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Print all sublists of a list in Python

  • Difficulty Level : Easy
  • Last Updated : 31 Aug, 2021

Given a list, print all the sublists of a list.
 

Examples: 

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Input  : list = [1, 2, 3] 
Output : [[], [1], [1, 2], [1, 2, 3], [2], 
         [2, 3], [3]]

Input : [1, 2, 3, 4] 
Output : [[], [1], [1, 2], [1, 2, 3], [1, 2, 3, 4], 
         [2], [2, 3], [2, 3, 4], [3], [3, 4], [4]]

 



Approach: 

The approach will be run two nested loops till the length of the given list. The outer loop i traverse from 0 to the length of the list and the inner loop goes from 0 to i. Need to add 1 to length because the range only goes from 0 to i-1. To get the subarray we can use slicing to get the subarray. 

Step 1: Run a loop till length+1 of the given list.
Step 2: Run another loop from 0 to i.
Step 3: Slice the subarray from j to i. 
Step 4: Append it to a another list to store it 
Step 5: Print it at the end

Below is the Python implementation of the above approach:

Python




# Python program to print all
# sublist from a given list
 
# function to generate all the sub lists
def sub_lists (l):
    lists = [[]]
    for i in range(len(l) + 1):
        for j in range(i):
            lists.append(l[j: i])
    return lists
 
# driver code
l1 = [1, 2, 3]
print(sub_lists(l1))

Output: 

[[], [1], [2], [1, 2], [3], [2, 3], [1, 2, 3]]
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