What is the syntax to insert one list into another list in python

Question

Given two lists   x    1 2 3  y    4 5 6    What is the syntax to    Insert x into y such that y now looks like  1  2  3   4  5  6    Insert all the items of x into y such that y now looks like  1  2  3  4  5  6

User · Answer

If you want to add the elements in a list (list2) to the end of other list (list), then you can use the list extend method

list = [1, 2, 3]
list2 = [4, 5, 6]
list.extend(list2)
print list
[1, 2, 3, 4, 5, 6]

Or if you want to concatenate two list then you can use + sign

list3 = list + list2
print list3
[1, 2, 3, 4, 5, 6]

User · Answer

Do you mean append    gt  gt  gt  x    1 2 3   gt  gt  gt  y    4 5 6   gt  gt  gt  x append y   gt  gt  gt  x  1  2  3   4  5  6     Or merge    gt  gt  gt  x    1 2 3   gt  gt  gt  y    4 5 6   gt  gt  gt  x   y  1  2  3  4  5  6   gt  gt  gt  x extend y   gt  gt  gt  x  1  2  3  4  5  6

User · Answer

You can also just do     x    y

User · Answer

The question does not make clear what exactly you want to achieve   List has the append method  which appends its argument to the list    gt  gt  gt  list one    1 2 3   gt  gt  gt  list two    4 5 6   gt  gt  gt  list one append list two   gt  gt  gt  list one  1  2  3   4  5  6     There s also the extend method  which appends items from the list you pass as an argument    gt  gt  gt  list one    1 2 3   gt  gt  gt  list two    4 5 6   gt  gt  gt  list one extend list two   gt  gt  gt  list one  1  2  3  4  5  6    And of course  there s the insert method which acts similarly to append but allows you to specify the insertion point    gt  gt  gt  list one insert 2  list two   gt  gt  gt  list one  1  2   4  5  6   3  4  5  6    To extend a list at a specific insertion point you can use list slicing  thanks   florisla     gt  gt  gt  l    1  2  3  4  5   gt  gt  gt  l 2 2      a    b    c    gt  gt  gt  l  1  2   a    b    c   3  4  5    List slicing is quite flexible as it allows to replace a range of entries in a list with a range of entries from another list    gt  gt  gt  l    1  2  3  4  5   gt  gt  gt  l 2 4      a    b    c   1 3   gt  gt  gt  l  1  2   b    c   5

User · Answer

If we just do x append y   y gets referenced into x such that any changes made to y will affect appended x as well  So if we need to insert only elements  we should do following   x    1 2 3  y    4 5 6  x append y

User · Answer

foo    1  2  3  bar    4  5  6   foo append bar  -- gt   1  2  3   4  5  6   foo extend bar  -- gt   1  2  3  4  5  6    http   docs python org tutorial datastructures html

[python] What is the syntax to insert one list into another list in python?

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