Python Array Methods

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Python Array Methods

Python lists (often used as arrays) come with many built-in methods that make it easy to manage, modify, and analyze data stored in them.

Below is a rewritten explanation of common array methods, along with updated and original examples.

Common Array Methods

append() – Add an Item to the End

Adds a single element at the end of the list.

colors = ["red", "blue", "green"] colors.append("yellow") print(colors)

Output:

['red', 'blue', 'green', 'yellow']

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clear() – Remove All Elements

Deletes all items from the list, making it empty.

numbers = [1, 2, 3, 4] numbers.clear() print(numbers)

Output:

[]

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copy() – Create a Shallow Copy

Returns a new list with the same elements.

original = ["pen", "pencil", "eraser"] duplicate = original.copy() print(duplicate)

Output:

['pen', 'pencil', 'eraser']

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count() – Count Occurrences of a Value

Returns how many times a value appears in the list.

scores = [85, 90, 85, 70, 85] print(scores.count(85))

Output:

3

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extend() – Add Multiple Elements

Adds elements from another iterable to the end of the list.

list1 = ["HTML", "CSS"] list2 = ["JavaScript", "Python"] list1.extend(list2) print(list1)

Output:

['HTML', 'CSS', 'JavaScript', 'Python']

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index() – Find Position of an Element

Returns the index of the first occurrence of a value.

animals = ["cat", "dog", "rabbit", "dog"] print(animals.index("dog"))

Output:

1

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insert() – Add an Element at a Specific Position

Inserts an element at the given index.

cities = ["Delhi", "Mumbai", "Chennai"] cities.insert(1, "Bengaluru") print(cities)

Output:

['Delhi', 'Bengaluru', 'Mumbai', 'Chennai']

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pop() – Remove an Element by Index

Removes and returns the element at the given position.

tasks = ["study", "exercise", "sleep"] removed_task = tasks.pop(0) print(removed_task) print(tasks)

Output:

study
['exercise', 'sleep']

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remove() – Remove an Element by Value

Removes the first matching value from the list.

items = ["apple", "banana", "cherry", "banana"] items.remove("banana") print(items)

Output:

['apple', 'cherry', 'banana']

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reverse() – Reverse the List Order

Reverses the elements of the list in place.

nums = [1, 2, 3, 4, 5] nums.reverse() print(nums)

Output:

[5, 4, 3, 2, 1]

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sort() – Sort the List

Sorts the list in ascending order by default.

marks = [88, 72, 95, 60, 83] marks.sort() print(marks)

Output:

[60, 72, 83, 88, 95]

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Sorting in descending order:

marks = [88, 72, 95, 60, 83] marks.sort(reverse=True) print(marks)

Output:

[95, 88, 83, 72, 60]

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Summary of Array Methods

Method	Purpose
append()	Add item at the end
clear()	Remove all elements
copy()	Create a duplicate list
count()	Count occurrences
extend()	Add multiple items
index()	Find element position
insert()	Add item at specific index
pop()	Remove item by index
remove()	Remove item by value
reverse()	Reverse list order
sort()	Sort list elements

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