Problem Formulation: Given a list of elements in Python. How to get the number of elements in the list? Examples: List Number of Elements [3, 42, 2] 3 [] 0 [‘Alice’, ‘Bob’, ‘Carl’] 3 [(1, 2), [3, 4]] 2 Method 1: len() The most Pythonic way to get the number of list elements is Python’s … Read more
Summary: This blog explores the steps to sort elements of a Set. Python offers the built-in sorted() function to sort elements in container objects such as a set or a list. For example: sorted({1, 5, 2}) sorts the elements in the set and returns the sorted list [1, 2, 5]. Note: All the solutions provided … Read more
Being hated by newbies, experienced Python coders can’t live without this awesome Python feature. In this article, I give you everything you need to know about set comprehensions using the bracket notation {}. What is Set Comprehension? Set comprehension is a concise way of creating sets in Python using the curly braces notation {expression for … Read more
In this article, you’ll learn how to divide a list into equally-sized chunks in Python. Step-by-step, you’ll arrive at the following code to chunk your list into evenly-sized parts: Go ahead and play around with the code yourself but if you need some explanations, read on because I’ll explain it to you in much detail: … Read more
[toc] Summary: The following methods allow us to check if all elements in a list are identical or not: Using list.count() Compare The Elements Using a For Loop Using The all() Method Using The set() Method Using Another List Slice And Compare Problem: Given a list; how will you identify if all elements within the … Read more
Believe it or not—how you answer this question in your day-to-day code reveals your true Python skill level to every master coder who reads your code. Beginner coders check if a list a is empty using crude statements like len(a)==0 or a==[]. While those solve the problem—they check if a list is empty—they are not … Read more
Method 1: Iterating over Consecutive (Sliding) Windows Given are: Python list lst Window size n Problem Formulation: How to loop through the list in consecutive element-windows of size n, so that in each iteration, you can access the n next elements in the list? # INPUT: lst = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’] … Read more
✯ Overview Problem: Fixing TypeError: list indices must be integers or slices, not str in Python. Example: The following code lists a certain number of transactions entered by the user. Output: Solution: Please go through this solution only after you have gone through the scenarios mentioned below. Bugs like these can be really frustrating! ? But, … Read more
Problem Formulation Given an integer number n. Given an initial string value s. How to create an array of n copies of s in Python? # Input: n = 5 s = ” # Output: [”, ”, ”, ”, ”] Method 1: List Multiplication Python doesn’t have a built-in array type. The equivalent of an … Read more
Problem Formulation: Replacing One Element Given List lst Element x Index i How to replace the element at index i in the list lst with the new element x? Solution Indexing You use simple indexing using the square bracket notation lst[i] = x to replace the element at index i in list lst with the … Read more
Python’s built-in iter() function returns an iterator for the given object. For example, iter([1, 2, 3]) creates an iterator for the list [1, 2, 3]. You can then iterate over all elements in the iterator, one element at a time, in a for or while loop such as: for x in iter([1, 2, 3]). Basic … Read more
Python’s built-in slice() function returns a new slice object you can use to slice over sequences such as lists, strings, or tuples. Read more about lists in our full tutorial about Python Slicing. Example 1: Slice with Stop Argument One of the best way to learn is by example! Here are some examples of how … Read more