如何访问另一个函数中一个函数中定义和声明的变量？

variable = 0

def function1():
    global variable
    variable = 1

def function2():
    global variable
    print(variable)

function1()
function2()

def function1():
    variable = 1
    return variable

def function2():
    variable = function1()
    print(variable)

function2()