Python Arrays
Learn all about Python Arrays in this comprehensive tutorial.
- •Arrays are used to store multiple values in one single variable:
- •An array is a special variable, which can hold more than one value at a time.
- •You refer to an array element by referring to the index number.
- •Use the len() method to return the length of an array (the number of elements in an array).
- •You can use the for in loop to loop through all the elements of an array.
- •You can use the append() method to add an element to an array.
- •You can use the pop() method to remove an element from the array.
- •Python has a set of built-in methods that you can use on lists/arrays.
Introduction
Arrays
Arrays are used to store multiple values in one single variable:
What is an Array?
An array is a special variable, which can hold more than one value at a time.
If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this:
However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300?
The solution is an array!
An array can hold many values under a single name, and you can access the values by referring to an index number.
Access the Elements of an Array
You refer to an array element by referring to the index number.
The Length of an Array
Use the len() method to return the length of an array (the number of elements in an array).
Looping Array Elements
You can use the for in loop to loop through all the elements of an array.
Adding Array Elements
You can use the append() method to add an element to an array.
Removing Array Elements
You can use the pop() method to remove an element from the array.
You can also use the remove() method to remove an element from the array.
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 |
Module quiz
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