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python 集合型

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はじめに

下記を満たす要素の集まりを集合体と言う。
・重複する要素を持たない
・要素が順序を持たない

集合体は中括弧{}で生成。

a = {'a','a','b'}
print(a)#{'a', 'b'}
#重複する'a'が1つになっている。
演算
abcd = {'a','b','c','d'}
cdef = {'c','d','e','f'}
#和
print(abcd | cdef)#{'c', 'b', 'e', 'f', 'd', 'a'}
#積
print(abcd & cdef)#{'d', 'c'}
#差
print(abcd - cdef)#{'a', 'b'}
#対象差集合
print(abcd ^ cdef)#{'f', 'b', 'a', 'e'}
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