filter () in python

Michael Zippo

syntax :

 filter (function, sequence)  Parameters:  function: function that tests if each element of a sequence true or not. sequence: sequence which needs to be filtered, it can be sets, lists, tuples, or containers of any iterators.  Returns:  returns an iterator that is already filtered.

       # function that filters vowels  
   def   fun (variable): 
    letters   =   [  ’a’  ,   ’e’  ,  ’ i’  ,  ’ o’  ,   ’u’  ] 
    if   (variable   in   letters): 
    return   True   
   else  : 
    return   False  
   
   
  # sequence  
   sequence   =   [  ’g’  ,  ’ e’  ,   ’e’  ,  ’ j’   ,   ’k’  ,  ’ s’  ,   ’p’  ,  ’ r’  ] 
   
  # using the filter function  
   filtered   =   filter   (fun, sequence) 
   
   print   (  ’The filtered letters are: ’ ) 
   for   s   in   filtered: 
    print   (s)

Exit :

 The filtered letters are: ee

Application:
Usually used with

# the list contains even and odd numbers.

seq = [ 0 , 1 , 2 , 3 , 5 , 8 , 13 ]

# result contains odd list numbers

result = filter ( lambda x: x % 2 , seq)

print ( list (result))

# result contains even list numbers

result = filter ( lambda x: x % 2 = = 0 , seq)

print ( list (result))

Exit:

[1, 3, 5, 13] [0, 2, 8]

Please refer to

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

News

19/08/2022 Study: iOS bug prevents VPN from fully encrypting traffic 19/08/2022 Media: production of systems-on-a-chip M2 Pro and M2 Max will begin at the end of 2022 19/08/2022 YouTube will automatically add watermarks to Shorts videos

Wiki

__del__

Python OpenCV | cv2.putText () method

__del__

numpy.arctan2 () in Python

__del__

Python | os.path.realpath () method

around

Python OpenCV | cv2.circle () method

cvtcolor

Python OpenCV cv2.cvtColor () method

Python functions

Python - Move item to the end of the list

Counters

time.perf_counter () function in Python

__dict__

Check if one list is a subset of another in Python

__del__

Python os.path.join () method