In this Python article we are going to talk about 10 Essential Python List Methods, Python lists are one of the most commonly used data structures in Python programming. they are powerful, mutable and can hold different types of data. in this article we are going to cover 10 essential Python list methods that every Python programmer should know.
10 Essential Python List Methods
- append(): this method is used to add an element to the end of a list. for example:
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my_list = [1, 2, 3] my_list.append(4) print(my_list) # [1, 2, 3, 4] |
- extend(): this method is used to add multiple elements to the end of a list. it takes an iterable such as another list and appends each element to the end of the list. for example:
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my_list = [1, 2, 3] my_list.extend([4, 5, 6]) print(my_list) # [1, 2, 3, 4, 5, 6] |
- insert(): this method is used to insert an element at specific index in a list. the first argument is the index, and the second argument is the value to be inserted. for example:
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my_list = [1, 2, 3] my_list.insert(1, 4) print(my_list) # [1, 4, 2, 3] |
- remove(): this method is used to remove the first occurrence of value from a list. for example:
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my_list = [1, 2, 3, 2] my_list.remove(2) print(my_list) # [1, 3, 2] |
- pop(): this method is used to remove and return an element from specific index in a list. if no index is specified, it removes and returns the last element of the list. for example:
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my_list = [1, 2, 3] popped_element = my_list.pop(1) print(popped_element) # 2 print(my_list) # [1, 3] |
- index(): this method is used to find first occurrence of a value in a list and return its index. if the value is not found, it raises ValueError. for example:
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my_list = [1, 2, 3, 2] index = my_list.index(2) print(index) # 1 |
- count(): this method is used to count the number of times a value appears in the list. for example:
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my_list = [1, 2, 3, 2] count = my_list.count(2) print(count) # 2 |
- sort(): this method is used to sort the elements of a list in ascending order. it modifies original list and does not return anything. for example:
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my_list = [3, 1, 2] my_list.sort() print(my_list) # [1, 2, 3] |
- reverse(): this method is used to reverse the order of the elements in a list. it modifies the original list and does not return anything. for example:
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my_list = [1, 2, 3] my_list.reverse() print(my_list) # [3, 2, 1] |
- copy(): this method is used to create copy of a list. the copy is new list with the same elements as the original list, but it is a separate object in memory. for example:
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my_list = [1, 2, 3] my_copy = my_list.copy() print(my_copy) # [1, 2, 3] |
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