Polish notation python

#! /usr/bin/env python
from collections import deque
def parse(tokens):
    token=tokens.popleft()
    if token=='+':
            return parse(tokens)+parse(tokens)
    elif token=='-':
            return parse(tokens)-parse(tokens)
    elif token=='*':
            return parse(tokens)*parse(tokens)
    elif token=='/':
            return parse(tokens)/parse(tokens)
    else:
            # must be just a number
            return int(token)


if __name__=='__main__':
        expression="+ 2 2"
        print parse(deque(expression.split()))

Source: stackoverflow.com

Similar codes

0 vote180 views2 answers
Set operators
Python
1 vote181 views1 answer
An array of dates python
Python
0 vote224 views1 answer
Pandas: How to Drop Rows that Contain a Specific String
Python
0 vote177 views1 answer
Different types f python loops
Python
0 vote168 views1 answer
Python compare each item of one list
Python
6 votes181 views2 answers
Django read mesage
Python
0 vote166 views1 answer
How to show bar loading in python in cmd
Python
0 vote192 views1 answer
ValueError: Tried to convert 'shape' to a tensor and failed. Error: None values not supported.
Python
0 vote199 views1 answer
Python << meaning
Python
0 vote173 views1 answer
While attempts > 0:
Python