“Python Deque” Kod odpowiedzi

Python Deque

# deque -list-like container with fast appends and pops on either end
from collections import deque

queue = deque() # create deque
queue.append(2) # append right
queue.appenleft(1) # append left
queue.clear() # remove all elements --> len = 0
copy_queue = queue.copy() # create a shallow copy of the deque
queue.count(x) # count the number of deque elements equal to x
queue.extend([4, 5, 6]) # extend right by an iterable
queue.extendleft([1, 2, 3]) # extend left by an iterable

# More at: https://docs.python.org/3/library/collections.html#collections.deque
Lovely Lark

Python uporządkowany

>>> # regular unsorted dictionary
>>> d = {'banana': 3, 'apple': 4, 'pear': 1, 'orange': 2}

>>> # dictionary sorted by key
>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])

>>> # dictionary sorted by value
>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])

>>> # dictionary sorted by length of the key string
>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])
rebellion

Counter Most_Common

most_common([n])¶
Return a list of the n most common elements and their counts from the most common to the least. If n is omitted or None, most_common() returns all elements in the counter.
Elements with equal counts are ordered arbitrarily:

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

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
Foolish Flamingo

Deque Python

# deque -list-like container with fast appends and pops on either end
from collections import deque

queue = deque() # create deque
queue.append(2) # append right
queue.appenleft(1) # append left
queue.clear() # remove all elements --> len = 0
copy_queue = queue.copy() # create a shallow copy of the deque
queue.count(x) # count the number of deque elements equal to x
queue.extend([4, 5, 6]) # extend right by an iterable
queue.extendleft([1, 2, 3]) # extend left by an iterable
Fierce Flamingo

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