将列表转换为列表的元组

Question

I have a numpy ndarray which needs to be converted to a tuple of lists for multiprocessor.Pool to operate on them. I have converted this ndarray to a list shown here:

file_list = ['File_01', 'File_02', 'File_03']

In order to feed this list of files as an argument I believe I need this list to be a tuple of lists shown here:

tuple_of_file_names = (['File_01'], ['File_02'], ['File_03'])

I am interested in how to convert this list of file names to a tuple of lists of file names.

Answer 1

Well if you originally had an ndarray , the simplest thing you can do is add another axis to it using np.newaxis / None and then obtain a nested list using tolist() .

Here's an example:

x = np.array([1,2,3])

x[:, np.newaxis].tolist()
# [[1], [2], [3]]

---

Note: If you want the resulting list as a tuple simply call the tuple constructor, as tuple(nested_list)

Answer 2

简单的理解就能胜任：

tuple_of_file_names = tuple([name] for name in file_list)

Answer 3

Use map + lambda and tuple() to convert to tuple:

file_list = ['File_01', 'File_02', 'File_03']

tuple_of_file_names = tuple(map(lambda x: [x], file_list))
# (['File_01'], ['File_02'], ['File_03'])

Answer 4

You can use map along with zip and tuple to get your result:

file_list = ['File_01', 'File_02', 'File_03']
file_list = tuple(map(list,zip(file_list)))
print(file_list)

Output:

(['File_01'], ['File_02'], ['File_03'])