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"""
gc 模块提供了垃圾收集器的控制接口。
def enable() -> None:
"""允许自动回收内存碎片。"""
...
def disable() -> None:
"""禁止自动回收，但可以通过collect()函数进行手动回收内存碎片。"""
def collect() -> None:
"""运行一次垃圾回收。"""
def mem_alloc() -> None:
"""返回已分配的内存数量。"""
def mem_free() -> None:
"""返回剩余的内存数量。"""