How to use counter in python 3.10

What is Python Counter?

Python counter class is subclass of dictionary and it is a part of collection modules. we know that  python counter is like as container which select track to how many times equivalent values are added.python counter count all positive, zero or negative integer value. 

How to use  counter in python 3-How to accessing-Arithmetic

how to make a counter in python and How to Initializing :

• sequence of item
• dictionary containing key
• counts, or with using keyword argument mapping string names to count.

import collections
print (collections.Counter(['x', 'y', 'z', 'x', 'x', 'y']))
print (collections.Counter({'y': 2, 'x': 3, 'z':1}))
print(collections.Counter(y=2, x=3, z=1))

Counter({'x': 3, 'y': 2, 'z': 1})
Counter({'x': 3, 'y': 2, 'z': 1})
Counter({'x': 3, 'y': 2, 'z': 1})

• To create an empty counter
• pass the counter with no argument 
• populate it via the update method.

import collections
sach = collections.Counter()
print('Initial: ', sach)
sach.update('loveloo')
print('Sequence: ', sach)
sach.update({'l': 3, 'o':2})
print('Dict: ', sach)

Output

Initial: Counter()
Sequence: Counter({'o': 3, 'l': 2, 'v': 1, 'e': 1})
Dict: Counter({'l': 5, 'o': 5, 'v': 1, 'e': 1})

how to add a counter in python  and How to Accessing Count

import collections
sach = collections.Counter('lovelloo')
for letter in 'loveyou':
   print('%s : %d' %(letter, sach[letter]))

Output

l : 3
o : 3
v : 1
e : 1
y : 0
u : 0

elements() method in python

import collections
sach = collections.Counter('loveyouso')
sach['z'] = 0
print(sach)
print(list(sach.elements()))

Output

Counter({'o': 3, 'l': 1, 'v': 1, 'e': 1, 'y': 1, 'u': 1, 's ': 1})

import collections
sach = collections.Counter()
sent = '''Love blur my vision; but after recede it, me can see more clearly than ever– sachin pagar
'''
for word in sent:sach.update(word.rstrip().lower())
print("show Three most common letters in the above sent: ")
for letter, count in sach.most_common(5):
print("%s: %7d" %(letter, count))

Output

show Three most common letters in the above sent:
e: 11
a: 07
o: 05

Arithmetic

import collections
sach1 = collections.Counter(['a', 'b', 'a''c', 'a' ,'b', 'b'])
sach2 = collections.Counter('alphabet')
print('sach1: ', sach1)
print('sach2: ', sach2)
print ('n get result Combined counts: ')
print(sach1 + sach2)
print('n get result Subtraction: ')
print(sach1 - sach2)
print('n get Intersection result:')
print(sach1 & sach2)
print('n get Union result:')
print(sach1 | sach2)

Output

sach1: Counter({'b': 3, 'a': 3, 'c': 1})
sach2: Counter({'a': 3, 'l': 1, 'p': 1, 'h': 1, 'b': 1, 'e': 1, 't': 1})
get result Combined counts:
Counter({'a': 5, 'b': 4, 'c': 1, 'l': 1, 'p': 1, 'h': 1, 'e': 1, 't': 1})
get result Subtraction:
Counter({'b': 2, 'c': 1})
get Intersection result:
Counter({'a': 3, 'b': 1})
get Union result:
Counter({'b': 3, 'a': 5, 'c': 1, 'l': 1, 'p': 1, 'h': 1, 'e': 1, 't': 1})