A stack based calculator built with python
+ - adds the first element on the stack and whats in the entry box
- - subtracts the first element with the entry
* - multiply the first element with the entry
/ - divide the first element with the entry
^ - power first ** entry
! - factorial on the entry
c - clear stack
d - dup last element
r - roll the stack
p - set entry to the value of pi
x - pop first element on stack
e - set entry to the natural number
j - join all elements into an vector