Remove Elements From A Counter

counter에서 요소 삭제하기

Question:

How do you remove an element from a counter?

Answer:

Setting a count to zero does not remove an element from a counter. Use del to remove it entirely.

Source: (example.py)

from collections import Counter
 
c = Counter(x=10, y=7, z=3)
print(c)
 
c['z'] = 0
print(c)
 
del c['z']
print(c)

Output:

$ python example.py
Counter({'x': 10, 'y': 7, 'z': 3})
Counter({'x': 10, 'y': 7, 'z': 0})
Counter({'x': 10, 'y': 7})

How to add or increment single item of the Python Counter class

python 에서  Counter 증가시키명서 리스트 적용하기. 

>>> c = collections.Counter(a=23, b=-9)

#You can add a new element and set its value like this:

>>> c['d'] = 8
>>> c
Counter({'a': 23, 'd': 8, 'b': -9})


#Increment:

>>> c['d'] += 1
>>> c
Counter({'a': 23, 'd': 9, 'b': -9} 


#Note though that c['b'] = 0 does not delete:

>>> c['b'] = 0
>>> c
Counter({'a': 23, 'd': 9, 'b': 0})


#To delete use del:

>>> del c['b']
>>> c
Counter({'a': 23, 'd': 9})
Counter is a dict subclass