List Mathod/Function

List Method /Function

Method	Description
append()	Adds an element at the end of the list Example 1: Adding Element to a List # animals list animals = ['cat', 'dog', 'rabbit'] # 'guinea pig' is appended to the animals list animals.append('guinea pig') # Updated animals list print('Updated animals list: ', animals) Output Updated animals list:  ['cat', 'dog', 'rabbit', 'guinea pig'] Example 2: Adding List to a List # animals list animals = ['cat', 'dog', 'rabbit'] # list of wild animals wild_animals = ['tiger', 'fox'] # appending wild_animals list to the animals list animals.append(wild_animals) print('Updated animals list: ', animals) output Updated animals list:  ['cat', 'dog', 'rabbit', ['tiger', 'fox']]
clear()	Removes all the elements from the list Example : >>>fruits = ['apple', 'banana', 'cherry', 'orange'] >>>fruits.clear() >>>print(fruits) []
copy()	Returns a copy of the list. For Example >>> Name=["Ankita", "Vanshika", "Shikha","Anshu","Aviral","Anchit"] >>> print(Name) #display list ['Ankita', 'Vanshika', 'Shikha', 'Anshu', 'Aviral', 'Anchit'] >>> sName=Name.copy() #copying list >>> print("Copied List :",sName) Output Copied List : ['Ankita', 'Vanshika', 'Shikha', 'Anshu', 'Aviral', 'Anchit'] >>> sName1=Name[2::] #copying slice list >>> print(sName1)  Output ['Shikha', 'Anshu', 'Aviral', 'Anchit'] >>> sName2=Name[::3] #copying slice list >>> print("Copied Slice :",sName2) Output Copied Slice : ['Ankita', 'Anshu']
count()	Returns the number of elements with the specified value For Example >>> Name=["Ankita", "Vanshika", "Shikha","Anshu","Aviral","Anchit","Shikha"] >>> print("Name Shikha ",Name.count("Shikha"), "times.") Output Name Shikha  2 times.
extend()	Add the elements of a list (or any iterable), to the end of the current list For Example >>> Age=[43,65,23,43,76] >>> youngAge=[8,13,15] >>> Age.extend(youngAge) >>> print(Age) Output [43, 65, 23, 43, 76, 8, 13, 15]
index()	Returns the index of the first element with the specified value syntax : list.index(element, start, end) list index() parameters The list index() method can take a maximum of three arguments: ·         element - the element to be searched ·         start (optional) - start searching from this index ·         end (optional) - search the element up to this index ·         For Example : ·         >>> Name=["Ankita", "Vanshika", "Shikha","Anshu","Aviral","Anchit","Shikha"] ·         >>> print("The Index of Aviral :",Name.index("Aviral")) ·         Output ·         The Index of Aviral : 4
insert()	Adds an element at the specified position Syntax: list.insert(i, elem) Where : ·         index - the index where the element needs to be inserted ·         element - this is the element to be inserted in the list Notes: ·         If index is 0, the element is inserted at the beginning of the list. ·         If index is 3, the element is inserted after the 3rd element. Its position will be 4th For example : >>> Age=[43,65,23,43,76] >>> Age.insert(3,99) >>> print("Updated List :",Age) Output Updated List : [43, 65, 23, 99, 43, 76]
pop()	Removes the element at the specified position Example 1: Pop item at the given index from the list # programming languages list languages = ['Python', 'Java', 'C++', 'French', 'C'] # remove and return the 4th item return_value = languages.pop(3) print('Return Value:', return_value) # Updated List print('Updated List:', languages) Output Return Value: French Updated List: ['Python', 'Java', 'C++', 'C'] Example 2: pop() without an index, and for negative indices # programming languages list languages = ['Python', 'Java', 'C++', 'Ruby', 'C'] # remove and return the last item print('When index is not passed:') print('Return Value:', languages.pop()) print('Updated List:', languages) # remove and return the last item print('\nWhen -1 is passed:') print('Return Value:', languages.pop(-1)) print('Updated List:', languages) # remove and return the third last item print('\nWhen -3 is passed:') print('Return Value:', languages.pop(-3)) print('Updated List:', languages) Output When index is not passed: Return Value: C Updated List: ['Python', 'Java', 'C++', 'Ruby'] When -1 is passed: Return Value: Ruby Updated List: ['Python', 'Java', 'C++'] When -3 is passed: Return Value: Python Updated List: ['Java', 'C++']
remove()	Removes the first item with the specified value For Example Example 1: Remove element from the list # animals list animals = ['cat', 'dog', 'rabbit', 'guinea pig'] # 'rabbit' is removed animals.remove('rabbit') # Updated animals List print('Updated animals list: ', animals) Output : Updated animals list:  ['cat', 'dog', 'guinea pig']   Example 2: remove() method on a list having duplicate elements If a list contains duplicate elements, the remove() method only removes the first matching element. # animals list animals = ['cat', 'dog', 'dog', 'guinea pig', 'dog'] # 'dog' is removed animals.remove('dog') # Updated animals list print('Updated animals list: ', animals) Output : Updated animals list:  ['cat', 'dog', 'guinea pig', 'dog']
reverse()	Reverses the order of the list For Example : Reverse a List >>> languages = ['Python', 'Java', 'C++', 'Ruby', 'C'] >>> languages.reverse() >>> languages ['C', 'Ruby', 'C++', 'Java', 'Python'] For Example : Reverse a List Using Slicing Operator # Operating System List systems = ['Windows', 'macOS', 'Linux'] print('Original List:', systems) # Reversing a list   #Syntax: reversed_list = systems[start:stop:step] reversed_list = systems[::-1] # updated list print('Updated List:', reversed_list) Original List: ['Windows', 'macOS', 'Linux'] Updated List: ['Linux', 'macOS', 'Windows']
sort()	Sorts the list For Example >>> languages = ['Python', 'Java', 'C++', 'Ruby', 'C'] >>> languages Output ['C', 'C++', 'Java', 'Python', 'Ruby'] For example >>> Score=[43,45,98,23,56,78,90,14] >>> Score.sort() >>> Score Output [14, 23, 43, 45, 56, 78, 90, 98]