Reading CSV file in Numpy

Overview Pandas provide a nice way to read the content of a CSV file into a dataframe using its pandas.read_csv() function, however, there is a need sometimes to read the content of a CSV file into numpy arrays. In this tutorial, we will try to cover every method which can be used to read the…

https://thecodingbot.com/reading-csv-file-in-numpy/

Convert a Python list to a Pandas Dataframe

Overview Problem Statement: Given a Python list, convert it into a Pandas Dataframe Before anything, the first thing we need to decide is, how many rows and columns we want to have in our dataframe. A list of 12 elements can be converted into a dataframe of: 3 columns with 4 rows, 6 columns with…

https://thecodingbot.com/convert-a-python-list-to-a-pandas-dataframe/

Remove duplicate rows from a Pandas Dataframe

Problem Statement Given a Pandas dataframe, remove the duplicate rows. Solution There are certain functions available to remove duplicates or identify duplicated in the dataframe in Pandas. One such function is df.duplicated() and the other function is df.drop_duplicates(). df.duplicated() not exactly removes duplicates from the dataframe but it identifies them. It returns a boolean series,…

https://thecodingbot.com/remove-duplicate-rows-from-a-pandas-dataframe/

Python’s list count() method with examples

Overview In this tutorial, we will see Python’s sequence type list’s count() method in great detail. We will see its syntax, the parameters it takes, the value it returns, and some examples demonstrating its usage. We will also dig into the runtime cost of the operation. list.count(x) list.count(x) returns the number of times x appears in the…

https://thecodingbot.com/pythons-list-count-method-with-examples/

Different ways to delete an element from the Python list

Lists are probably python’s most versatile and used data structures. You will find it them in a significant number of python programs. They are also a mutable object. Mutable Object – The Python objects whose value can be changed after initialization without changing its identity are known as Mutable Python Object. In this tutorial, you will…

https://thecodingbot.com/delete-an-element-from-the-python-list/

Python’s list remove() method with examples

Overview What are the built-in functions in Python? Built-in methods are the utility methods provided by the Python interpreter for our use, and they come along when you install Python in your environment. It help us to skip implementing many common operations like converting an integer to binary form(using bin()), getting Unicode code point(using ord()), getting the…

https://thecodingbot.com/pythons-list-remove-method-with-examples/

Python’s list remove() time and space complexity analysis

Overview We have already discussed the list’s remove() method in great detail here. This tutorial shall only focus on the time and space complexity analysis of the method. Before discussing the time and space complexities, let’s quickly recall what this method is all about. list.remove() list.remove(x) deletes the first occurrence of element x from the list. If the…

https://thecodingbot.com/pythons-list-remove-time-and-space-complexity-analysis/

Swap every ith element of the array with the (i+2)th element

Problem Statement Given an array of positive integers of size N, the task is to swap every ith element with the (i+2)th element of the array Solution The idea is simple, iterate the array and repeat the swapping of ith element with (i+2)th element for every index in the range. For iteration, we can use…

https://thecodingbot.com/swap-every-ith-element-of-the-array-with-the-i2th-element/

Python’s list clear() method with examples

Overview What are the built-in functions in Python? Built-in methods are the utility methods provided by the Python interpreter for our use, and they come along when you install Python in your environment. It helps us to skip the implementation of many common operations like conversion of an integer to binary form(using bin()), getting Unicode code…

https://thecodingbot.com/pythons-list-clear-method-with-examples/

Swap adjacent elements of an array

Problem Statement Given an array of integers of size N, the task is to swap adjacent elements. Solution This problem is very similar to Swap every ith element of the array with the (i+2)th element, and the solutions are also going to be pretty similar. The idea is simple, iterate the array and repeat the swapping…

https://thecodingbot.com/swap-adjacent-elements-of-an-array/

Given a binary tree, find the node with maximum(or minimum) value

Problem Statement Given a binary tree, find the node with maximum(or minimum) value. Solution There exist a general approach to solve these kinds of problems where we have to find some property(maximum, minimum or height of the binary tree). It is clear that for us to find the node with the maximum or minimum value,…

https://thecodingbot.com/given-a-binary-tree-find-the-node-with-maximumor-minimum-value/

Given a binary tree, find it’s Maximum Depth(or height)

Problem Statement Given a binary tree, find it’s maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example :              13             /…

https://thecodingbot.com/given-a-binary-tree-find-its-maximum-depthor-height/

Printing complete star triangle in C++

Problem Statement Given the number of rows, form a complete triangle made up of stars(asterisks) “*”. For Example Input: 5 Output: Complete star triangle pattern in C++ Solution This is an easy problem which can be solved simply using nested loops. Let’s try to understand this problem with an example. Consider the input number of rows…

https://thecodingbot.com/printing-complete-star-triangle-in-c/

Two ways to reverse a number in C++

Problem Statement Given an integer, the task is to find the reverse of it. It is sure that number as well as it’s reverse fits in the range of an integer. Example: Input: 3421 Output: 1243 Approach 1 – Constructing the reverse using the original number Step 1: Check if the number is negative or not.…

https://thecodingbot.com/two-ways-to-reverse-a-number-in-c/

Python’s list reverse() function with examples

Overview In this tutorial, we will discuss Python list’s built-in method –reverse(). Talking about the built-in methods, they are the utility methods provided by the Python interpreter for our use; and they come along when you install Python in your environment. They provide us the implementation of many common operations like conversion of an integer…

https://thecodingbot.com/pythons-list-reverse-function-with-examples/

Print inverted half star triangle pattern in C++

Problem Statement Given the number of rows, form an inverted half triangle pattern made up of stars(asterisks) “*”. For Example Input: 5 Output: Inverted half star triangle pattern in C++ Solution This is an easy problem which can be solved simply using nested loops. Let’s try to understand this problem with an example. Consider the input number…

https://thecodingbot.com/print-inverted-half-star-triangle-pattern-in-c/

Best place to start Machine Learning and Kaggle Journey https://www.dataquest.io/blog/kaggle-fundamentals/

Pretty easy guide to follow. Happy learning :)

Complete competitive programming syllabus https://discuss.codechef.com/t/competitive-programming-syllabus/10873

Python program to split a given list into Even and Odd list based on the parity of the numbers

Problem Statement Given a python list consisting of integers, based on their parity, separate them into even and odd list. For example: Input: list = [1,4,6,87] Output: even_list = [4,6] , odd_list = [1,87] The problem statement is pretty clear – we have a list of integers and we need to separate them into two…

https://thecodingbot.com/python-program-to-split-a-given-list-into-even-and-odd-list-based-on-the-parity-of-the-numbers/