如何将ctx作用域传递给外部函数？

def outer_function(callback):
    ctx = "example context"
    callback(ctx)

def inner_function(ctx):
    print(ctx)

outer_function(inner_function)

ctx = None

def outer_function():
    global ctx
    ctx = "example context"

def print_ctx():
    print(ctx)

outer_function()
print_ctx()

class OuterClass:
    def __init__(self):
        self.ctx = None

    def outer_function(self):
        self.ctx = "example context"

    def print_ctx(self):
        print(self.ctx)

outer_instance = OuterClass()
outer_instance.outer_function()
outer_instance.print_ctx()