ARRAY OPERATIONS IN PYTHON :Arrays are used to store multiple values in one single variable:
Example
Create an array containing car names:
cars = ["Ford", "Volvo", "BMW"]
The Length of an Array
Use the len() method to return the length of an array (the number of elements in an array).
Example
Return the number of elements in the cars array:
x = len(cars)
Looping Array Elements
You can use the for in loop to loop through all the elements of an array.
Example
Print each item in the cars array:
for x in cars:
print(x)
Adding Array Elements
You can use the append() method to add an element to an array.
Example
Add one more element to the cars array:
cars.append("Honda")
Removing Array Elements
You can use the pop() method to remove an element from the array.
Example
Delete the second element of the cars array:
cars.pop(1)
Example
Delete the element that has the value "Volvo":
cars.remove("Volvo")
Array Methods
Python has a set of built-in methods that you can use on lists/arrays.
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 first item with the specified value
reverse():Reverses the order of the list
sort():Sorts the list
example:
import array as arr
numbers = arr.array('i', [1, 2, 3])
numbers.append(4)
print(numbers) # Output: array('i', [1, 2, 3, 4])
# extend() appends iterable to the end of the array
numbers.extend([5, 6, 7])
print(numbers)
import array as arr
number = arr.array('i', [1, 2, 3, 3, 4])
del number[2] # removing third element
print(number) # Output: array('i', [1, 2, 3, 4])
del number # deleting entire array
print(number)
import array as arr
numbers = arr.array('i', [10, 11, 12, 12, 13])
numbers.remove(12)
print(numbers) # Output: array('i', [10, 11, 12, 13])
print(numbers.pop(2)) # Output: 12
print(numbers)
