calpy

Calculator in Python using tkinter for GUI.

Emulates an old-school handheld calculator, or the standard Microsoft calculator app.

Files

• calc.py is our GUI
• calc_func.py contains our calculation functions
• test_calc_func.py contains unit tests for calc_func.py

Calculation Functions

calculate(expr_list) accepts a list of strings containing numbers and operators. Returns the result of calculating the expression as an int or float.

expr_list examples

Consider the following key presses (from left to right):

Display

Key Presses                                          calculate()
===========                                          ===========

7  +  3  /  2  x  3  =
^  ^  ^  ^  ^  ^  ^  ^
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  Entry "15", Label "5 x 3 ="
|  |  |  |  |  |  Entry "3", Label "5 x"             calculate(['5', 'x', '3']) => 15
|  |  |  |  |  Entry "5", Label "5 x"
|  |  |  |  Entry "2", Label "10 /"                  calculate(['10', '/', '2']) => 5
|  |  |  Entry "10", Label "10 /"
|  |  Entry "3", Label "7 +"                         calculate(['7', '+', '3']) => 10
|  Entry "7", Label "7 +"
Entry "7", Label ""

Calculation Steps

   7
+  3
----
  10
/  2
----
   5
x  3
====
  15