QueuesPriority Queue | from queue import PriorityQueue | | | customers = PriorityQueue() | | | customers.put((2, "Harry")) | | | while customers: | | | print(customers.get()) |
Heapsimport heapq | heapq.heapify(li) | transform array "li" into min-heap | heapq._heapify_max(li) | transform array "li" into max-heap | heapq.heappush(li,4) | push element in the heap | heapq.heappop(li) | pop the smallest element | heapq.nlargest(3, li1) | get the 3 largest numbers | heapq.nsmallest(3, li1) | get the 3 smallest numbers | heapq.nsmallest(3, tuple_list, key=lambda x: x[1]) | if we want 3 smallest tuple_list second dimension |
Dequedeque sized | window = deque(maxlen=3) |
| | StringSplit | string.split(" ", 1) //split first occ | Replace | str.replace('e', '') | Replace first occurrence | str.replace('e', '',1) | Remove symbols from phrase | paragraph = ''.join([c.lower() if c.isalnum() else ' ' for c in paragraph]) | check array if matches | banned_words = set(banned)
for word in toCount:
if word not in banned_words:
... |
Arraysarray of set capacity | LRUcache = [] * capacity | sort to new | new_list = sorted(old_list, key=..., reverse=...) | sort in place | list.sort(key=..., reverse=...) | sort by len | list.sort(key=len) | sort column | def takeSecond(elem):
return elem[1]
list.sort(key=takeSecond) |
| | Dictcreate dict | dict = {} | return keys arr | dict.keys() | return values arr | dict.values() | order a dict by value | from operator import itemgetter
sorted_keys = sorted(toReduce.items(), key=itemgetter(1)) | orderdict | from collections import OrderedDict
d = OrderedDict()
d.move_to_end('key') | orderdict by value | from collections import OrderedDict
from operator import itemgetter
OrderedDict(sorted(d.items(), key = itemgetter(1), reverse = True)) | put in first position | d.move_to_end('key',last=False) | comprehension list val*2 | dict_variable = {key:value*2 for (key,value) in dictonary.items()} | dict with array as key | dictionary[tuple(arr)] = val |
Classesinitialise | __init__(self, var1, var2) | create iterable | __iter__(self) |
FilesRead file | wfile = open(wordFile, ' r') | split line | for line in wfile:
word = line[:-1] |
|
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