Python Lesson 4

Lesson # 4

Hi All

,

In lesson 3 we start to learn the collection in python. We finish list. Today we learn more collection types.

Tuples

A tuple is collection which is ordered and unchangeable. It similar to List but only difference is once you create the tuple you are not able to change the orders, didn’t add more items, unchangeable.

But yes, there is ways to add items or modify the values in tuple.

If you need to add value in tuple, you need to create another tuple and join both.

If you need to modify the tuple value, cast tuple into list, modify the value and again cast list to tuple.

Example of tuple

MyTuple = (“Banan”, “Apple”)

In tuple ( ) brackets are used to declare and initialize the tuple.

You can use count() and index() methods to search the values in tuple.

Sets

Sets is collection with unordered and unindexed data. It means there is no index associated with value.

{ } brackets are used to declare and initialize the sets.

To access the sets you need to use for loop because there is no index associated with sets.

Example

MySet = {“banana”,”mango”,”apple”}

For x in MySet:

    print(x)

Then you can use if-condition to check the value and do further operations.

Once you create set you are not able to change the value because there is no indexing. But you can add new items

For add one value use add() method and for more than one value use update() method

MySets = {“banana”}

MySets.add(“new value 1”)

MySets.update([“new value 2”,”new value 3”])

Dictionary

After list, dictionary is collection that mostly used by programmers. Dictionary is collection that’s un-ordered but changeable and indexed. Dictionary have key paired value.

Example

MyDict = {

“key1”:”value1”,

“key2”;”value2”

}

To access the items use

Value = MyDist[“key1”] -> value1

You can change the value by key.

You can use list methods in dictionary as well.

See you in lesson 5 😊