What is block scope in Python?

What is block scope in Python?

In Python, block scope refers to the visibility of variables defined within a block of code, such as within a function or a loop.

Can you give me an example of block scope?

Sure! In Python, if you define a variable inside a function, it cannot be accessed outside that function. For example:

def my_function():
    x = 10  # x is in the local scope of my_function
    print(x)

my_function()  # This will print 10
print(x)  # This will raise a NameError

What about global variables?

Global variables are defined outside of any function and can be accessed from anywhere in the code. However, if you want to modify a global variable inside a function, you need to use the global keyword.

Are there any exceptions to block scope?

In Python, the main exception is that nested functions can access variables from their enclosing functions, which is a feature of closures.