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Python Reference Manual: This book is only used as a reference book. When you encounter a problem, turn over the book and consolidate it (of course, the fact may be that you went directly to Google). This kind of book does not need to be brushed from beginning to end, but only needs to be checked and filled (e-books are fine)An old, but dignified and magnificent voice sounded.If an application uses a large number of objects, and a large number of these objects cause a large storage overhead, it should be considered. Also, most of the states of the object are external states. If you delete the external states of the object, you can replace many groups of objects with relatively few shared objects, or you can consider using the meta-sharing mode.一语提醒了板栗。城市是地球上发展速度最快的栖息地。尽管在我们看来，城市是缺乏大自然气息的水泥丛林，但对于各种大小的动物来说，城市是一个充满机会和惊喜的新栖息地。这些野生动物和人类有着相似的需求，它们也和人类一样面临着相似的挑战。不公？若是张富害得他们畅想了半天的裙钗梦，剁了他都不足以解恨。The "deliberate practice" introduced in this book is based on purposeful practice, but on top of this, there is more emphasis.