Python sort list of list containing integer and string with integers inside

Question

How i can use python to sort the list format

format=[\"12 sheet\",\"4 sheet\",\"48 sheet\",\"6 sheet\", \"busrear\", \"phonebox\",\"train\"]

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Answer 1

The same solution can be used here

print sorted(format_data, key=lambda x: (int(x[1].split(None, 1)[0]) if x[1][:1].isdigit() else 999, x))

Note the x[1] instead of just x. x[1] means the second element in x.

Result:

[[2, '4 sheet', 0],
 [4, '6 sheet', 0],
 [1, '12 sheet', 0],
 [3, '48 sheet', 0],
 [5, 'Busrear', 0],
 [6, 'phonebox', 0],
 [7, 'train', 0]]

Answer 2

You can do this:

lst = [[1L, u'12 sheet', 0],
       [2L, u'4 sheet', 0],
       [3L, u'48 sheet', 0],
       [4L, u'6 sheet', 0],
       [5L, u'Busrear', 0],
       [6L, u'phonebox', 0],
       [7L, u'train', 0]]

def sortby(x):
    try:
        return int(x[1].split(' ')[0])
    except ValueError:
        return float('inf')

lst.sort(key=sortby)
print lst

Output:

[[2L, u'4 sheet', 0], [4L, u'6 sheet', 0], [1L, u'12 sheet', 0], [3L, u'48 sheet', 0], [5L, u'Busrear', 0], [6L, u'phonebox', 0], [7L, u'train', 0]]

You can always use fancier list comprehension but readability counts. Which is why you might not feel like modifying the cool solution by falsetru for this slightly changed task.

Answer 3

a = [5,1,"a","A",2]
a = list(map(int,filter(lambda x:x.isdigit(),sorted(map(str,a)))))+list(filter(lambda x:x.isalpha(),sorted(map(str,a))))
print(a)

Answer 4

You can trivially sort a list of strings with built-in sorted method. Even if the objects in your list are more complex, you can still use sorted. Just pass a custom key parameter to use the second item from the inner list as the key in ordering comparisons:

result = sorted(format, key=lambda x: x[1])

Finally switch to your sorting function natsorted (from natsort package) and you end up with the desired, naturally sorted, result list:

from natsort import natsorted
result = natsorted(format, key=lambda x: x[1])

Answer 5

you can use sorted or list.sort

>>> format.sort(key=lambda x: (x[1]))
[[1L, u'12 sheet', 0], [2L, u'4 sheet', 0], [3L, u'48 sheet', 0], [4L, u'6 sheet', 0], [5L, u'Busrear', 0], [6L, u'phonebox', 0], [7L, u'train', 0]]