函数内部的变量如何在python中的函数外部使用该变量

def get_variable():
    variable = "Hello"
    return variable

result = get_variable()
print(result)  # 输出：Hello

variable = "Hello"

def update_variable():
    global variable
    variable = "World"

update_variable()
print(variable)  # 输出：World

def update_variable(variable):
    variable = "World"
    return variable

variable = "Hello"
variable = update_variable(variable)
print(variable)  # 输出：World