Python: Check whether a list contains a sublist

Last update on May 28 2022 13:14:45 (UTC/GMT +8 hours)

Python List: Exercise - 32 with Solution

Write a Python program to check whether a list contains a sublist.

Python: Check whether a list contains a sublist

Sample Solution:-

Python Code:

def is_Sublist(l, s):
	sub_set = False
	if s == []:
		sub_set = True
	elif s == l:
		sub_set = True
	elif len(s) > len(l):
		sub_set = False

	else:
		for i in range(len(l)):
			if l[i] == s[0]:
				n = 1
				while (n < len(s)) and (l[i+n] == s[n]):
					n += 1
				
				if n == len(s):
					sub_set = True

	return sub_set

a = [2,4,3,5,7]
b = [4,3]
c = [3,7]
print(is_Sublist(a, b))
print(is_Sublist(a, c))

Sample Output:

True                                                                                                          
False

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Previous: Write a Python program to count the number of elements in a list within a specified range.
Next: Write a Python program to generate all sublists of a list.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

The os and os.path modules.
The __file__ constant
os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
os.path.dirname(path) (returns "the directory name of pathname path")
os.getcwd() (returns "a string representing the current working directory")
os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m