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??????Python??????????????????????????????????????????

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?? {} ? set() ??????

• s1 = {10, 20, 30, 40, 50}

  • ?????{10, 20, 30, 40, 50}

• s2 = {10, 20, 30, 40, 10, 20}

  • ?????{10, 20, 30, 40}

• s3 = set('abdbsdf')

  • ?????{'a', 'b', 'd', 'f', 's', 's'}?????

• s4 = set()

  • ?????<class 'set'>

?????

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• add()???????

  s1 = {10, 20, 30, 40, 50}s1.add(100)

  • ???{10, 20, 30, 40, 50, 100}

• add()????None

  s1.add(10)

  • ???None

• update()???????

  s2 = [10, 20, 30, 40, 10, 20]s1.update(s2)

  • ???{10, 20, 30, 40}

????

• remove()??????????????

  s1.remove(10)

  • ???{20, 30, 40, 50}

• discard()???????????????

  s1.discard(10)

  • ???{20, 30, 40, 50}

• pop()??????????

  s1.pop()

  • ????40

????

• in???????

  10 in s1

  • ???True

• not in????????

  10 not in s1

  • ???True

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