Update page 'Day 3 Homework - Sloetjes'
xuanyi.wang
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**2. Modify the template to pass test 1, which checks that `int()` called on your class will return the value of `i`. **
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```
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class BoundedInt():
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def __init__(self, i, min, max):
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"""
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Create a bounded integer.
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Args:
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i (int): The initial value of the integer.
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min (int): The minimum value of the integer.
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max (int): The maximum value of the integer.
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"""
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self.i = i
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self.min = min
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self.max = max
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def __int__(self):
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return self.i
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```
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**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.**
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**6. Modify the template to pass test 2, which checks that:**
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* Your class implements the + operator.
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* * It throws ValueError when attempting to add another BoundedInt that would exceed self.max.
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```
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class BoundedInt:
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def __init__(self, i, min=None, max=None):
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self.i = i
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self.min = min
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self.max = max
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def __int__(self):
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return self.i
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def __add__(self, other):
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result = self.i + other
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if self.max is not None and result > self.max:
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raise ValueError("Value exceeds maximum bound.")
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return BoundedInt(result, self.min, self.max)
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def __sub__(self, other):
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result = self.i - other
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if self.min is not None and result < self.min:
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raise ValueError("Value exceeds minimum bound.")
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return BoundedInt(result, self.min, self.max)
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def __radd__(self, other):
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return self.__add__(other)
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def __repr__(self):
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return str(self.i)
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```
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**7. Do the same as 6, but for subtraction, to pass test 3.**
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```
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class BoundedInt:
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def __init__(self, i, min=None, max=None):
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self.i = i
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self.min = min
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self.max = max
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def __int__(self):
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return self.i
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def __sub__(self, other):
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result = self.i - other
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if self.min is not None and result < self.min:
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raise ValueError("Value exceeds minimum bound.")
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return BoundedInt(result, self.min, self.max)
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def __rsub__(self, other):
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return self.__sub__(other)
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def __repr__(self):
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return str(self.i)
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```
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**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.**
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```
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class BoundedInt():
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def __init__(self, i, min, max):
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self.i = i
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self.min = min
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self.max = max
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def __int__(self):
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return self.i
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def __add__(self, other):
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if isinstance(other, BoundedInt):
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result = self.i + other.i
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else:
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result = self.i + other
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if result > self.max:
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raise ValueError("Result exceeds max value")
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return BoundedInt(result, self.min, self.max)
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def __sub__(self, other):
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"""
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Subtracts another BoundedInt or an int from this BoundedInt.
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Raises:
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ValueError: If subtracting a BoundedInt would exceed self.min.
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"""
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if isinstance(other, BoundedInt):
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result = self.i - other.i
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else:
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result = self.i - other
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if result < self.min:
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raise ValueError("Result exceeds min value")
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return BoundedInt(result, self.min, self.max)
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```
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**9. Same as 8, but for subtraction.**
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```
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class BoundedInt():
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def __init__(self, i, min, max):
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self.i = i
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self.min = min
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self.max = max
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def __int__(self):
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return self.i
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def __sub__(self, other):
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if isinstance(other, BoundedInt):
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result = self.i - other.i
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else:
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result = self.i - other
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if result < self.min:
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raise ValueError("Result exceeds min value")
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return BoundedInt(result, self.min, self.max)
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```
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**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`.**
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```
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class BoundedInt():
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def __init__(self, i, min, max):
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self.i = i
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self.min = min
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self.max = max
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def __int__(self):
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return self.i
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def __add__(self, other):
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if isinstance(other, BoundedInt):
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result = self.i + other.i
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elif isinstance(other, str):
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score = sentiment(other)
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result = self.i + score
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else:
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result = self.i + other
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if result > self.max:
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raise ValueError("Result exceeds max value")
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return BoundedInt(result, self.min, self.max)
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def __sub__(self, other):
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if isinstance(other, BoundedInt):
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result = self.i - other.i
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elif isinstance(other, str):
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score = sentiment(other)
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result = self.i - score
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else:
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result = self.i - other
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if result < self.min:
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raise ValueError("Result exceeds min value")
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return BoundedInt(result, self.min, self.max)
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```
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#####An example of `sentiment(emoji)`:
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```
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def sentiment(emoji):
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sentiment_scores = {
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"😀": 8.9,
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"😢": -6.2,
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"😡": -9.5,
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"😍": 9.8,
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# and so on...
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}
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# look up the sentiment score for the given emoji, or return a neutral score if the emoji is not in the dictionary
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return sentiment_scores.get(emoji, 0.0)
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```
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