Python’s list() with examples

In this article, we will discuss yet another python method which is also a Python Constructor, list(). list() is one of the most used built-in python methods. Today, we will see the syntax of list(), the parameters it takes, the value it returns and most importantly what it does, after that some examples to concrete…

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Product of two numbers using Recursion

Problem Statement: Given two integers, find their product using recursion. Note: Numbers can be both negative and positive. Example: Input: a = 5 , b = 24 Output: product = 120 Input : a = 11, b = 12 Output : 132 Input : a = -2, b = 12 Output : -24 Solution: Table…

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Sum of the series 1^1 + 2^2 + 3^3 + 4^4+ 5^5 + … n^n using recursion

Problem Statement: Given an integer n, find the sum of the series 1^1 + 2^2 + 3^3 + 4^4+ 5^5 + … n^n using recursion. Example: Input: n = 5 Output = 3413 Explanation: 1^1 + 2^2 + 3^3 + 4^4 + 5^5 = 3413 Input: n = 7 Output = 873612 Explanation: 1^1 +…

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Sum of digits of a number using Recursion

Problem Statement: Given a non-negative integer {0,1,2….}, find the sum of all its digit using recursion. Example: Input: 21212 Output:8 Input: 993311 Output: 26 Input: 12131 Output:8 In this article, we will see how we can find the sum of digits of a number using recursion. The most important prerequisite for recursion is – the…

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Python’s built-in divmod() with examples

Python has many built-in functions. In this article, we will talk about one such function and that function is divmod(). We will talk about its syntax, where is it used, what parameters it takes and what value it returns. After the discussion, we will see some examples for better understanding. Table of Contents Overviewdivmod() – Syntax,…

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Python’s set() function with examples

Table of Contents Overviewset() – Syntax, Parameters and Return Value.Examples – set() with string, tuple, list, buffer and dictionaryExamples – set() with an iterator objectSuggested Reading Set in mathematics is a well-defined collection of distinct objects which are often called as elements or the members. There’s a dedicated datastructure for sets in almost every advanced…

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How to print to stderr in Python?

Table of Contents OverviewBasics – Brief discussion on stderr and stdoutImplementationFlowchart of the process print() is a built-in method in python which by default writes to the python’s stdout file object. However, we can redefine the print() function to redirect the output to stderr rather than stdout. print() has a kwarg called file where we…

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Python’s built-in print() function with examples

Table of Contents Overviewprint() – Syntax, Parameters and Return ValueExamples using print()print() with no argumentsprinting to standard outputprint() with no argumentprint() with a string, tuple, dictionary, list and setprint() with multiple argumentsprint() with sep argumentprint() with end argumentPrinting to a text streamprinting to stderrprinting to a custom fileSuggested Reading Almost everyone starts their Python journey…

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Python’s isdisjoint() method with examples

Python has many built-in methods which are made to ease several common tasks, one such method is isjoint(). It is a set based built-in function, which means it is only applicable to the set data structure. Table of Contents Overviewisdisjoint() – Syntax, Parameters and Return ValueExamples using isdisjoint()isdisjoint() with str, list, tuples and setisdisjoint() with…

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Python’s isdisjoint() method time complexity (set intersection)

We already discussed isdisjoint() in great detail here. This tutorial will only focus on the runtime complexity of the function as programmers tend to get confused about the runtime complexity a lot. Let’s quickly recall what isdisjoint() function is, and what it does. isjoint() When applied to a set x, it returns true if no element from set x is…

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Different ways to iterate/loop over a dictionary in Python

Table of Contents Overview – What is a dictionary?Iterating through the keysMethod 1 – Using in keywordMethod 2 – Using dict.keys()Iterating through the valuesUsing dict.values()Iterating through the key-value pairsUsing dict.items()Additional infoSuggested Reading What is a dictionary in Python? A dictionary is a collection which is unordered, mutable and indexed. Mutable here means the values can…

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std :: all_of() in C++

Table of Contents Overview std::all_of() – Syntax, Parameters and Return ValueExamples using std::all_of()Example 1 – using an array of integers with std::all_of()Example 2 – using a string with std::all_of()Time Complexity discussion std::all_of() is a built-in function under header . all_of() This C++ method returns true if all the elements in the range satisfies a certain…

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Time complexity analysis of std::all_of() in C++

We have already discussed about std::all_of() in great detail here. This tutorial explicitly focuses on the runtime cost of the function. Before moving forward let’s briefly recall what std::all_of() is, and what it does. std::all_of() is a built-in C++ function under header which returns true if all the elements in a range[start,end) satisfy a…

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std::any_of() in C++

Table of Contents Overviewstd::any_of() – Syntax, Parameters and Return ValueExamples using std::any_of()Example 1 – using an array of integers with std::any_of()Example 2 – using a string with std::any_of()Time Complexity discussionSuggested Reading std::any_of() is a built-in function under the header . any_of() This C++ method returns true if any element in the range[start,end) satisfy a certain condition(a predicate). A predicate is a function which takes…

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Time complexity analysis of std::any_of() in C++

We have already discussed about std::any_of() in great detail here. This tutorial explicitly focuses on the runtime cost of the function. Before moving forward let’s briefly recall what std::any_of() is, and what it does. std::any_of() is a built-in C++ function under the header  which returns true if any elements in the range[start,end) satisfy a certain condition(a predicate). A predicate is a function which takes argument(s), and…

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std::none_of() in C++

Table of Contents Overviewstd::none_of() – Syntax, Parameters and Return ValueExamples using std::none_of()Example 1 – using an array of integers with std::none_of()Example 2 – using a string with std::none_of()Time Complexity discussionSuggested Reading std::none_of() is a built-in function under the header . none_of() This C++ method returns true if all the elements in the range[start, end) returns false for a certain condition(a predicate).…

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Python’s len() on a dictionary

len() is a built-in function in python which returns the number of items in an object. It can be used with a sequence(list, tuple, string etc) or a collection (like dictionary, set etc). However, this tutorial shall only focus its use with a dictionary. For complete tutorial on built-in len(), visit: Python’s built-in len() method…

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Python’s list() method on a dictionary

list() is a built-in python method, and also a constructor. When an iterable is passed to the method, it converts the iterable to a list. This tutorial will only focus on the use of list() function with a dictionary. For a detailed tutorial on the function list(), visit: Python’s list() with examples ( A detailed…

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dictionary[‘key’]: Fetching the value for a particular key in a dictionary in Python

A dictionary is basically a set of key:value pairs with a condition that no two keys are the same. Each key-value pair in the dictionary is separated by a comma.  Let’s see an example of a dictionary in python, dictionary = {'apple': 2,'banana' : 5, 'carrot' : 4} Here, apple, banana and carrot are the keys; while…

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del d[key]: Removing the key from Python dictionary

This tutorial only focuses on the use of del keyword to delete the key from a dictionary. There are other ways too which we shall discuss in a seperate post. del is a keyword in Python which is used to delete the Objects. Since everything in Python is Object, it can be used to delete the…

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Check if a given key already exists in a Python dictionary (4 ways)

Table of Contents OverviewMethod 1 – Using in keywordMethod 2 – Finding the key in dict.keys()Method 3 – Using try and except block to check if the key is present in the dictionary or not.Method 4 – Iterating over dict.items() and finding the key existenceWhich is the fastest way to find key among all? What…

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