Update page 'Day 3 Homework - Karen'

Day 3 Homework - Karen.md

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+We're going to implement a class, `BoundedInt`, that only allows arithmetic within a given range of integers.  For simplicity, we're only going to support addition and subtraction for now.
+​
+Here's the standard class template, which we'll go over in more detail later on.  The test program is here:
+​
+https://gogs.gtsplab.com:5432/j/python-test/src/main/test13.py
+​
+You can either append it to the template below, or save the template as BoundedInt.py in the same directory and run test13.py to execute the tests.
+​
+```
+class BoundedInt():
+    def __init__(self, i, min, max):
+        """
+        Create a bounded integer.
+​
+        Args:
+            i (int): The initial value of the integer.
+            min (int): The minimum value of the integer.
+            max (int): The maximum value of the integer.
+        """
+        self.i = i
+        self.min = min
+        self.max = max
+```
+​
+1. Read this: https://docs.python.org/3/reference/datamodel.html?highlight=__int__#object.__int__
+2. Modify the template to pass test 1, which checks that `int()` called on your class will return the value of `i`.
+3. Read this, and the paragraph below it: https://docs.python.org/3/reference/datamodel.html?highlight=__int__#object.__add__
+4. What do you think the types of x and y are?  Guess, without checking first.  What are they, actually?  You can use the debugger's local window to find out.
+5. Don't forget that you can access the value of a BoundedInt by using either `.i` on it, or `int()`, now that you've passed test 1.
+6. Modify the template to pass test 2, which checks that:
+    * Your class implements the + operator.
+    * It throws ValueError when attempting to add another BoundedInt that would exceed `self.max`.
+7. Do the same as 6, but for subtraction, to pass test 3.
+8. Modify the template so it also supports adding a regular integer to a BoundedInt, to pass test 4.  Note that you can use `isinstance()` to determine the class of a variable.
+9. Same as 8, but for subtraction.
+10. You don't have to implement the code, but think about how you would change the template so it could allow adding a BoundedInt to an emoji, if there was a hypothetical function sentiment(emoji) which returned a floating point number from -10.0 to 10.0 which indicated whether the emoji was happy or sad.  e.g. BoundedInt(1, min = 1, max = 10) + 😁 would raise `ValueError`.
+​