Is it possible to split and put the rest to list?

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I'm trying to process a line like this

item1 item2 item3 item4_1 item4_2 item4_3 ...

And the code is like this

data = '''item1 item2 item3 item4_1 item4_2 item4_3'''
for row in data.split("\n"):
    (item1, item2, item3, item4_list) = row.split(' ')

It looks like python can't unpack the rest of the items to a list, any ideas?

If you use two steps, and maxsplit for str.split() this can be python 2 or 3 like:

data = '''item1 item2 item3 item4_1 item4_2 item4_3'''
for row in data.split("\n"):
    item1, item2, item3, item4_list = row.split(' ', 3)
    item4_list = item4_list.split(' ')
    print(item1, item2, item3, item4_list)
item1 item2 item3 ['item4_1', 'item4_2', 'item4_3']

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As suggested by student, you want to use extended unpacking syntax—that is, you can put *rest directly in the target list (the same way you use *args in a function definition), and it will soak up the rest of the values:

item1, item2, item3, *item4_list = row.split(' ')

If you need something that works in Python 2, there isn’t anything as nice. (They wouldn’t have added extended unpacking if there were already a way to do it that’s just as nice…) The simplest solution here is probably to do it in two steps, using the max-splits argument to split:

item1, item2, item3, rest = row.split(' ', 3)
item4_list = rest.split(' ')

Split a list into two halves in Java, Given a list, we need to split into two news lists in Java. Method 1 (Naive) First create two new empty lists and assign first half element of original list and rest into second empty list. create new list and insert valuese which is returne by. // list  The SPLIT_TABLE_SUBPARTITION clause is extended similarly to allow split of a range or list subpartition into N new subpartitions. The behavior of the SQL statement with respect to local and global indexes remains unchanged. Corresponding local index partition are split into multiple partitions.

For Python3, may be you can try (As Brad Solomon mentioned link for Extended Iterable Unpacking in comments above):

(item1, item2, item3, *item4_list) = row.split(' ')

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Partition a List in Java, In this tutorial I will illustrate how to split a List into several sublists of a given size. Partitioning a Collection is also possible with Guava: ? Split an array into two equal Sum subarrays Given an array of integers greater than zero, find if it is possible to split it in two subarrays (without reordering the elements), such that the sum of the two subarrays is the same.

Data.List.Split, Safe Haskell, Safe List.Split module contains a wide range of strategies for splitting lists with respect to some sort of Typically chop is called with some function that will consume an initial prefix of the list and produce a value and the rest of the list. Divides up an input list into a set of sublists, according to n and m input  You can take the text in one or more cells, and split it into multiple cells using the Convert Text to Columns Wizard. Select the cell or column that contains the text you want to split. Select Data > Text to Columns. In the Convert Text to Columns Wizard, select Delimited > Next. Select the Delimiters for your data.

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  • How about (item1, item2, item3, *item4_list) = row.split(' ')
  • @student invalid syntax for both python2 and python3?
  • Not sure but for above code it worked fine.
  • Python 3 only I think, introduced in extended iterable unpacking