Change language

# Python | Get unique values ​​from a list

| |

Examples :

Input: 10 20 10 30 40 40 Output: 10 20 30 40 Input: 1 2 1 1 3 4 3 3 5 Output: 1 2 3 4 5

Method 1: traversing the list

Using traversal, we can traverse for each element in the list and check if an item in the unique_list, if it is not there, then we can add it to the unique_list. This is done using one for a for loop and another if statement that checks if a value is in a unique list or not, which is equivalent to another for a loop.

 # Python program to check if two # get unique values ​​from the list # use bypass   # function to get unique values ​​ def unique (list1):    # use an empty list unique_list = []   # move for all elements for x in list1: # check if unique_list exists or not if x not in unique_list:   unique_list.append (x) # print list for x in unique_list:   print x,       # driver code list1 = [ 10 , 20 , 10 , 30 , 40 , 40 ] print ( " the unique values ​​from 1st list is " ) unique (list1)      list2 = [ 1 , 2 , 1 , 1 , 3 , 4 , 3 , 3 , 5 ] print ( " the unique values ​​from 2nd list is " ) unique (list2)

Exit:

the unique value s from 1st list is 10 20 30 40 the unique values ​​from 2nd list is 1 2 3 4 5

Method 2: Using Set

Using the

# Python program to check if two
# get unique values ​​from the list
# using a set

# function to get unique values ​​

def unique (list1):

# insert list into set

list_set = set (list1)

# convert set to list

unique_list = ( list (list_set))

for x in unique_list:

print x,

# driver code

list1 = [ 10 , 20 , 10 , 30 , 40 , 40 ]

print ( "the unique values ​​from 1st list is" )

unique (list1)

list2 = [ 1 , 2 , 1 , 1 , 3 , 4 , 3 , 3 , 5 ]

print ( "the unique values ​​from 2nd list is" )

unique (list2)

Exit :

the unique values ​​from 1st list is 40 10 20 30 the unique values ​​from 2nd list is 1 2 3 4 5

Method 3: Using numpy.unique

Using Python import numpy also produces unique elements in an array. First, convert the list to x = numpy.array (list), and then use the numpy.unique (x) function to get unique values ​​from the list.  numpy.unique () only returns unique values ​​in the list.

 # Ppython program to check if two # get unique values ​​from the list # using numpy.unique import numpy as np   # function for getting unique values ​​ def unique (list1 ): x = np.array (list1) print (np.unique (x))     # driver code list1 = [ 10 , 20 , 10 , 30 , 40 , 40 ] print ( "the unique values ​​from 1st list is" ) unique (list1)      list2 = [ 1 , 2 , 1 , 1 , 3 , 4 , 3 , 3 , 5 ] print ( "the unique values ​​from 2nd list is" ) unique ( list2)

Exit

the unique values ​​from 1st list is [10 20 30 40] the unique values ​​from 2nd list is [1 2 3 4 5]

## Shop

Learn programming in R: courses

\$

Best Python online courses for 2022

\$

Best laptop for Fortnite

\$

Best laptop for Excel

\$

Best laptop for Solidworks

\$

Best laptop for Roblox

\$

Best computer for crypto mining

\$

Best laptop for Sims 4

\$

Latest questions

NUMPYNUMPY

psycopg2: insert multiple rows with one query

12 answers

NUMPYNUMPY

How to convert Nonetype to int or string?

12 answers

NUMPYNUMPY

How to specify multiple return types using type-hints

12 answers

NUMPYNUMPY

Javascript Error: IPython is not defined in JupyterLab

12 answers

## Wiki

Python OpenCV | cv2.putText () method

numpy.arctan2 () in Python

Python | os.path.realpath () method

Python OpenCV | cv2.circle () method

Python OpenCV cv2.cvtColor () method

Python - Move item to the end of the list

time.perf_counter () function in Python

Check if one list is a subset of another in Python

Python os.path.join () method