PYTHON

Counter in python

from collections import Counter
strl = "aabbaba"
print(Counter(str1))

Counter({'a': 4, 'b': 3})

python counter

import collections

arr = ['a', 'a', 'b', 'b', 'b', 'c']

# set the elements frequencies using Counter class
elements_count = collections.Counter(arr)

# printing the element and the frequency
for key, value in elements_count.items():
    print(f"{key}: {value}")

# output
# a: 2
# b: 3
# c: 1


data = 'hello world'

# set the elements frequencies using Counter class
elements_count = collections.Counter(data)

# printing the element and the frequency
print(elements_count)

counter python

>>> # Tally occurrences of words in a list
>>> cnt = Counter()
>>> for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:
...     cnt[word] += 1
>>> cnt
Counter({'blue': 3, 'red': 2, 'green': 1})

>>> # Find the ten most common words in Hamlet
>>> import re
>>> words = re.findall(r'w+', open('hamlet.txt').read().lower())
>>> Counter(words).most_common(10)
[('the', 1143), ('and', 966), ('to', 762), ('of', 669), ('i', 631),
 ('you', 554),  ('a', 546), ('my', 514), ('hamlet', 471), ('in', 451)]

counter in python

import collections

print collections.Counter(['a', 'b', 'c', 'a', 'b', 'b'])
print collections.Counter({'a':2, 'b':3, 'c':1})
print collections.Counter(a=2, b=3, c=1)

python counter

>>> from collections import Counter
>>> colors = ['blue', 'blue', 'blue', 'red', 'red']
>>> counter = Counter(colors)
>>> counter['yellow'] += 1
Counter({'blue': 3, 'red': 2, 'yellow': 1})
>>> counter.most_common()[0]
('blue', 3)

.counter python

import collections

number = [0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1]
collections.Counter(number)

#output
#Counter({0: 12, 1: 9})

python counter

>>> Counter('abracadabra').most_common(3)
[('a', 5), ('r', 2), ('b', 2)]

counter library python

import collections

c = collections.Counter()
print 'Initial :', c

c.update('abcdaab')
print 'Sequence:', c

c.update({'a':1, 'd':5})
print 'Dict    :', c

counter in python

$ python collections_counter_init.py

Counter({'b': 3, 'a': 2, 'c': 1})
Counter({'b': 3, 'a': 2, 'c': 1})
Counter({'b': 3, 'a': 2, 'c': 1})

counter method in python

Counter({'x': 4, 'y': 2, 'z': 2})

counter method in python

Counter({'o': 3, ' ': 3, 'u': 3, 'e': 2, 'l': 2, 't': 2, 'r': 2, '9': 2, 'W': 1,
 'c': 1, 'm': 1, 'G': 1, 'T': 1, 'i': 1, 'a': 1, 's': 1, '!': 1})

python counter

sum(c.values())                 # total of all counts
c.clear()                       # reset all counts
list(c)                         # list unique elements
set(c)                          # convert to a set
dict(c)                         # convert to a regular dictionary
c.items()                       # convert to a list of (elem, cnt) pairs
Counter(dict(list_of_pairs))    # convert from a list of (elem, cnt) pairs
c.most_common()[:-n-1:-1]       # n least common elements
c += Counter()                  # remove zero and negative counts

Counter() Function

c = Counter("thiiss wiill caalcullateeee theee numbeeer of characters")

# now when we print c, it will have the following data:

Counter({'e': 11, ' ': 6, 'l': 5, 'a': 5, 't': 4, 'i': 4, 'c': 4, 'h': 3, 's': 3, 'r': 3, 'u': 2, 'w': 1, 'n': 1, 'm': 1, 'b': 1, 'o': 1, 'f': 1})

# And now we can check the occurrence of each of the characters as follows:

count_e = c.get('e') # returns 11

python : a counter

import time
from time import sleep, time

can_run = True
the_number = 0

end_number = 11 #you can change the number to be last counted

while can_run:
    print(the_number)
    sleep(1)
    the_number = the_number + 1
    if  the_number == end_number: 
        can_run = False

python counter

>>> c = Counter(a=4, b=2, c=0, d=-2)
>>> d = Counter(a=1, b=2, c=3, d=4)
>>> c.subtract(d)
>>> c
Counter({'a': 3, 'b': 0, 'c': -3, 'd': -6})

counter method in python

from collections import Counter
my_str = "Welcome to Guru99 Tutorials!"
print(Counter(my_str))