# Exhibit 4, define function in function. manage to change outer function variable
def send3(rec):
    greeting = "Hi"

    def message3(name):
        nonlocal greeting
        greeting = "Hello"
        return(f"{greeting}, {name}")

    innerFunc3 = message3(rec)
    print(f"Greeting is: {greeting}")
    return(innerFunc3)

res3 = send3("John")
print(type(res3))
print(res3)

# Outputs
#    Greeting is: Hello
#    <class 'str'>
#    Hello, John