Nested lambda statements when sorting lists

Question

I wish to sort the below list first by the number, then by the text.

lst = [\'b-3\', \'a-2\', \'c-4\', \'d-2\']

# result:
# [\'a-2\', \'d-2\', \'b-3\', \'c-         


        

Answer 1

lst = ['b-3', 'a-2', 'c-4', 'd-2']
res = sorted(lst, key=lambda x: tuple(f(a) for f, a in zip((int, str), reversed(x.split('-')))))
print(res)

['a-2', 'd-2', 'b-3', 'c-4']

Answer 2

We can wrap the list returned by split('-') under another list and then we can use a loop to handle it:

# Using list-comprehension
>>> sorted(lst, key=lambda x: [(int(num), text) for text, num in [x.split('-')]])
['a-2', 'd-2', 'b-3', 'c-4']
# Using next()
>>> sorted(lst, key=lambda x: next((int(num), text) for text, num in [x.split('-')]))
['a-2', 'd-2', 'b-3', 'c-4']