This article mainly summarizes the relevant information about the syntax of set (set) in python3. The article gives detailed sample code, which has certain reference value for everyone. Friends who need it can take a look below.
Introduction
set Gu Mingsiyi is a set, and the elements of the set are unique and unordered. Putting some elements in a { } forms a set. The set can be of multiple data types (but not lists, sets, dictionaries, but can be tuples)
A set is an unordered non-repeating element of sets. Basic functionality includes relationship testing and elimination of duplicate elements. Set objects also support mathematical operations such as union, intersection, difference and sysmmetric difference.
The specific syntax is summarized as follows.
add (add elements)name = set(['Tom','Lucy','Ben']) name.add('Juny') print(name) #输出:{'Lucy', 'Juny', 'Ben', 'Tom'}
name = set(['Tom','Lucy','Ben']) name.clear() print(name) #输出:set()
name = set(['Tom','Lucy','Ben']) new_name = name.copy() print(new_name) #输出:{'Tom', 'Lucy', 'Ben'}
A = set([2,3,4,5]) B = set([3,4]) C = set([2]) n = n1.difference(n2,n3) print(n) #输出:{5} #返回A集合里面,在B和C集合中没有的元素,并生成新的集合
A = set([2,3,4,5]) B = set([4,5]) A.difference_update(B) print(A) #输出:{2, 3}
n = set([2,3,4]) n.discard(3) print(n) #输出:{2, 4}
n1 = set([2,3,4,5]) n2 = set([4,5,6,7]) n = n1.intersection(n2) print(n) #输出:{4, 5}
n1 = set([2,3,4,5]) n2 = set([4,5,6,7]) n1.intersection_update(n2) print(n1) #输出:{4, 5}
n1 = set([2,3,4,5]) n2 = set([4,5,6,7]) print(n1.isdisjoint(n2)) #输出:False
A = set([2,3]) B = set([2,3,4,5]) print(A.issubset(B)) #输出:True #A是B的子集
A = set([2,3]) B = set([2,3,4,5]) print(B.issuperset(A)) # 输出:True #B是A的父集
n = set([2,3,4,5]) n1 = n.pop() print(n,n1) # 输出:{3, 4, 5} 2
n = set([2,3,4,5]) n.remove(2) print(n) # 输出:{3, 4, 5}
A = set([2,3,4,5]) B = set([4,5,6,7]) print(A.symmetric_difference(B)) # 输出:{2, 3, 6, 7}
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}
A = set([2,3,4,5]) B = set([4,5,6,7]) print(A.union(B)) # 输出:{2, 3, 4, 5, 6, 7}
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}
Summary
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