In this program, you will learn to check if the Python list contains all the items of another list and display the result using python print() function. >>> a=[] # Empty lists evaluate to False >>> if not a: print ("list is empty") else: print ("list is not empty") Python in and not in operators work fine for lists, tuples, sets, and dicts (check keys). Check if element exist in list based on custom logic. Depending on the needs of our data analysis we may need to check for presence of sequential numbers in a python data container. The first list is : [1, 2, 4, 3, 5] The second list is : [1, 2, 4, 3, 5] The lists are identical Method 3 : Using sum() + zip() + len() Using sum() + zip(), we can get sum of one of the list as summation of 1 if both the index in two lists have equal elements, and then compare that number with size of other list.This also requires first to check if two lists are equal before this computation. Let’s use it to check if any string element in list is of length 5 i.e. Python all() method to check if the list exists in another list. In this article we will find out if the elements present in the list are in a strictly … If we express the first term as a and the difference between the terms d, then we can generalize any arithmetic progressive series as [a, a+d, a+2d, a+3d …,a+kd]. Hence following conditional statement can be used to check if list is empty. With range and sorted. Using a loop, in every iteration, we check if start element is a successor of prev or not. In the below programs we find out if among the elements of Alist, there are any consecutive numbers. Python Lists The list is a most versatile data type in Python. In this case, the sequence should also be a parameter of the function, giving the signature: def has_sequence(array, sequence): Next, I would rely on Python iterations to "check" if array is a list… A variable ‘prev’ is used for keeping the record of previous integer and start is used for getting the starting position of the increasing sequence. To be more precise: A list in Python is an ordered group of items or elements. In Python, empty list object evaluates to false. Furthermore, lists can grow in a program run, while in C the size of an array has to be fixed at compile time. Python any() function checks if any Element of given Iterable is True. The sorted function will rearrange the elements of the list in a sorted order. Python : Convert list of lists or nested list to flat list; Python: Check if a list is empty or not - ( Updated 2020 ) Python : How to Merge / Join two or more lists; Python: Reverse a list, sub list or list of list | In place or Copy; Python: Check if all values are same in a Numpy Array (both 1D and 2D) Generally speaking a list is a collection of objects. For example, not all the items in a list need to have the same type. It can be written as a list of comma-separated items (values) between square brackets. Lists are related to arrays of programming languages like C, C++ or Java, but Python lists are by far more flexible than "classical" arrays. This approach uses another list ‘res’ and an iterable ‘it’. Given a list, we may need to check for the sequence of its elements. 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