List Python Data Structures are collections of objects and are mutable, have no fixed size. As lists are both mutable(can be changed) and have no fixed size(size can increase or decrease). That’s why there does exist many methods in Python which can specifically be applied. Let’s get straight into What list methods does Python have?
Below is a table containing List Method Names and Description. After the table, I’ve also put together some examples for each one of List Method so as to help you in better understanding these List Methods and how you can use these into your code.
Table of Contents
List Methods in Python
| List Method | Description |
|---|---|
| append() | Adds newer elements at end of list |
| clear() | Removes all elements from list |
| copy() | Returns a copy of list |
| count() | Returns number of times some specified value occurs in a Python List |
| extend() | Adds the elements of some list/iterable to end of specified list |
| index() | Returns index of position where some specified value occurred first time |
| insert() | Add an elements to some specified position in a list |
| pop() | Removes element from specified position |
| remove() | Removes first occurance of specified element from list |
| reverse() | Reverses order of elements in list |
| sort() | Sorts the list in Ascending Order |
append() List Method in Python
Syntax : list.append()
This method can be used for adding values to list. While using this method just keep in mind that it add values to end of list.
Below are some code examples showing How to use append() List Method?
# Creating two Python Lists
list1 = [20, 28, 81, 192]
list2 = ["ComputerScienceHub", "Python Programming", "JavaScript Progamming"]
# Appending to list1
list1.append("78")
print(list1) # Returns [20, 28, 81, 192, 78]
# Appending to list2
list2.append("Go Programming Language")
print(list2) # Returns ["ComputerScienceHub", "Python Programming", "JavaScript Progamming", "Go Programming Language"]clear() List Method in Python
Syntax : list.clear()
Removes all elements from list and turn it into an empty list. This method can be useful in scenarios where you need to hold some data as a temporary entity in your program.
Below are code examples showing How to use clear() method in Python?
# Creating a Python List
list1 = [9, 19, 124, 282]
# Clearing list
list1.clear()
print(list1) # This will returns [] an empty Python Listcopy() List Method in Python
Syntax : list.copy()
Makes a newer copy of a list. Please note here that .copy() method is not assigning a new reference to same memory location where list was stored. Rather it allocates some memory for newer list. For example – If we have list1 = [18, 29, 12] and doing list2 = list1.copy() will create a newer memory location for list2. So if in case any change is made to list1 then list2 would not change accordingly.
Below are code examples showing How to use copy() method in Python?
# Creating a Python List
list1 = [28, 91, 9]
# Copying list
list2 = list1.copy()
print(list2) # Returns [28, 91, 9]count() List Method in Python
Syntax : list.count(some string)
Returns number of times some specified value occurs in a Python List.
Below are code examples showing How to use count() method in Python?
# Creating a Python List
list1 = [18, 92, 192, 182, 163, 18, 64, 18, 362]
# Counting number of times it contain 18 value in it
list1.count(18) # Returns 3extend() List Method in Python
Syntax : list.extend(iterable object)
Adds the elements of some list/iterable to end of the specified list.
# Creating a Python List
list1 = [28, 91, 65, 73]
# Extending list
list1.extend([994, 283])
print(list1) # Returns [28, 91, 65, 73, 994, 283]index() List Method in Python
Syntax : list.index(number)
Returns index of position where some specified value occurred first time.
# Creating a Python List
list1 = [37, 29, 27]
list1.index(19) # Returns 1 as number 29 is at index position 1 in listinsert() List Method in Python
Syntax : list.insert(index, value)
Add an elements to some specified position in a list. This function can add some value at a specific index position meaning it would update index positions of other elements in list. For example – If for list1 = [19, 28, 17], we do list1.index(1, 373) then list1 will become [19, 373, 28, 17]. Here you can see clearly that position of 28 have shifted from being 1 to 2.
So keep in mind that insert() List Method can update index positions of some elements.
# Creating a Python List
list1 = [38, 29, 17]
list1.insert(1, 37)
print(list1) # Returns [38, 37, 29, 17]pop() List Method in Python
Syntax : list.pop(optional index)
Removes element from specified position if index is passed in, but if index is not passed in then removes element from end of list.
# Creating a Python List
list1 = [37, 91, 284, 29]
list1.pop() # No index value is passed in, so removes last element from list
print(list1) # Returns [37, 91, 284]
# Now list1 is [37, 91, 284]
list1.pop(1) # Removes value at index position 1
print(list1) # Returns [37, 284]remove() List Method in Python
Syntax : list.remove(value)
Removes first occurance of specified element from list. Please note here that if value is occurring more than once in list then remove() will only kick out first occurrence of value.
# Creating a Python List
list1 = [8, 92, 274, 28, 8, 92, 293]
list1.remove(8) # Removes first occurrence of 8 in list1
print(list1) # Returns [92, 274, 28, 8, 92, 293] note second 8 is still therereverse() List Method in Python
Syntax : list.reverse()
Reverses order of elements in list.
# Creating a Python List
list1 = [38, 92, 182, 192]
list1.reverse()
print(list1) # Returns [192, 182, 92, 38]sort() List Method in Python
Syntax : list.sort()
Sorts the list in Ascending Order.
# Creating a Python List
site1 = [38, 19, 56, 24]
site1.sort()
print(site1) # Returns [24, 56, 19, 38]
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