You want to track how many times a method use is called on different instances of class Tool. Which approach correctly counts calls across all instances?

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Python - Methods and Behavior Definition

You want to track how many times a method use is called on different instances of class Tool. Which approach correctly counts calls across all instances?

AUse a global variable outside the class

BUse a class variable incremented inside the method

CUse a local variable inside the method

DUse an instance variable incremented inside the method

Step-by-Step Solution

Solution:

Step 1: Understand counting across instances
To count method calls on all instances, a shared variable is needed.
Step 2: Identify shared variable type
A class variable is shared by all instances and can track total calls.
Final Answer:
Use a class variable incremented inside the method -> Option B
Quick Check:
Shared count needs class variable = D [OK]

Quick Trick: Class variables share data across instances [OK]

Common Mistakes:

Using instance variable counts separately
Using local variable resets count
Using global variable breaks encapsulation

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You want to track how many times a method use is called on different instances of class Tool. Which approach correctly counts calls across all instances?

Step 1: Understand counting across instances

Step 2: Identify shared variable type

Final Answer:

Quick Check:

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