python----four built-in data structures (dict, list, tuple, set)

1, dict

Unordered, can be changed

2. tuple

Ordered, unchangeable

3, list

Orderly, can be changed (add, delete)

4, set

Disordered, may change

{element 1, element 2, element 3.....} are defined with curly brackets like the dictionary, but the difference is that there is no colon separation, there is another definitionThe method is to pass any sequence to the set() function (such as a string set('fsdaf'))

Operation of 2 sets:

The set in python is the same as the set in mathematics. It also has intersection, union, difference and other operations. The union provides the method union(), the difference method difference(), but the difference here is different.It is only possible to display all elements in the collection using this method that are different from another collection, and the method intersection() of the intersection displays the same elements

The following code is used to implement the above method:

#Set operation
temp={'a','e','i','o','u'}
temp2=set("fda");

#Intersection operation
result=temp.intersection(temp2)#{'a'}

#Parallel operation
result=temp.union(temp2)#{'a', 'o', 'f', 'd', 'u', 'e', ​​'i'}

#Difference operation
result=temp.difference(temp2)#{'o', 'e', ​​'u', 'i'}
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1. Author:​ ​Syw​​

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