In the code below, identify the correct instantiation of a new class object.

class Subtract:
def __init__(self, num1, num2):
self.num1= num1
self.num2 = num2
def calculate_diff(self):
diff = self.num1 - self.num2
print(diff)

Question

In the code below, identify the correct instantiation of a new class object.

class Subtract:
    def __init__(self, num1, num2):
        self.num1= num1
        self.num2 = num2
    def calculate_diff(self):
        diff = self.num1 - self.num2 
        print(diff)

BlackTom AI · Accepted Answer

A class in Python is instantiated by calling its name like a function with the arguments required by its __init__ method, so diff1 = Subtract(25, 10) is the correct form.

1) Relevant concepts
- Class definition and the __init__ method: __init__(self, num1, num2) declares that two positional arguments (num1 and num2) are required when creating a new instance.
- Instantiation syntax: To create an object, use ClassName(arg1, arg2, ...). This calls __init__ with those arguments and returns a new instance.
- Attribute assignment: Inside __init__, self.num1 and self.num2 store the passed values for later use by instance methods like calculate_diff().

2) Step-by-step reasoning
- The Subtract class requires two parameters besides self: num1 and num2.
- To instantiate, provide two values in order, e.g., 25 for num1 and 10 for num2.
- Using Subtract(25, 10) calls __init__(self, 25, 10), creating an object whose attributes are set: self.num1 = 25, self.num2 = 10.
- Assigning that object to a variable named diff1 stores the instance: diff1 = Subtract(25, 10).
- You can then call diff1.calculate_diff(), which computes diff = self.num1 - self.num2 (25 - 10) and prints 15.

3) Intermediate steps (attribute values)
- After instantiation: diff1.num1 = 25
- After instantiation: diff1.num2 = 10
- calculate_diff computation: diff = 25 - 10 = 15

4) Why this answer is correct
- It matches the required constructor signature and uses the correct Python instantiation pattern ClassName(args). The variable diff1 receives the new Subtract instance.

5) Why common incorrect alternatives are wrong
- Subtract.diff1(25, 10) is incorrect because that attempts to call a method on the class rather than create an instance.
- diff1 = Subtract(25) is incorrect because it supplies only one argument while two are required.
- diff1 = Subtract(num1=25, num2=10) would actually be valid, but is a different (keyword-argument) form; the provided correct choice uses positional args.

Conclusion: The correct instantiation is diff1 = Subtract(25, 10), which matches the provided answer.

In the code below, identify the correct instantiation of a new class object. class Subtract: def init(self, num1, num2): self.num1= num1 self.num2 = num2 def calculate_diff(self): diff = self.num1 - self.num2 print(diff) 单项选择题

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In the code below, identify the correct instantiation of a new class object. class Subtract: def __init__(self, num1, num2): self.num1= num1 self.num2 = num2 def calculate_diff(self): diff = self.num1 - self.num2 print(diff) 单项选择题