I have a list of objects and each object in that list has an attribute that is a date, in the same string format. How do I sort this list of objects by that date?
Sorting a list of objects by date [closed]
5
asked by anonymous 10.10.2016 / 18:43
1 answer
0
You can leave your class comparable to another one using the date attribute.
from functools import total_ordering
from datetime import date
@total_ordering
class obj:
def __init__(self, dia, mes, ano):
self.data = date(ano, mes, dia)
def __eq__(self, other):
return self.data == other.data
def __lt__(self, other):
return self.data < other.data
Or you can use direct by date, it directly accepts comparison.
>>>data1 = date(2012, 12, 1)
>>>data2 = date(1999, 10, 1)
>>>data1 > data2
Since the object can now be compared to another, we can use a sorted, sorted list, n-objects, or any other sort algorithm. Ex:
a = obj(1, 12, 1990)
b = obj(1, 12, 1991)
c = obj(1, 12, 1992)
l = [b, a, c]
r = sorted(l)
print(r[1].data)
18.10.2016 / 00:49