Question

I could really use the help.

Problem Develop a script to demonstrate an understanding of the overload (overwrite) methods of using Python operators. This lesson will focus on the “+” operator and the “__add__” method. The program must have the following: Demonstration of an understanding of how to use the + operator for basic addition of two integer numbers Demonstration of an understanding of how to use the + operator for a concatenation of lists Demonstration of an understanding of how to use the + operator for a concatenation of strings Demonstration of an understanding of how to overload the __add__ method Solving the Problem:

Step 1 Create a basic set of Python commands to demonstrate the addition of two integer numbers, and display the results in the operator interface window in PyCharm.

Step 2 Next, review the first example of an overloaded operator. In Python, the __add__ method that is being used to sum the two integer numbers above can also accept a list of numbers and concatenate them.

Step 3 Now, review the second example of an overloaded operator. In Python, the __add__ method that is being used to sum the two integer numbers above can also accept two strings and concatenate them.

Step 4 Lastly, overload the __add__ method, the method that has been used to sum two numbers, combine lists, and concatenate strings. Overload the method to format the output using the following code: return ‘%s plus %s’ % (self, x). Step 5 Run the scripts, and verify that the output matches the screenshot below. I'm really lost on how to finish this

Answer 1

For step 1 to 3(__add__ method has not been modified yet):

class Item:
    def __init__(self, x):
        self.x = x

    def __add__(self, otherItem):
        return self.x + otherItem.x

# Step 1
int1 = Item(5)
int2 = Item(6)
print(int1 + int2)

# Step 2
list1 = Item([1, 2, 3])
list2 = Item([4, 5, 6])
print(list1 + list2)

# Step 3
string1 = Item("Hello ")
string2 = Item("World")
print(string1 + string2)

OUTPUT:

Code after modified __add__ method:

class Item:
    def __init__(self, x):
        self.x = x

    # Step 4
    def __add__(self, otherItem):
        return '%s plus %s = ' % (self.x, otherItem.x) + str(self.x + otherItem.x)

# Step 1
int1 = Item(5)
int2 = Item(6)
print(int1 + int2)

# Step 2
list1 = Item([1, 2, 3])
list2 = Item([4, 5, 6])
print(list1 + list2)

# Step 3
string1 = Item("Hello ")
string2 = Item("World")
print(string1 + string2)

OUTPUT:

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