Question: Write Python3 Code to evaluate a postfix expression from stack_array import Stack class PostfixFormatException(Exception): def postfix_eval(input_str): Evaluates a postfix expression Input argument: a string containing

Write Python3 Code to evaluate a postfix expression

from stack_array import Stack

class PostfixFormatException(Exception):

def postfix_eval(input_str): """Evaluates a postfix expression"""

"""Input argument: a string containing a postfix expression where tokens are space separated. Tokens are either operators + - * / ^ or numbers Returns the result of the expression evaluation. Raises an PostfixFormatException if the input is not well-formed."""

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