40 lines
674 B
Python
40 lines
674 B
Python
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"""
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定义和使用集合
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Version: 0.1
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Author: 骆昊
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Date: 2018-03-06
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"""
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def main():
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set1 = {1, 2, 3, 3, 3, 2}
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print(set1)
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print('Length =', len(set1))
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set2 = set(range(1, 10))
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print(set2)
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set1.add(4)
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set1.add(5)
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set2.update([11, 12])
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print(set1)
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print(set2)
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set2.discard(5)
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# remove的元素如果不存在会引发KeyError
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if 4 in set2:
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set2.remove(4)
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print(set2)
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# 遍历集合容器
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for elem in set2:
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print(elem ** 2, end=' ')
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print()
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# 将元组转换成集合
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set3 = set((1, 2, 3, 3, 2, 1))
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print(set3.pop())
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print(set3)
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if __name__ == '__main__':
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main()
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