python for interview Cheat Sheet

Priority Queue	from queue import PriorityQueue
	customers = PriorityQueue()
	customers.put((2, "Harry"))
	while customers:
	print(customers.get())

import 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

deque sized

window = deque(maxlen=3)

Split	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: ...

array 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)

create 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

initialise	__init__(self, var1, var2)
create iterable	__iter__(self)

Read file	wfile = open(wordFile, ' r')
split line	for line in wfile: word = line[:-1]

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python for interview Cheat Sheet by faq