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Counters in Python | Set 2 (Access to counters)

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After initialization, counters are available in the same way as dictionaries. Also, it does not throw a KeyValue error (if the key is missing), and the counter value is displayed as 0.

Example:

# Python program to demonstrate access to
# Item counter

from collections import Counter

 
# Create list

z = [ ’blue’ , ’ red’ , ’blue’ , ’yellow’ ,  ’blue’ , ’ red’ ]

col_count = Counter (z)

print (col_count)

 

col = [ ’blue’ , ’ red’ , ’yellow’ , ’ green’ ]

 
# There is no green here in col_count
# so the green counter is zero

for color in col:

print (color, col_count [color])

Output:

 Counter ({’blue’: 3,’ red’: 2, ’yellow’: 1}) blue 3 red 2 yellow 1 green 0 

elements ():
The elements () method returns an iterator that produces all the elements known to Counter. 
Note: Items with "= 0 are not included.

Example:

# Python example to showcase () elements on
# Counter (returns a list)

from collections import Counter

 

coun = Counter (a = 1 , b = 2 , c = 3 )

print (coun)

  

print ( list (coun.elements ()))

Output:

 Counter ({’c’: 3,’ b’: 2, ’a’: 1}) [ ’a’,’ b’, ’b’,’ c’, ’c’,’ c’] 

most common ():
Most_common () used to get a sequence of the n most common input values ​​and their corresponding values.

# Python example to demonstrate most_elements () on
# Counter

from collections import Counter

 

coun = Counter (a = 1 , b = 2 , c = 3 , d = 120 , e = 1 , f = 219 )

 
# This prints the 3 most common characters

for letter, count in coun.most_common ( 3 ):

print ( ’% s:% d’ % (letter, count))


Output:

 f: 219 d: 120 c: 3 

This article is updated Mayank Rawata If you love Python.Engineering and would like to contribute, you can also write an article using contribute.python.engineering or by mailing the article [email protected] See my article appearing on the Python.Engineering homepage and help other geeks.

Please post comments if you find anything wrong or if you would like to share more information on the topic discussed above.

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