Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
Python - Merge a Matrix by the Elements of First Column
When it is required to merge a matrix by the elements of first column, a simple iteration and list comprehension with setdefault method is used. This technique groups rows that have the same value in their first column. Example Below is a demonstration of the same — my_list = [[41, "python"], [13, "pyt"], [41, "is"], [4, "always"], [3, "fun"]] print("The list is :") print(my_list) my_result = {} for key, value in my_list: my_result.setdefault(key, []).append(value) my_result = [[key] + value for key, value in my_result.items()] print("The result is :") ...
Read MorePython – Concatenate Strings in the Given Order
When you need to concatenate strings in a specific custom order, you can use simple iteration with index-based access. This technique allows you to rearrange and join string elements according to any desired sequence. Basic Example Below is a demonstration of concatenating strings in a custom order − my_list = ["pyt", "fun", "for", "learning"] print("The list is:") print(my_list) sort_order = [1, 0, 3, 2] my_result = '' for element in sort_order: my_result += my_list[element] print("The result is:") print(my_result) The list is: ['pyt', 'fun', 'for', 'learning'] ...
Read MorePython Program to remove elements that are less than K difference away in a list
When it is required to remove elements that are less than K difference away in a list, a simple iteration and 'if' condition is used. This technique ensures that any two consecutive elements in the final list have a difference of at least K. Example Below is a demonstration of the same − my_list = [13, 29, 24, 18, 40, 15] print("The list is :") print(my_list) K = 3 my_list = sorted(my_list) index = 0 while index < len(my_list) - 1: if my_list[index] + K > my_list[index ...
Read MorePython – Append List every Nth index
When you need to insert elements from one list at every Nth index position of another list, you can use enumerate() to track indices and conditionally insert elements. Basic Example Here's how to append a list every Nth index ? numbers = [13, 27, 48, 12, 21, 45, 28, 19, 63] append_list = ['P', 'Y', 'T'] N = 3 print("Original list:") print(numbers) print(f"Append list: {append_list}") print(f"N = {N}") result = [] for index, element in enumerate(numbers): if index % N == 0: ...
Read MorePython – Filter Tuples Product greater than K
When working with tuples in Python, you may need to filter tuples based on the product of their elements. This involves calculating the product of all elements in each tuple and keeping only those tuples where the product exceeds a threshold value K. Using List Comprehension with Helper Function The most readable approach is to create a helper function to calculate the product, then use list comprehension for filtering ? def tuples_product(tuple_data): result = 1 for element in tuple_data: result ...
Read MorePython – Adjacent elements in List
When working with lists in Python, you often need to find adjacent elements for each item. This involves getting the previous and next elements relative to each position in the list. Understanding Adjacent Elements Adjacent elements are the neighboring items in a list: For the first element, only the next element exists For the last element, only the previous element exists For middle elements, both previous and next elements exist Using enumerate() to Find Adjacent Elements The enumerate() function provides both index and value, making it easy to access neighboring elements ? ...
Read MorePython – Sort by Units Digit in a List
When sorting a list by its units digit (last digit), we can use a custom key function with the sort() method. This function converts each number to a string and extracts the last character using negative indexing. Using a Custom Key Function The most straightforward approach is to define a helper function that extracts the units digit ? def unit_sort(element): return str(element)[-1] numbers = [716, 134, 343, 24742] print("The list is:") print(numbers) numbers.sort(key=unit_sort) print("The result is:") print(numbers) The list is: [716, 134, 343, 24742] The ...
Read MorePython – Remove rows with Numbers
When working with nested lists in Python, you may need to remove rows that contain numeric values. This can be achieved using list comprehension combined with the not, any, and isinstance functions. Example Below is a demonstration of removing rows containing numbers ? data_rows = [[14, 'Pyt', 'fun'], ['Pyt', 'is', 'best'], [23, 51], ['Pyt', 'fun']] print("The list is :") print(data_rows) result = [row for row in data_rows if not any(isinstance(element, int) for element in row)] print("The result is :") print(result) Output The list is : [[14, 'Pyt', 'fun'], ['Pyt', ...
Read MorePython - Sort Matrix by Maximum Row element
When you need to sort a matrix by the maximum element in each row, you can use Python's sort() method with a custom key function. This technique is useful for organizing data based on the highest value in each row. Using a Custom Key Function Define a function that returns the maximum element of each row, then use it as the sorting key ? def sort_max(row): return max(row) my_list = [[15, 27, 18], [39, 20, 13], [13, 15, 56], [43, 13, 25]] print("The original matrix is:") print(my_list) my_list.sort(key=sort_max, reverse=True) ...
Read MorePython – Display the key of list value with maximum range
When it is required to display the key of list value with maximum range, a simple iteration is used. The range of a list is the difference between its maximum and minimum values. Example Below is a demonstration of the same − my_dict = {"pyt" : [26, 12, 34, 21], "fun" : [41, 27, 43, 53, 18], "learning" : [21, 30, 29, 13]} print("The dictionary is :") print(my_dict) max_range = 0 result_key = "" for key, values in my_dict.items(): current_range = max(values) - min(values) if ...
Read More