Give an example to illustrate the function of python3 set method-Python Tutorial-php.cn

Give an example to illustrate the function of python3 set method

高洛峰

Release： 2017-03-21 14:25:11

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add(add elements)

name = set(['Tom','Lucy','Ben'])
name.add('Juny')print(name)#输出：{'Lucy', 'Juny', 'Ben', 'Tom'}

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clear(clear all elements)

name = set(['Tom','Lucy','Ben'])
name.clear()print(name)#输出：set()

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copy(copy set collection)

name = set(['Tom','Lucy','Ben'])
new_name = name.copy()print(new_name)#输出：{'Tom', 'Lucy', 'Ben'}

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difference(returns different elements in two or more sets and generates a new set)

A = set([2,3,4,5= set([3,4= set([2=

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difference_update(Delete elements in A set that exist in B set . )

A = set([2,3,4,5])
B = set([4,5])
A.difference_update(B)print(A)#输出：{2, 3}

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discard(remove elements)

n = set([2,3,4])
n.discard(3)print(n)#输出：{2, 4}

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intersection(take the intersection and generate a new set)

n1 = set([2,3,4,5])
n2 = set([4,5,6,7])
n = n1.intersection(n2)print(n)#输出：{4, 5}

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intersection_update(take the intersection and modify the original set)

n1 = set([2,3,4,5])
n2 = set([4,5,6,7])
n1.intersection_update(n2)print(n1)#输出：{4, 5}

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isdisjoint(Judge intersection, return False if yes, True if no)

n1 = set([2,3,4,5])
n2 = set([4,5,6,7])print(n1.isdisjoint(n2))#输出：False

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issubset(Judge subset)

A = set([2,3])
B = set([2,3,4,5])print(A.issubset(B))#输出：True#A是B的子集

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issuperset(Judge parent set)

A = set([2,3])
B = set([2,3,4,5])print(B.issuperset(A))# 输出：True#B是A的父集

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pop(randomly remove an element)

n = set([2,3,4,5])
n1 = n.pop()print(n,n1)# 输出：{3, 4, 5} 2

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remove(remove the specified element)

n = set([2,3,4,5])
n.remove(2)print(n)# 输出：{3, 4, 5}

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symmetric_difference(take the intersection and generate a new set)

A = set([2,3,4,5])
B = set([4,5,6,7])print(A.symmetric_difference(B))# 输出：{2, 3, 6, 7}

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symmetric_difference_update (take the intersection, change the original set)

A = set([2,3,4,5])
B = set([4,5,6,7])
A.symmetric_difference_update(B)print(A)# 输出：{2, 3, 6, 7}

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union (take the union, and generate a new set)

A = set([2,3,4,5])
B = set([4,5,6,7])print(A.union(B))# 输出：{2, 3, 4, 5, 6, 7}

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update (take the union, change the original set) Collection)

A = set([2,3,4,5])
B = set([4,5,6,7])
A.update(B)print(A)# 输出：{2, 3, 4, 5, 6, 7}

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