此方法容易受到用于禁用项的常规警告的影响：避免由于偶然地禁用重要项而使程序处于不可用状态。
This approach is subject to the general caveat that applies to disabling items: Avoid leaving your program in an unusable state accidentally by disabling crucial items.
释放全局解释器锁。锁必须提前创建。这个函数在编译时禁用线程支持的情况下不可用。
Release the global interpreter lock. The lock must have been created earlier. This function is not available when thread support is disabled at compile time.
这个函数在编译时禁用线程支持的情况下不可用。
This function is not available when thread support is disabled at compile time.
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