rpn calculator parser

Usage

>  python calculator.py

> (1 + sin1.5) ^ (cos(0) + ln2.7)
3.9714001717805405

> cat example.txt

sum = 0;

function sumTo( n ) {

for ( i =0; i<n; i = i 1 +){
sum = sum i +;
}

}

number1 = 97;
number2 = 120;
if( number1 > number2 ) {
sumTo(number1);
} else {
sumTo(number2);
}
print(sum);

>  python calc_rpn.py example.txt
7140