如何在另一个函数中定义的函数中使用变量？

def outer_function():
    variable = 10
    
    def inner_function(var):
        print(var)
    
    inner_function(variable)

outer_function()

def outer_function():
    variable = 10
    
    def inner_function():
        print(variable)
    
    return inner_function

inner = outer_function()
inner()

def outer_function():
    global variable
    variable = 10
    
    def inner_function():
        print(variable)
    
    inner_function()

outer_function()