You want to create a class Counter that counts how many times its method increment is called on each object separately. Which code correctly implements this behavior?
hard📝 Application Q15 of 15
Python - Methods and Behavior Definition
You want to create a class Counter that counts how many times its method increment is called on each object separately. Which code correctly implements this behavior?
Instance variables (self.count) ensure each object tracks its own count separately. Methods must accept self and update self.count.
Step 2: Eliminate incorrect approaches
Class variables are shared across all instances. Missing self parameter in methods causes TypeError. Updating a local variable doesn't affect the instance attribute.
Final Answer:
class Counter:
def __init__(self):
self.count = 0
def increment(self):
self.count += 1
def get_count(self):
return self.count -> Option A
Quick Check:
Instance variables + self = separate counts [OK]
Quick Trick:Use self.variable for per-object data, not class variables [OK]
Common Mistakes:
Using class variables for per-object data
Forgetting self in method parameters
Incrementing local variables instead of instance attributes
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