figure converting to postfix notationinfix expression the stack is popped twiceremoving both operators and placing as the last operator in the postfix expression in order to code the algorithm in pythonwe will use dictionary called prec to hold the precedence values for the operators this dictionary will map each operator to an integer that can be compared against the precedence levels of other operators (we have arbitrarily used the integers and the left parenthesis will receive the lowest value possible this way any operator that is compared against it will have higher precedence and will be placed on top of it line defines the operands to be any upper-case character or digit the complete conversion function is shown below import stack as previously defined def infix_to_postfix(infix_expr)prec {prec["*" prec["/" prec["+" prec["-" prec["(" op_stack stack(postfix_list [token_list infix_expr split( for token in token_listif token in "abcdefghijklmnopqrstuvwxyzor token in " "postfix_list append(tokenelif token ='('op_stack push(tokenelif token =')'top_token op_stack pop( basic data structures