Python local example

Python local example

Here is a Python example that demonstrates a simple calculator program:

def add(x, y):
return x + y
def subtract(x, y):
return x - y
def multiply(x, y):
return x * y
def divide(x, y):
if y == 0:
return "Error: Division by zero is not allowed"
else:
return x / y
print("Select operation:")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
while True:
choice = input("Enter your choice (1/2/3/4): ")
if choice in ('1', '2', '3', '4'):
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
if choice == '1':
print(num1, "+", num2, "=", add(num1, num2))
elif choice == '2':
print(num1, "-", num2, "=", subtract(num1, num2))
elif choice == '3':
print(num1, "*", num2, "=", multiply(num1, num2))
elif choice == '4':
print(num1, "/", num2, "=", divide(num1, num2))
else:
print("Invalid input")

This program is a simple calculator that allows users to perform basic arithmetic operations such as addition, subtraction, multiplication, and division. It repeatedly prompts the user for input until they choose to quit.

In this code:

This code can be run in any Python environment.

Python local keyword

I'd be happy to explain the local keyword in Python!

In Python, the local keyword is used to declare a variable as local to a specific block of code. This means that the variable will not be visible outside of that block.

Here's an example of how you can use the local keyword:

def my_function():
global x  # declare x as global
x = 10
def inner_function():
local y = 20  # declare y as local to inner_function
print(y)  # prints 20
print(x)  # prints 10 (because x is declared as global)
inner_function()
print(y)  # raises NameError because y is not visible outside of inner_function
my_function()
print(x)  # prints 10

In this example, x is declared as global within the my_function, so it's accessible from both my_function and its inner function. On the other hand, y is declared as local to the inner_function, so it's not visible outside of that function.

When you call my_function(), you can see that y is only printed within the inner_function, and raises a NameError when trying to access it from the outer scope. This is because the local keyword effectively hides any variables with the same name in higher scopes.

Using the local keyword helps keep your code organized by preventing accidental variable name collisions. It's particularly useful when writing recursive functions, as you can use local variables to store temporary results without worrying about affecting global state.

Here are some key takeaways:

I hope this explanation was helpful!