追加到另一个数组python中的数组

Question

Basically I have data that spans several years and I would like to append all this data into an array using one array and the years as keys. Then would would like to callback all the data in the array relevant to a particular year by just calling the date.

for example:

all data that is relevant to 2016 would be as such

array[2016].append('1')
array[2016].append('2')

and then when the date changes to 2015

array[2015].append('3')
array[2015].append('4')

and then call the data

print array[2016]
1,2

Answer 1

How about python dictionaries:

>>> from collections import defaultdict
>>> data = defaultdict(list)
>>> data[2016].append('1')
>>> data[2016].append('2')
>>> data[2015].append('3')
>>> data[2015].append('4')
>>> print data[2016]
['1', '2']
>>> print data[2015]
['3', '4']