Python program to print all sublists of a list.

Printing sublists in Python

The sublist is a portion of the list that contains one or more elements from the original list. These sublists can be contiguous(elements appear in the same order) or non-contiguous(where elements are taken from different positions).

Example: Printing all Contiguous Sublists

Let's look at the following example, where we are going to print all the contiguous sublists of the given list using nested loops.

def demo(a):
   for i in range(len(a)):
      for j in range(i, len(a)):
            print(a[i:j+1])
x = [11,2,3]
demo(x)

The output of the above program is as follows -

[11]
[11, 2]
[11, 2, 3]
[2]
[2, 3]
[3]

Example: Printing all non-contiguous sublists

In the following example, we are going to print all the non-contiguous sublists of the given list.

from itertools import combinations
def demo(x):
    for r in range(1, len(x) + 1):
        for a in combinations(x, r):
            print(list(a))
demo([11,3,22])

The output of the above program is as follows -

[11]
[3]
[22]
[11, 3]
[11, 22]
[3, 22]
[11, 3, 22]

Printing sublists using List Comprehension

The python List comprehension offers a simple way to create a list using a single line of code. It combines loops and conditional statements. 

Following is the syntax of Python list comprehension -

newlist = [expression for item in iterable if condition == True]

Example

Consider the following example, where we are going to print all the contiguous sublists using the list comprehension.

def demo(a):
    return [a[i:j+1] for i in range(len(a)) for j in range(i, len(a))]
print(demo(['a', 'b', 'c']))

The output of the above program is as follows -

[['a'], ['a', 'b'], ['a', 'b', 'c'], ['b'], ['b', 'c'], ['c']]