Python is immutable objects: int, float, str, tuple, bool
Python variable objects: list, dict, set
Immutable objects:
a = 5 PK a = 4: 5 and the memory address in the address memory 4 is different
Variable Object:
list = [1, 2, 3, 4] PK list.append (5, 6): This is the list memory address is the same
* And placed dict tuple in the set or list of each of the objects are used as the key. Such as (1,2,3) may be, but (1, [2,3]) can not be variable [2,3]
* Add with update set collection (), by deleting remove ()
Delete list operation pop (), was added append (), extend (), delete remove () is to remove the element e
add operation dict dict [ ''] = '', remove pop