You want to keep track of how many objects of class Student are created using a class attribute count. Which code correctly updates count each time a new Student is made?

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Python - Classes and Object Lifecycle

You want to keep track of how many objects of class Student are created using a class attribute count. Which code correctly updates count each time a new Student is made?

Aclass Student: count = 0 def __init__(self): self.count += 1

Bclass Student: count = 0 def __init__(self): Student.count += 1

Cclass Student: def __init__(self): count = 0 count += 1

Dclass Student: count = 0 def __init__(self): count += 1

Step-by-Step Solution

Solution:

Step 1: Identify class attribute usage
count is a class attribute, so it should be accessed via the class name inside methods.
Step 2: Check each option for correct increment
class Student: count = 0 def __init__(self): Student.count += 1 uses Student.count += 1, correctly updating the class attribute. class Student: count = 0 def __init__(self): self.count += 1 tries to increment self.count, which creates an instance attribute instead. Options C and D have syntax or scope errors.
Final Answer:
class Student: count = 0 def __init__(self): Student.count += 1 -> Option B
Quick Check:
Update class attribute via ClassName.attribute [OK]

Quick Trick: Use ClassName.attribute to update class attributes inside methods [OK]

Common Mistakes:

Using self.attribute to update class attribute
Defining count inside __init__ instead of class
Forgetting to use class name to access class attribute

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You want to keep track of how many objects of class Student are created using a class attribute count. Which code correctly updates count each time a new Student is made?

Step 1: Identify class attribute usage

Step 2: Check each option for correct increment

Final Answer:

Quick Check:

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