Python | Get unique values from a list

get unique values | NumPy | Python Methods and Functions

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]

Python | Get unique values from a list: StackOverflow Questions

Get unique values from a list in python

I want to get the unique values from the following list:

["nowplaying", "PBS", "PBS", "nowplaying", "job", "debate", "thenandnow"]

The output which I require is:

["nowplaying", "PBS", "job", "debate", "thenandnow"]

This code works:

output = []
for x in trends:
    if x not in output:
        output.append(x)
print(output)

is there a better solution I should use?

Python: The Bible

Introducing Data Science

Practical Cryptography in Python

Python Workout: 50 TEN-MINUTE EXERCISES

Python | Get unique values from a list

Python | Get unique values from a list: StackOverflow Questions

Get unique values from a list in python

Books for developers

Submit new EBook

Python | Get unique values ​​from a list

Python | Get unique values ​​from a list: StackOverflow Questions

Get unique values from a list in python

Books for developers

Python: The Bible

Introducing Data Science

Practical Cryptography in Python

Python Workout: 50 TEN-MINUTE EXERCISES

Submit new EBook

Python | Get unique values from a list

Python | Get unique values from a list: StackOverflow Questions