Python

list datatype:

• Order sequence that can hold a variety of object types.
• list support indexing & splicing operation.
• list element can access through forward indexing or reverse indexing
• list can be nested and also have a variety of useful methods that can be called them to perform operation.
• list is mutuable. That means, - we can change element with the help of indexing.

Example, -

Input =>
my_list = [1, 'Two', 23.0, 'Three']
print(my_list)
Output =>
[1, 'Two', 23.0, 'Three']

List operations

Input =>
my_list = ['One', 'Two', 'Three', 'Four', 'Five', 'Six']

Indexing Operations:

Input	Output
my_list[0]	‘One’
my_list[5]	‘Six’
my_list[-2]	‘Five’

Slice Operations:

Input	Output
my_list[2:]	[‘Three’, ‘Four’, ‘Five’, ‘Six’]
my_list[:3]	[‘Once’, ‘Two’, ‘Three’]
my_list[2:5]	[‘Three’, ‘Four’]
my_list[::]	[‘One’, ‘Two’, ‘Three’, ‘Four’, ‘Five’, ‘Six’]
my_list[::2]	[‘One’, ‘Three’, ‘Five’]
my_list[::3]	[‘One’, ‘Four’]
my_list[::-1]	[‘Six’, ‘Five’, ‘Four’, ‘Three’, ‘Two’, ‘One’]

Other useful methods:

Method	Usage	Output	Additional Information
len()	len(my_list)	6	Method use to calculate length of given list
append	my_list.append(‘Seven’)	[‘One’, ‘Two’, ‘Three’, ‘Four’, ‘Five’, ‘Six’, ‘Seven’]	Method use append new element at the end of list
pop()	pop_element = my_list.pop()	my_list = [‘One’, ‘Two’, ‘Three’, ‘Four’, ‘Five’, ‘Six’] pop_element = ‘Seven’	Method use to remove last element from the list. pop method also take index as parameter to remove element from specific location. we can use forward index or reverse index also.
sort()	my_list.sort()	sorted element list [‘One’, ‘Two’, ‘Three’, ‘Four’, ‘Five’, ‘Six’]	Method use to sort given list. This method does not return anything.
reverse()	my_list.reverse()	reverse element list [‘Six’, ‘Five’, ‘Four’, ‘Three’, ‘Two’, ‘One’]	Method use to reverse given list. This method does not return anything.

Some nested list example:

Input =>
my_list = ['One', 'Two', 'Three', 'Four', 'Five', 'Six', [1, 2, 3, 4]]
my_list[6][1]

Output =>
2

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