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2023-06-07 19:56:05 -05:00
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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
def __int__(self):
"""
Convert the bounded integer to int.
Returns:
int: The value of the bounded integer.
"""
return self.i
def __add__(self, other):
if isinstance(other, BoundedInt):
if self.i + other.i > self.max:
raise ValueError("Addition exceeds maximum value")
return BoundedInt(self.i + other.i, self.min, self.max)
elif isinstance(other, int):
if self.i + other > self.max:
raise ValueError("Addition exceeds maximum value")
return BoundedInt(self.i + other, self.min, self.max)
else:
raise TypeError("Unsupported operand type")
def __sub__(self, other):
if isinstance(other, BoundedInt):
if self.i - other.i < self.min:
raise ValueError("Subtraction exceeds minimum value")
return BoundedInt(self.i - other.i, self.min, self.max)
elif isinstance(other, int):
if self.i - other < self.min:
raise ValueError("Subtraction exceeds minimum value")
return BoundedInt(self.i - other, self.min, self.max)
else:
raise TypeError("Unsupported operand type")
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from BoundedInt import BoundedInt
class BoundedIntTester:
def __init__(self):
pass
def test1(self):
bi1 = BoundedInt(0xdeadbeef, min = (0xdeadbeef-1), max = (0xdeadbeef+1))
if int(bi1) == 0xdeadbeef:
print(f"✅ Test 1 passed!")
else:
print(f"❌ Test 1 failed, int(bi1) = {int(bi1)}, expected 0xdeadbeef")
def test2(self):
"""
Test that addition works for two BoundedInts, and throws an error if the bounds are exceeded.
"""
bi2 = BoundedInt(1, min = 0, max = 1)
bi3 = BoundedInt(1, min = 0, max = 1)
try:
bi4 = bi2 + bi3 # 1 + 1 = 2, which is more than max = 1
print(f"❌ Test 2 failed!")
except ValueError as err:
print(f"✅ Test 2 passed!")
def test3(self):
"""
Test that addition works for two BoundedInts, and throws an error if the bounds are exceeded.
"""
bi4 = BoundedInt(1, min = 0, max = 1)
bi5 = BoundedInt(2, min = 0, max = -1)
try:
bi6 = bi4 - bi5 # 1 - 2 = (-1), which is less than min = 0
print(f"❌ Test 3 failed!")
except ValueError as err:
print(f"✅ Test 3 passed!")
def test4(self):
"""
Test that addition works for a BoundedInt and a regular int, and throws an error if the bounds are exceeded.
"""
bi7 = BoundedInt(1, min = 0, max = 1)
bi8 = 2
try:
bi9 = bi7 + bi8
print(f"❌ Test 4 failed!")
except ValueError as err:
print(f"✅ Test 4 passed!")
def test5(self):
"""
Test that subtraction works for a BoundedInt and a regular int, and throws an error if the bounds are exceeded.
"""
bi10 = BoundedInt(1, min = 0, max = 1)
bi11 = 2
try:
bi12 = bi10 - 11
print(f"❌ Test 5 failed!")
except ValueError as err:
print(f"✅ Test 5 passed!")
tester = BoundedIntTester()
tester.test1()
tester.test2()
tester.test3()
tester.test4()
tester.test5()
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########## This file only contains the question 2, 4, and 10. The rest is in the BoundedInt.py. ##########
# 2. Modify the template to pass test 1, which checks that int() called on your class will return the value of i.
# 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
# def __int__(self):
# """
# Convert the bounded integer to int.
# Returns:
# int: The value of the bounded integer.
# """
# return self.i
# 4. In that reading material, there's a sentence that starts with "For instance, to evaluate the expression x + y, "...
# 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.
# x might be an instance of a class that has defined the __add__() method
# And y is the object that is compatible with the x instance for the addition operation.
class MyClass:
def __init__(self, value):
self.value = value
def __add__(self, other):
if isinstance(other, MyClass):
return MyClass(self.value + other.value)
elif isinstance(other, int):
return MyClass(self.value + other)
else:
raise TypeError("Unsupported operand type.")
# Example usage
obj1 = MyClass(5)
obj2 = MyClass(10)
result1 = obj1 + obj2 # Calls obj1.__add__(obj2)
print(result1.value) # Output: 15
result2 = obj1 + 3 # Calls obj1.__add__(3)
print(result2.value) # Output: 8
# 10. 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.
# By adding the conceptional function 'sentiment(emoji)' in the '__add__()' method
# The sentiment will analyze the happy level of the input emoji and return a floating number from a number range
# For example:
# 10 for a 😊 smiley face
# -10 for a frowny face
# 0 for a 🍕
# The protential code can be like this:
'''
elif isinstance(other, str) and sentiment(other) < 0:
aise ValueError("Cannot add a BoundedInt to a sad emoji")
'''