Python List Built-in functions
Table of Content:
Python provides the following built-in functions, which can be used with the lists.
| SN | Function | Description | Example |
|---|---|---|---|
| 1 | cmp(list1, list2) | It compares the elements of both the lists. | This method is not used in the Python 3 and the above versions. |
| 2 | len(list) | It is used to calculate the length of the list. |
L1 = [1,2,3,4,5,6,7,8]
print(len(L1))
8
|
| 3 | max(list) | It returns the maximum element of the list. |
L1 = [12,34,26,48,72] print(max(L1)) 72 |
| 4 | min(list) | It returns the minimum element of the list. |
L1 = [12,34,26,48,72] print(min(L1)) 12 |
| 5 | list(seq) | It converts any sequence to the list. |
str = "Johnson" s = list(str) print(type(s)) <class list> |
Python List/Array Methods
| Sr. No. | Method | Description | Example |
|---|---|---|---|
| 1 | append() | Adds an element at the end of the list | my_list = [1, 2, 3]my_list.append(4)print(my_list)Output: [1, 2, 3, 4] |
| 2 | clear() | Removes all the elements from the list | my_list = [1, 2, 3]my_list.clear()print(my_list)Output: [] |
| 3 | copy() | Returns a copy of the list | my_list = [1, 2, 3]new_list = my_list.copy()print(new_list)Output: [1, 2, 3] |
| 4 | count() | Returns the number of elements with the specified value | my_list = [1, 2, 2, 3, 2]count = my_list.count(2)print(count)Output: 3 |
| 5 | extend() | Add the elements of a list (or any iterable) to the end of the current list | my_list = [1, 2, 3]my_list.extend([4, 5])print(my_list)Output: [1, 2, 3, 4, 5] |
| 6 | index() | Returns the index of the first element with the specified value | my_list = [1, 2, 3, 2]index = my_list.index(2)print(index)Output: 1 |
| 7 | insert() | Adds an element at the specified position | my_list = [1, 2, 3]my_list.insert(1, 4)print(my_list)Output: [1, 4, 2, 3] |
| 8 | pop() | Removes the element at the specified position | my_list = [1, 2, 3]element = my_list.pop(1)print(element)Output: 2 |
| 9 | remove() | Removes the first item with the specified value | my_list = [1, 2, 3, 2]my_list.remove(2)print(my_list)Output: [1, 3, 2] |
| 10 | reverse() | Reverses the order of the list | my_list = [1, 2, 3]my_list.reverse()print(my_list)Output: [3, 2, 1] |
| 11 | sort() | Sorts the list | my_list = [3, 1, 2]my_list.sort()print(my_list)Output: [1, 2, 3] |