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Technical articles with clear explanations and examples
Python – Test if list is Palindrome
A palindrome is a sequence that reads the same forwards and backwards. To test if a Python list is a palindrome, we can compare it with its reversed version using slice notation [::-1]. Method 1: Direct List Comparison The simplest approach is to compare the original list with its reverse ? def is_palindrome_list(data): return data == data[::-1] # Test with palindrome list numbers = [1, 2, 3, 2, 1] print("List:", numbers) print("Is palindrome:", is_palindrome_list(numbers)) # Test with non-palindrome list numbers2 = [1, 2, 3, 4, 5] print("List:", numbers2) print("Is palindrome:", ...
Read MorePython – Row with Minimum difference in extreme values
When it is required to get the row with minimum difference in extreme values, list comprehension, the min() method and max() methods are used. Example Below is a demonstration of the same − my_list = [[41, 1, 38], [25, 33, 1], [13, 44, 65], [1, 22]] print("The list is : ") print(my_list) my_min_val = min([max(elem) - min(elem) for elem in my_list]) my_result = [elem for elem in my_list if max(elem) - min(elem) == my_min_val] print("The result is : ") print(my_result) The output of the above code is − ...
Read MorePython - Filter Pandas DataFrame by Time
Filtering a Pandas DataFrame by time allows you to extract records that meet specific date or time conditions. Use the loc indexer with datetime comparisons to filter rows based on date ranges. Basic Time Filtering with loc First, create a DataFrame with date information ? import pandas as pd # Create dictionary with car purchase data data = { 'Car': ['BMW', 'Lexus', 'Audi', 'Mercedes', 'Jaguar', 'Bentley'], 'Date_of_Purchase': ['2021-07-10', '2021-08-12', '2021-06-17', '2021-03-16', '2021-05-19', '2021-08-22'] } # Create DataFrame dataFrame = pd.DataFrame(data) print("Original DataFrame:") print(dataFrame) ...
Read MorePython Program to Remove Palindromic Elements from a List
When it is required to remove palindromic elements from a list, list comprehension and the 'not' operator are used. A palindromic number reads the same forwards and backwards, like 121 or 9. Example Below is a demonstration of removing palindromic elements from a list − my_list = [56, 78, 12, 32, 4, 8, 9, 100, 11] print("The list is:") print(my_list) my_result = [elem for elem in my_list if int(str(elem)[::-1]) not in my_list] print("The result is:") print(my_result) Output The list is: [56, 78, 12, 32, 4, 8, 9, 100, 11] ...
Read MorePython Pandas - Count the number of rows in each group
Pandas groupby() operations allow you to split data into groups and count rows in each group using size(). This is useful for analyzing data distribution and finding group frequencies. Creating the DataFrame First, let's create a sample DataFrame with product data ? import pandas as pd # Create a DataFrame dataFrame = pd.DataFrame({ 'Product Category': ['Computer', 'Mobile Phone', 'Electronics', 'Electronics', 'Computer', 'Mobile Phone'], 'Quantity': [10, 50, 10, 20, 25, 50], 'Product Name': ['Keyboard', 'Charger', 'SmartTV', 'Camera', 'Graphic Card', 'Earphone'] }) print("DataFrame:") print(dataFrame) ...
Read MorePython – N sized substrings with K distinct characters
When working with strings, you might need to find all substrings of a specific length that contain exactly K distinct characters. This can be achieved by iterating through the string and using Python's set() method to count unique characters in each substring. Syntax The general approach involves: for i in range(len(string) - n + 1): substring = string[i:i+n] if len(set(substring)) == k: # Add to result Example Below is a demonstration that finds all 2-character substrings with ...
Read MorePython – Merge Dictionaries List with duplicate Keys
When working with lists of dictionaries, you often need to merge them while handling duplicate keys. This process involves iterating through corresponding dictionaries and adding keys that don't already exist. Basic Dictionary List Merging Here's how to merge two lists of dictionaries, keeping original values for duplicate keys ? list1 = [{"aba": 1, "best": 4}, {"python": 10, "fun": 15}, {"scala": "fun"}] list2 = [{"scala": 6}, {"python": 3, "best": 10}, {"java": 1}] print("First list:") print(list1) print("Second list:") print(list2) # Merge dictionaries at corresponding positions for i in range(len(list1)): existing_keys = list(list1[i].keys()) ...
Read MorePython Pandas - Sort DataFrame in descending order according to the element frequency
To sort a Pandas DataFrame in descending order according to element frequency, you need to group the data, count occurrences, and use sort_values() with ascending=False. Basic Syntax The key is combining groupby(), count(), and sort_values() ? df.groupby(['column']).count().sort_values(['count_column'], ascending=False) Creating Sample Data Let's create a DataFrame with car data to demonstrate frequency sorting ? import pandas as pd # Create DataFrame with duplicate car entries dataFrame = pd.DataFrame({ "Car": ['BMW', 'Lexus', 'BMW', 'Mustang', 'Mercedes', 'Lexus'], "Reg_Price": [7000, 1500, 5000, 8000, 9000, 2000], ...
Read MorePython - Move a column to the first position in Pandas DataFrame?
Use pop() to remove a column and insert() to place it at the first position in a Pandas DataFrame. This technique allows you to reorder columns efficiently without creating a new DataFrame. Creating the DataFrame First, let's create a sample DataFrame with three columns ? import pandas as pd # Create DataFrame dataFrame = pd.DataFrame( { "Student": ['Jack', 'Robin', 'Ted', 'Marc', 'Scarlett', 'Kat', 'John'], "Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass'], ...
Read MorePython – Display only non-duplicate values from a DataFrame
In this tutorial, we will learn how to display only non-duplicate values from a Pandas DataFrame. We'll use the duplicated() method combined with the logical NOT operator (~) to filter out duplicate entries. Creating a DataFrame with Duplicates First, let's create a DataFrame containing duplicate values ? import pandas as pd # Create DataFrame with duplicate student names dataFrame = pd.DataFrame({ "Student": ['Jack', 'Robin', 'Ted', 'Robin', 'Scarlett', 'Kat', 'Ted'], "Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass'] }) print("Original DataFrame:") print(dataFrame) Original DataFrame: ...
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