool little Python examples.
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Not having read the thread,  this script prints the same result:

inp = raw_input("Gimmi an RPN-expression: ").split()
i=0
while len(inp)>1:
    while inp[i] not in "+-*/":
        i+=1
    print "**", i, inp     #1 
    inp[i-2:i+1] = [str(eval(inp[i-2]+inp[i]+inp[i-1]))]
    i-=1
    print "***", i, inp    #2
print inp[0]

If you delete the two numbered print statements it also has 8 lines
of code. (They are inserted to show what's going on!)
Excuse me if this posting suffers from redundancy.
I'm very interested in Bob's solution, too
Gregor




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