Python | Print all sublists of a list

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

Examples:

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:
Approach will be run two nested loop till the length of the given list. The outer loop picks starting element and inner loop considers all elements on right of the picked elements as ending element of subarray. To get the subarray we can use slicing to get the subarray.

Step 1: Run a loop till length of the given list.
Step 2: Run a loop from i+1 to length of the list to get all the subarrays from i to its right.
Step 3: Slice the subarray from i to j.
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:

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# Python program to print all 
# sublist from a given list 
  
# function to generate all the sub lists
def sub_lists(list1):
  
    # store all the sublists 
    sublist = [[]]
      
    # first loop 
    for i in range(len(list1) + 1):
          
        # second loop 
        for j in range(i + 1, len(list1) + 1):
              
            # slice the subarray 
            sub = list1[i:j]
            sublist.append(sub)
              
      
    return sublist
  
# driver code
l1 = [1, 2, 3, 4]
print(sub_lists(l1))

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Output:

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


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