Are python collections mutable types?

Python variables can be divided into two types

Immutable types (numbers, strings, tuples, immutable collections)

Variable types (lists, dictionaries, Variable collection)

#The variables declared by python exist in the form of objects and exist in the fixed memory of the machine.

can be understood as a pointer to an object with the variable name

Collection

We often use it to perform deduplication and relational operations, Collections are unordered.

s = {1,'d','34','1',1}
print(s,type(s),id(s))
s.add('djx')
print(s,type(s),id(s))
result:
{'d', 1, '34', '1'}  870405285032
{1, '34', 'djx', '1', 'd'}  870405285032

We can find that although the collection data changes, the memory address does not change, so the collection is a variable data type.

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