[Tutor] infix to postfix eval

[Anish Tambe]

On Sun, Aug 2, 2015 at 9:39 AM, Quiles, Stephanie
<stephanie.quiles001 at albright.edu> wrote:
>
> hello again!
>
> I have to unify these methods so that i can enter an infix, convert it to a postfix and then solve. Here are the methods

At the end of your code I added this -

inFixExpr = raw_input("Enter infix string : ")
postFixExpr = infixToPostfix(inFixExpr)
print("The postfix string is:  " + postFixExpr)
value = postfixEval(postFixExpr)
print("The final result is:  " + str(value))

And this gives me output -
$ python postfix.py
5 3 4 2 - ^ *
A B + C * D E - F G + * -
Enter infix string : ( 8 + 2 ) * ( 2 + 4 )
The postfix string is:  8 2 + 2 4 + *
The final result is:  60


>         if token in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" or token in "0123456789":

Instead of the above line, you can do this -
     if token in string.uppercase or token in string.digits:
Import string module first.

>>> import string
>>> string.uppercase
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> string.digits
'0123456789'
>>>

Thanks,
Anish