This tutorial help to understand python collection types. There are four collection data types in python. It’s a very common and useful data type for python programming language.
There are some in-built collection types like list, dict, set and tuple etc. Python has a number of modules which are providing additional data structures to store collected data. The most popular is the collection module.
- List: This is an ordered and changeable collection of data types. It Allows duplicate members.
- Tuple: This is a collection that is ordered and unchangeable. It Allows duplicate members.
- Set: This is an unordered and unindexed collection type. No duplicate members allow.
- Dictionary: This is a collection that is unordered, changeable and indexed. No duplicate members allows.
List
A list is a collection that is ordered and changeable. The Python lists are defined with square brackets.
list_a = ["success", "danger", "running"] print(list_a)
Tuple
A tuple is a collection that is ordered and unchangeable. The Python tuples are written with round brackets.
tuple_a = ("success", "danger", "running")
print(tuple_a)Sets
A set is a collection that is unordered and unindexed. You can define sets using curly bracket :
sets_a = {"success", "danger", "running"}
print(sets_a)Dictionary
A Dictionary is a collection that is unordered, changeable and indexed. You can define a python dictionary using a curly bracket. The Dictionary has key-value pair.
dict_a = {"green" : "success", "red" : "danger", "yellow" : "running"}
print(dict_a)