Today I learned you can use the plus (+) operator to concatenate or extend lists in Python.
Say you have two lists.
list_a = [1, 2, 3] list_b = ['Nono', 'MA']
And that you want to create a continuous list with the contents of both, which would look something like
[1, 2, 3, 'Nono', 'MA'].
You can simple add both lists to obtain that result.
>>> combined_list = [1, 2, 3] + ['Nono', 'MA'] >>> combined_list [1, 2, 3, 'Nono', 'MA']
Of course, it doesn't too much sense in this example because we're explicitly defining the lists and we could define a combined list directly.
combined_list = [1, 2, 3, 'Nono', 'MA']
But it can be useful when we actually need to add lists, for instance to concatenate the results of
glob file listing operations.
>>> from glob import glob >>> files_a = glob('a/*') >>> files_a ['a/file.txt', 'a/image.jpg'] >>> files_b = glob('b/*') >>> files_b ['b/data.json', 'b/profile.jpeg'] >>> all_files = files_a + files_b >>> all_files ['a/file.txt', 'a/image.jpg', 'b/data.json', 'b/profile.jpeg']