List & tuple & set & dictionary in Python

In this, we study what is the difference between List & tuple & set & dictionary in Python.

  • The list is a collection that is ordered and changeable. Allows duplicate members.
  • A tuple is a collection that is ordered and unchangeable. Allows duplicate members.
  • Set is a collection that is unordered and unindexed. No duplicate members.
  • Dictionary is a collection that is unordered, changeable and indexed. No duplicate members.

List & tuple & set & dictionary in Python

List & tuple & set & dictionary in Python

In Python, the array starts with 0.

1. List

  • The list is a collection that is ordered and changeable. Allows duplicate members.
  • In Python list is written with the Square bracket.
  • In List support both string and number.
  • Add and remove the elements is possible.

Example1:

l= ["zen" , "yen", "ken"]
print(l)
Output
>>['zen', 'yen', 'ken']

Example 2:

l= ["zen", 30 , "yen", 40 ]
print(l)
print(l[2])
print(l[2][0])
print(l[2][-1])
Output
['zen', 30, 'yen', 40]yen
y
n

List Methods

Python has a set of built-in methods that you can use on lists.

Method Description
append()Adds an element at the end of the list
clear()Removes all the elements from the list
copy()Returns a copy of the list
count()Returns the number of elements with the specified value
extend()Add the elements of a list (or any iterable), to the end of the current list
index()Returns the index of the first element with the specified value
insert()Adds an element at the specified position
pop()Removes the element at the specified position
remove()Removes the item with the specified value
reverse()Reverses the order of the list
sort()Sorts the list

2. Tuple

  • A tuple is a collection that is ordered and unchangeable. Allows duplicate members.
  • In Python, tuples are written with round brackets.
  • We cannot add and remove the elements

Example :

l= ("zen", 30 , "yen", 40 )
print(l)
Output
('zen', 30, 'yen', 40)

Tuple Methods

Python has two built-in methods that you can use on tuples.

Method Description
index()Searches the tuple for a specified value and returns the position of where it was found
count() Returns the number of times a specified value occurs in a tuple

3. Set

  • Set is a collection that is unordered and unindexed.
  • No duplicate members.
  • In Python, Set are written with curly brackets.

Example:

l= {"zen", 30 , "yen", 40 }
print(l)
Output
{40, 'yen', 'zen', 30}

Set Methods

Python has a set of built-in methods that you can use on sets.

Methods Description
add()Adds an element to the set
clear()Removes all the elements from the set
copy()Returns a copy of the set
difference()Returns a set containing the difference between two or more sets
difference_update()Removes the items in this set that are also included in another, specified set
discard()Removes the items in this set that are also included in another, specified set
intersection()Returns a set containing the difference between two or more sets
intersection_update()Removes the items in this set that are not present in other, specified set(s)
isdisjoint()Returns whether two sets have an intersection or not
issubset()Returns whether another set contains this set or not
issuperset()() Returns whether this set contains another set or not
pop()Removes an element from the set
remove()Removes the specified element
symmetric_difference()Returns a set with the symmetric differences of two sets
symmetric_difference_update()inserts the symmetric differences from this set and another
union()Return a set containing the union of sets
update()Update the set with the union of this set and others

4. Dictionary

  • Dictionary is a collection that is unordered, changeable and indexed.
  • No duplicate members.
  • In Python, dictionaries are written with curly brackets, and they have keys and values.

Example:

l= {"zen":30, "ben":40 , "yen":50, "ten":60 }
print(l)
Output
{'zen': 30, 'ben': 40, 'yen': 50, 'ten': 60}

Dictionary Methods

Python has a set of built-in methods that you can use on dictionaries.

Methods Description
clear()Removes all the elements from the dictionary
copy()Returns a copy of the dictionary
fromkeys()Returns a dictionary with the specified keys and value
get()Returns the value of the specified key
items()Returns a list containing a tuple for each key-value pair
keys()Returns a list containing the dictionary’s keys
pop()Removes the element with the specified key
popitem()Removes the last inserted key-value pair
setdefault()Returns the value of the specified key. If the key does not exist: insert the key, with the specified value
update()Updates the dictionary with the specified key-value pairs
values()Returns a list of all the values in the dictionary

Source:- w3schools

Also View:- Python Function-lambda |filter, map, reduce.

Also View: – Write a program to create a registration form using AWT.

About Ashishkumar Vishwakarma

I am Ashish- a Developer and Artist live in Mumbai.

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