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Find the error in this code snippet:

medium📝 Debug Q14 of 15
Python - Class Methods and Static Methods
Find the error in this code snippet:
class Cat:
    count = 0

    @classmethod
    def increment(cls):
        count += 1

Cat.increment()
AUsing count without cls prefix inside method
BMissing @staticmethod decorator
CMethod should have self parameter
DClass attribute count is not defined
Step-by-Step Solution
Solution:
  1. Step 1: Identify variable usage inside class method

    The method tries to increment count without cls., causing an error.
  2. Step 2: Correct usage of class attribute inside class method

    It should be cls.count += 1 to modify the class attribute.
  3. Final Answer:

    Using count without cls prefix inside method -> Option A
  4. Quick Check:

    Use cls.count to access class variable [OK]
Quick Trick: Always prefix class vars with cls inside class methods [OK]
Common Mistakes:
  • Forgetting cls. before class variable
  • Using self in class method
  • Missing decorator

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