Python Sort Multidimensional Array Based on 2nd Element of Subarray
list.sort
, sorted
accept optional key
parameter. key
function is used to generate comparison key.
>>> sorted(lst, key=lambda x: x[1], reverse=True)
[['I', 219], ['A', 22], ['P', 14], ['V', 13], ['G', 10], ...]
>>> sorted(lst, key=lambda x: -x[1])
[['I', 219], ['A', 22], ['P', 14], ['V', 13], ['G', 10], ...]
>>> import operator
>>> sorted(lst, key=operator.itemgetter(1), reverse=True)
[['I', 219], ['A', 22], ['P', 14], ['V', 13], ['G', 10], ...]
Use itemgetter
from operator import itemgetter
a = [[1, 3, 5], [2, 511, 7], [17, 233, 1]]
a = sorted(a, key=itemgetter(1))
Output : [[1, 3, 5], [17, 233, 1], [2, 511, 7]]
itemgetter
can also be used to sort by multiple subarrays.