Python العداد في المجموعات مع المثال

Counter(list)

list1 = ['x','y','z','x','x','x','y', 'z']

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

from collections import Counter

from collections import Counter
list1 = ['x','y','z','x','x','x','y', 'z']
print(Counter(list1))

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

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

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})

from collections import Counter
list1 = ['x','y','z','x','x','x','y','z']
print(Counter(list1))

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

from collections import Counter
dict1 =  {'x': 4, 'y': 2, 'z': 2, 'z': 2}
print(Counter(dict1))

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

from collections import Counter
tuple1 = ('x','y','z','x','x','x','y','z')
print(Counter(tuple1))

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

from collections import Counter
print(Counter("Welcome to Guru99 Tutorials!"))   #using string
print(Counter(['x','y','z','x','x','x','y', 'z'])) #using list
print(Counter({'x': 4, 'y': 2, 'z': 2})) #using dictionary
print(Counter(('x','y','z','x','x','x','y', 'z'))) #using tuple

from collections import Counter
_count = Counter()

_count.update('Welcome to Guru99 Tutorials!')

from collections import Counter
_count = Counter()
_count.update('Welcome to Guru99 Tutorials!')
print(_count)

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})

from collections import Counter

_count = Counter()
_count.update('Welcome to Guru99 Tutorials!')
print('%s : %d' % ('u', _count['u']))
print('\n')
for char in 'Guru':
    print('%s : %d' % (char, _count[char]))

u : 3

G : 1
u : 3
r : 2
u : 3

from collections import Counter
dict1 =  {'x': 4, 'y': 2, 'z': 2}
del dict1["x"]
print(Counter(dict1))

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

from collections import Counter
counter1 =  Counter({'x': 4, 'y': 2, 'z': -2})

counter2 = Counter({'x1': -12, 'y': 5, 'z':4 })

#Addition
counter3 = counter1 + counter2 # only the values that are positive will be returned.

print(counter3)

#Subtraction
counter4 = counter1 - counter2 # all -ve numbers are excluded.For example z will be z = -2-4=-6, since it is -ve value it is not shown in the output

print(counter4)

#Intersection
counter5 = counter1 & counter2 # it will give all common positive minimum values from counter1 and counter2

print(counter5)

#Union
counter6 = counter1 | counter2 # it will give positive max values from counter1 and counter2

print(counter6)

Counter({'y': 7, 'x': 4, 'z': 2})
Counter({'x1': 12, 'x': 4})
Counter({'y': 2})
Counter({'y': 5, 'x': 4, 'z': 4})

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 2, 'z': -2, 'x1':0})

_elements = counter1.elements() # will give you all elements with positive value and count>0
for a in _elements:
    print(a)

x
x
x
x
x
y
y

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 12, 'z': -2, 'x1':0})

common_element = counter1.most_common(2) # The dictionary will be sorted as per the most common element first followed by next.
print(common_element)

common_element1 = counter1.most_common() # if the value is not given to most_common , it will sort the dictionary and give the most common elements from the start.The last element will be the least common element.
print(common_element1)

 [('y', 12), ('x', 5)]
[('y', 12), ('x', 5), ('x1', 0), ('z', -2)]

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 12, 'z': -2, 'x1':0})
counter2 = Counter({'x': 2, 'y':5})

counter1.subtract(counter2)
print(counter1)

Counter({'y': 7, 'x': 3, 'x1': 0, 'z': -2})

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 12, 'z': -2, 'x1':0})
counter2 = Counter({'x': 2, 'y':5})
counter1.update(counter2)
print(counter1)

Counter({'y': 17, 'x': 7, 'x1': 0, 'z': -2})

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 12, 'z': -2, 'x1':0})

counter1['y'] = 20

print(counter1)

Counter({'y': 20, 'x': 5, 'x1': 0, 'z': -2})

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 12, 'z': -2, 'x1':0})
print(counter1['y']) # this will give you the count of element 'y'

12

from collections import Counter
counter1 =  Counter({'x': 5, 'y': 12, 'z': -2, 'x1':0})

print(counter1['y'])

counter1['y'] = 20
counter1['y1'] = 10

print(counter1)

12
Counter({'y': 20, 'y1': 10, 'x': 5, 'x1': 0, 'z': -2})