Can you explain the concept of global scope in programming?

Global scope in programming is the area where variables or objects are accessible from anywhere in the program. In Python, global variables are declared at the module level and are visible in all functions and classes of that module unless explicitly overridden locally.

For example:

x = 10  # global variable

def func():
    print(x)  # access to global variable

func()  # will output 10

If you need to modify a global variable inside a function, you must use the global keyword:

x = 10

def func():
    global x
    x = 20

func()
print(x)  # will output 20

The global scope is convenient for storing settings or constants, but excessive use of global variables can lead to difficulties in maintaining and testing the code.