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How to Remove Duplicates From a Python List

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Learn how to remove duplicates from a List in Python.

Tóm lược đại ý quan trọng trong bài

• How to Remove Duplicates From a Python List
• Example Explained
• A List with Duplicates
• Create a Dictionary
• Convert Into a List
• Print the List
• Create a Function
• Example Explained
• Create a Function
• Create a Dictionary
• Convert Into a List
• Return List
• Call the Function
• Print the Result

Example

Remove any duplicates from a List:

mylist = [“a”, “b”, “a”, “c”, “c”]
mylist = list(dict.fromkeys(mylist))
print(mylist)
Try it Yourself »

Example Explained

First we have a List that contains duplicates:

A List with Duplicates

mylist = [“a”, “b”, “a”, “c”, “c”]


mylist = list(dict.fromkeys(mylist))
print(mylist)

Create a dictionary,
using the List items as keys. This will automatically remove any duplicates
because dictionaries cannot have duplicate keys.

Create a Dictionary

mylist = [“a”, “b”, “a”, “c”, “c”]

mylist = list(dict.fromkeys(mylist))
print(mylist)

Then, convert the dictionary back into a list:

Convert Into a List

mylist = [“a”, “b”, “a”, “c”, “c”]

mylist = list(dict.fromkeys(mylist))
print(mylist)

Now we have a List without any duplicates, and it has the same order as the
original List.

Print the List to demonstrate the result

Print the List

mylist = [“a”, “b”, “a”, “c”, “c”]
mylist = list(dict.fromkeys(mylist))

print(mylist)

Create a Function

If you like to have a function where you can send your lists, and get them
back without duplicates, you can create a function and insert the code from the
example above.

Example

def my_function(x):
return list(dict.fromkeys(x))

mylist =
my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)
Try it Yourself »

Example Explained

Create a function that takes a List as an argument.

Create a Function

def my_function(x):
return list(dict.fromkeys(x))

mylist =
my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)

Create a dictionary, using this List items as keys.

Create a Dictionary

def my_function(x):
return list(dict.fromkeys(x))

mylist =
my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)

Convert the dictionary into a list.

Convert Into a List

def my_function(x):
return list(dict.fromkeys(x))

mylist =
my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)

Return the list

Return List

def my_function(x):
return list(dict.fromkeys(x))

mylist =
my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)

Call the function, with a list as a parameter:

Call the Function

def my_function(x):
return list(dict.fromkeys(x))

mylist = my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)

Print the result:

Print the Result

def my_function(x):
return list(dict.fromkeys(x))

mylist = my_function([“a”, “b”, “a”, “c”, “c”])

print(mylist)

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