What is the collection in Python
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I. what is a set?
2. How to create a collection
Elements in the collection cannot be repeated
# location: Wuhan, Hubei # name: Pi Pi Zhi of Science and Engineering # Development time: 2022-2-27 19Rom 58pm 'first creation method' s = {1, 2, 4, 4, 4, 5, 4, 4, 5, 5, 7, print (s)''the second creation method Use set ()''s1=set (range (6)) print (S1) s2=set ([1y2) s3=set ((1) s4=set (' python') print (S4) s5=set ({7) 8pp99) print (s5) 'define an empty set' 's6=set () print (S6) III.
S = {10 in (10 in s) print (100 in s) print (10 not in s) print (100 not in s) 3.2 New operations of collection elements
Use add to add one, and update to add multiple
# location: Wuhan, Hubei # name: Pi Pi Zhi of the course of study and Engineering # Development time: 2022-2-28 22 print 42s = {10Magre 20je 30mins 50pyrus 50pyrus 70pime 90} s.add (100s) print (s) s.update ({200}) print (s) s.update ([111222333]) s.update ((44Magi 555066)) print (s) 3.3 deletion of collection elements
# location: Wuhan, Hubei # name: Pi Pi Zhi (Engineering) # Development time: 2022-2-28 22 s.discard 52s = {10 s.clear () print (s) 4, the relationship between sets
# location: Wuhan, Hubei # name: Pi Pi Zhi of the Science and Engineering Department # Development time: 2022-3-3 20 print 18 Pippi Zhi # Development time: 2022-3-3 20 print 20 print 30 40 40} s 2 = {30 print (20) print (s 1)''whether one set is a subset of another set''s = {10 line 20, 30 10, 50, 60, 80, 90} s 1 = {10, 10, 20, 30, 30, 40, 10, 10, 20, 30, 40, 10, 10, 20, 90, print (s1.issubset (s)) print (s2.issubset (S1)) 'one' Whether a set is a superset of another set''print (s.issuperset (S1)) print (s1.issuperset (S2))' 'whether there is no intersection between two sets' 'print (s1.isdisjoint (S2)) 5. Mathematical operation of set
# location: Wuhan, Hubei # name: Pi Pi Zhi of Science and Engineering # Development time: 2022-3-3 20 print 4pm intersection S1 = {10 s2print 20 30 40} S2 = {20 s1.union (S2)) # equivalent to S1 & S2 union print (s1.union (S2)) # equivalent to S1 | sonic difference set print (s1.difference (S2)) # equivalent to S1-s2print (s2.difference (S1)) # equivalent to S1-S1 symmetric difference set (s1.symmetric_difference (S2)) # is equivalent to S1 ^ s26, Set generation
# location: Wuhan, Hubei # name: Pippizhi of academic Engineering # Development time: 2022-3-3 21 print 21 for i in range (6)] print [I * for i in range (6)] print (lst)''set Generation''s = {ionomi for i in range (6)} print (s) Summary
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