Python Beginners Day Collection, Hex

10day

Data type: Collection set

1, the definition of the collection

Collections: unordered, non-repeating combinations of data.

Feature: A, go to weight, put a list into a set, then automatically go heavy

b, the relationship test. Test the relationship between two sets of data, such as intersection, difference set, and set

2, the basic operation of the collection:

2.1 Create a collection:

s = {}

2.2 New

S.add () #若不重复则添加, if repeat is not added

S.update ([1,2,4]) #批量添加集合

S.copy () #复制一个集合

2.3 Delete

S.discard () #若有则删除元素, if no error

S.pop () #随机删除一个元素, if no error, return the deleted element

S.remove () #删除一个元素, if no error

S.clear () #清空

3, set of the relationship test

The relationship test of a set is divided into: intersection, difference set, set, symmetric difference set

3.1 Intersection: Two coincident parts of a set &

3.2 Difference set: In S1, not part of S2, there are two ways

The first type:-

S1-s2

Second type: S.difference ()

S1.difference (S2)

3.3 Set: There are S1 and S2 collections, there are two ways

First type: S.union ()

S1.union (S2)

The second type: | (Pipe character)

S1 | S2

3.4 Symmetric difference set: Only the set in S1 or S2 is present

S.symmetric_difference ()

4, the relationship between the set:

4.1 Subset: S.issubset () or S1>=S2

4.2 Superset: S.issperset () or S1<=S2

4.3 contains:

In,not in to determine whether an element is within a set

==,! = Determine if two sets are equal

4.4 Relationship:

There are generally three relationships between two sets: Intersect, disjoint, inclusive

The python species are judged by the following methods:

4.4.1 Disjoint: S.isdisjoint ()

Hexadecimal

1, 16 binary conversion

Binary: In the bin ()

Octal: 01234567 Oct ()

Hex: 0123456789ABCDEF Hex ()

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Python Beginners Day Collection, Hex