1
Like, I have a list like this:
lista = [1,1,2,3,3,3]
And I want to order her to stay
lista = [3,3,3,1,1,2]
That is, the most occurring values would be at the beginning of the list, while the least occurring values at the end. I’ve tried several functions, but it didn’t work.
0
If you don’t want to use libraries, here’s an idea using dictionaries:
First I create a dictionary with occurrences
lista = [1,1,2,3,3,3]
ocorrencias = {}
for numero in lista:
if numero in ocorrencias: #Se o numero ja esta no dicionario
ocorrencias[numero] += 1
else: #Se não está, adiciono em ocorrencias
ocorrencias[numero] = 1
#OU ocorrencias.update({numero:1})
>>> print ocorrencias
{1: 2, 2: 1, 3: 3}
Then create the sorted list from the occurrences dictionary
def pega_maior_ocorrencia(dicionario):
maior_ocorrencia = 0
chave = None
for key, value in dicionario.iteritems(): #Python2.X
#for key, value in d.items(): #Python3.X
if value > maior_ocorrencia:
maior_ocorrencia = value
chave = key
del dicionario[chave] #deleta do dict mesmo dentro da função
return [chave]*maior_ocorrencia
lista_ocorrencias = []
for i in range(len(ocorrencias)):
lista_ocorrencias += pega_maior_ocorrencia(ocorrencias)
>>> print lista_ocorrencias
[3, 3, 3, 1, 1, 2]
-2
Try this way:
from collections import Counter
lista = [1,1,2,3,3,3]
print [item for items, c in Counter(lista).most_common() for item in [items] * c]
# [3, 3, 3, 1, 1, 2]
Could you explain your answer ?
This "for items, c in Counter(list). most_common()" returns the values of your list and the amount of times it repeats, the rest tries to fill this list with * c or value x the amount of times the value repeats in your list. Go apologizing for the hasty explanation, but I’m leaving here. If you don’t solve it this way warn the error that I can help you once I return.
Edith your answer and put your explanation in it. You have not tested this code to say "If not resolved..." ?
It worked super well Raphael! Thank you very much friend, it served too much! Still did not know this library Counter. Thankful for the help!
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The list goes like this: list = [1,1,2,3,3,3] and I want it to be ordered by amount of occurrence, then it would be: list = [3,3,3,1,1,2]. I have no idea how to do this
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