Elements in the list are separated by commas

Pack multiple data and store them into one data type. Identified with [], it supports numbers and strings, and can contain lists (that is, nested). Different types of data items can also appear in the same list. Lists are the most common composite data type in Python.

At the time of definition, the elements in the tuple are determined, and elements cannot be appended, inserted, or modified later. Using tuples can make the code safer

An ordered set is similar to a list, except that the elements of a tuple cannot be modified and are marked with ()

Dictionary keys and values ​​are separated by colons

Identified with {} and using key-value (key-value) storage, it is equivalent to saving two sets of data. One set of data is key data and is called key; the other set of data can be accessed through key and is called value. . There is a one-to-one correspondence between key and value

When creating a collection, if duplicate elements are passed in, they will be automatically filtered.

Similar to a dictionary, it is a collection of keys, but does not store values. Since keys cannot be repeated, there are no duplicate keys in the collection. The collection can be regarded as a collection of unordered and non-repeating elements in the mathematical sense. The collection uses { }identification