version 1.3

1. modes(selected)
2. print_(*args) *updated
3. input_(text=None)
4. process_key_simple(k) *added
5. integral()
6. solve_eq() *added
7. matrix_ops() *added by gemini
8. get_det(mat, n) *added by gemini
9. get_inverse(mat, n) *added by gemini
10. solve_system(A, B, n) *added by gemini
11. calc_slope() *added by gemini
12. graph_func() *added by gemini
13. show(text,Mode) #must be combined with print_() function
14. read_key()
15. process_key(k)
16. format_result(r) #must be combined with print_() function

added new functions to my calculator
fixed bugs:

• backspace in functions work didn't work
• backspace for math functions like math.sin() didn't delete the whole word
• better error handling

this release has so many bugs, i will try to solve them in the next release, also i need to combine some functions