Python program to check matching of simple parentheses

Question

I am a Python newbie and I came across this exercise of checking whether or not the simple brackets \"(\", \")\" in a given string are matched evenly.

I have seen ex

Answer 1

input_str = "{[()](){}}"
strblance=""

for i in input_str:

    if not strblance:
        strblance = strblance+i
    elif (i is '}' and strblance[len(strblance)-1] is '{') \
        or ( i is']'and strblance[len(strblance)-1] is '[') \
        or ( i is ')'and strblance[len(strblance)-1] is '('):
            strblance = strblance[:len(strblance)-1]
    else:
        strblance = strblance+i

if not strblance:

    print ("balanced")

else:

    print ("Not balanced")