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Python infix to postfix conversion

Discussion in 'Programming' started by Ferris D Morris, Jul 12, 2022.

0
  1. #1
    In Python, I've begun to solve Data Structure difficulties. I'm converting from infix to postfix, however, I'm having trouble debugging a mistake in my software. The last return statement, when I do the join operation, contains NONE input.
    When I started debugging, I saw that something is incorrect in this section of code following the first push operation (for *). After that, whenever I call pop(), it returns NONE instead of *. Could someone please point out what is wrong here?
        *else:
        while (not s.isEmpty()) and (prec[s.peek()] >= prec[token]):
            #print token
            outlst.append(s.pop())
            #print outlst
        
        s.push(token)
        print (s.peek())*
    Code (markup):
    Source: Scaler
     
    Last edited: Oct 20, 2022
    Ferris D Morris, Jul 12, 2022 IP
  2. salvados guira

    salvados guira Peon

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    #2
    my son is very good for you problem, i speak him and he found your solution i send you
     
    salvados guira, Jul 19, 2022 IP