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Python | Shift sublist in list
• Last Updated : 27 Aug, 2019

Sometimes, while working with list, we can have a problem in which we need to shift some sublist to desired index in same sublist. This problem can occur in day-day programming. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using `insert() + pop()` + loop
The combination of above functions can be used to perform the particular task. The` pop` function can be used to remove the sublist and `insert` function inserts the sublist. This happens for each element in single iteration in loop.

 `# Python3 code to demonstrate working of``# Shift sublist in list``# Using insert() + pop() + loop`` ` `# function to perform the task ``def` `shift_sublist(test_list, strt_idx, no_ele, shft_idx):``    ``for` `ele ``in` `range``(no_ele):``        ``test_list.insert(shft_idx ``+` `1``, test_list.pop(strt_idx))``    ``return` `test_list`` ` `# initializing list``test_list ``=` `[``4``, ``5``, ``6``, ``7``, ``3``, ``8``, ``10``, ``1``, ``12``, ``15``, ``16``]`` ` `# printing original list``print``(``"The original list is : "` `+`  `str``(test_list))`` ` `# Using insert() + pop() + loop``# Shift sublist in list``res ``=` `shift_sublist(test_list, ``2``, ``3``, ``6``)`` ` `# Printing result``print``(``"The list after shift of sublist : "` `+`  `str``(res))`
Output :

The original list is : [4, 5, 6, 7, 3, 8, 10, 1, 12, 15, 16]
The list after shift of sublist : [4, 5, 8, 10, 1, 6, 7, 3, 12, 15, 16]

Method #2 : Using list slicing
This task can also be using list slicing technique in which one can just add the different sections of list at required positions.

 `# Python3 code to demonstrate working of``# Shift sublist in list``# Using list slicing`` ` `# function to perform the task ``def` `shift_sublist(test_list, strt_idx, no_ele, shft_idx):``    ``return` `(test_list[:strt_idx] ``+` `test_list[strt_idx ``+` `no_ele : no_ele ``+` `shft_idx ``-` `1``]``            ``+` `test_list[strt_idx : strt_idx ``+` `no_ele] ``+` `test_list[shft_idx ``+` `no_ele ``-``1``:])`` ` `# initializing list``test_list ``=` `[``4``, ``5``, ``6``, ``7``, ``3``, ``8``, ``10``, ``1``, ``12``, ``15``, ``16``]`` ` `# printing original list``print``(``"The original list is : "` `+`  `str``(test_list))`` ` `# Using list slicing``# Shift sublist in list``res ``=` `shift_sublist(test_list, ``2``, ``3``, ``6``)`` ` `# Printing result``print``(``"The list after shift of sublist : "` `+`  `str``(res))`
Output :
```The original list is : [4, 5, 6, 7, 3, 8, 10, 1, 12, 15, 16]
The list after shift of sublist : [4, 5, 8, 10, 1, 6, 7, 3, 12, 15, 16]
```

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