這個我日常當中也沒有用到過，

真的是游戲行業用得多些？

學習一下，

有個印象。

import random from enum import EnumTreeType = Enum('TreeTye', 'apple_tree cherry_tree peach_tree')class Tree:pool = dict()def __new__(cls, tree_type):obj = cls.pool.get(tree_type, None)if not obj:obj = object.__new__(cls)cls.pool[tree_type] = objobj.tree_type = tree_typereturn objdef render(self, age, x, y):print('render a tree of type {} and age {} at ({}, {})'.format(self.tree_type, age, x, y))def main():rnd = random.Random()age_min, age_max = 1, 30min_point, max_point = 0, 100tree_counter = 0for _ in range(10):t1 = Tree(TreeType.apple_tree)t1.render(rnd.randint(age_min, age_max),rnd.randint(min_point, max_point),rnd.randint(min_point, max_point))tree_counter += 1for _ in range(3):t2 = Tree(TreeType.cherry_tree)t2.render(rnd.randint(age_min, age_max),rnd.randint(min_point, max_point),rnd.randint(min_point, max_point))tree_counter += 1for _ in range(5):t3 = Tree(TreeType.peach_tree)t3.render(rnd.randint(age_min, age_max),rnd.randint(min_point, max_point),rnd.randint(min_point, max_point))tree_counter += 1if __name__ == '__main__':main()

轉載于:https://www.cnblogs.com/aguncn/p/9419943.html

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