Python Global variables can be used both inside and outside of functions. While a variable created inside a function can only be used inside the function that created it.

Variables created outside a function are global. They can be used outside functions, and within a function.

x = "Hello World" #global variable
print(x)

x = " World" #global variable

def myfunc():
    print("Hello " + x)

myfunc()

If you create a variable inside a function, this variable will be local, and can only be used inside the function. The global variable will still be used outside the function.

x = " World" #global variable

def myfunc():
    x = " Universe" #local variable
    print("Hello " + x)

myfunc() #will use the local variable to print Hello Universe

print(x) #will use the global variable to print Hello World

To create a global variable inside a function, the global keyword is used.

x = " World" #global variable

def myfunc():
    global x
    x = " Universe" #global variable

myfunc()

print("Hello " + x) #will print Hello Universe

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