To calculate the number of local variables in a particular function we have a dedicated built-in function. Let us take a look at it

def addition_num(num1, num2): num1 += num2 return num1 def subtraction_num(num1, num2): num1 -= num2 return num1 def mul_num(num1, num2): num1 *= num2 return num1 def division_num(num1, num2): num1 /= num2 return num1 def default(num1, num2): return "Incorrect day" switcher = { 1: addition_num, 2: subtraction_num, 3: mul_num, 4: division_num, } def switch(operation, num1, num2): return switcher.get(operation, default)(num1, num2) print('''You can perform operation 1. Addition 2. Subtraction 3. Multiplication 4. Division 5. Module ''') # Take input from user choice = int(input("Select operation from 1,2,3,4 : ")) num1 = int(input("Enter first number: ")) num2 = int(input("Enter second number: ")) print ("Output:",switch(choice, num1, num2)) print("The number of local variables in addition_num function are :",addition_num.__code__.co_nlocals) print("The number of local variables in subtraction_num function are :",subtraction_num.__code__.co_nlocals) print("The number of local variables in mul_num function are :",mul_num.__code__.co_nlocals) print("The number of local variables in division_num function are :",division_num.__code__.co_nlocals) print("The number of local variables in default function are :",default.__code__.co_nlocals)

**Output:**

```
You can perform operation
1. Addition
2. Subtraction
3. Multiplication
4. Division
5. Module
Select operation from 1,2,3,4 : 1
Enter first number: 2
Enter second number: 3
Output: 5
The number of local variables in addition_num function are : 2
The number of local variables in subtraction_num function are : 2
The number of local variables in mul_num function are : 2
The number of local variables in division_num function are : 2
The number of local variables in default function are : 2
```

**Explanation:**

Here we simply used the **code.co_nlocals** to calculate the number of local variables in the particular function. All we have to do is add the name of the function at the beginning of the **code.co_nlocals**