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Technical articles with clear explanations and examples
Matplotlib – Make a Frequency histogram from a list with tuple elements in Python
To make a frequency histogram from a list with tuple elements in Python, we can extract the categories and frequencies from tuples and create a bar chart using Matplotlib. Steps to Create a Frequency Histogram Set the figure size and adjust the padding between and around the subplots Create a list of tuples containing category-frequency pairs Extract categories and frequencies by iterating through the data Create a bar plot using bar() method Display the figure using show() method Example Here's how to create a frequency histogram from tuple data ? import matplotlib.pyplot ...
Read MoreHow to rotate a simple matplotlib Axes?
To rotate a simple matplotlib axes, we can use the Affine2D transformation along with floating_axes. This technique creates a rotated coordinate system for plotting data at different angles. Required Imports First, import the necessary packages for creating rotated axes ? import matplotlib.pyplot as plt from matplotlib.transforms import Affine2D import mpl_toolkits.axisartist.floating_axes as floating_axes Steps to Rotate Axes The rotation process involves these key steps: Create an affine transformation − Define the rotation angle using Affine2D().rotate_deg() Set axis limits − Define the coordinate range for both x and y axes Create grid helper ...
Read MoreHow to add a 3d subplot to a matplotlib figure?
To add a 3D subplot to a matplotlib figure, you need to specify projection='3d' when creating the subplot. This enables three-dimensional plotting capabilities for visualizing data in 3D space. Basic Steps Follow these steps to create a 3D subplot ? Import matplotlib and numpy libraries Create x, y and z data points Create a figure using plt.figure() Add a subplot with projection='3d' parameter Plot the 3D data using appropriate plotting methods Display the figure with plt.show() Example: Creating a 3D Line Plot Here's how to create a basic 3D line plot ? ...
Read MoreHow to delete a column from Pandas DataFrame
To delete a column from a Pandas DataFrame, you have several methods available: del statement, drop() method, and pop() method. Each approach has its own use cases and advantages. Using del Statement The del statement permanently removes a column from the DataFrame ? import pandas as pd # Create DataFrame dataFrame = pd.DataFrame({ "Car": ['BMW', 'Lexus', 'Audi', 'Mustang', 'Bentley', 'Jaguar'], "Units": [100, 150, 110, 80, 110, 90], "Price": [50000, 60000, 45000, 40000, 80000, 70000] }) print("Original DataFrame:") print(dataFrame) # Delete a ...
Read MorePython – Sort Strings by Case difference
When working with strings in Python, you may need to sort them based on the case difference — the absolute difference between uppercase and lowercase letters. This technique uses custom sorting with the sort() method and a key function that calculates case differences. Understanding Case Difference Case difference is calculated by counting uppercase and lowercase letters in each string, then finding their absolute difference. Strings with smaller case differences are considered "more balanced" and appear first when sorted. Example Here's how to sort strings by case difference using a custom function ? def get_diff(my_string): ...
Read MorePython – Filter Similar Case Strings
When it is required to filter similar case strings, list comprehension can be used along with isupper() and islower() methods. This technique helps identify strings that are either completely uppercase or completely lowercase, filtering out mixed-case strings. Example Below is a demonstration of filtering strings with consistent casing ? my_list = ["Python", "good", "FOr", "few", "CODERS"] print("The list is :") print(my_list) my_result = [sub for sub in my_list if sub.islower() or sub.isupper()] print("The strings with same case are :") print(my_result) Output The list is : ['Python', 'good', 'FOr', 'few', ...
Read MorePython Pandas - How to select rows from a DataFrame by integer location
To select rows by integer location in a Pandas DataFrame, use the iloc accessor. The iloc method allows you to select rows and columns by their integer position, starting from 0. Creating a Sample DataFrame Let's start by creating a DataFrame to work with ? import pandas as pd # Create DataFrame dataFrame = pd.DataFrame([[10, 15], [20, 25], [30, 35]], index=['x', 'y', 'z'], ...
Read MorePython – Convert Suffix denomination to Values
When working with financial or numerical data, you often encounter values with suffix denominations like "5Cr" (5 Crores), "7M" (7 Million), or "30K" (30 Thousand). Python allows you to convert these suffix notations to their actual numerical values using dictionaries and string manipulation. Example Below is a demonstration of converting suffix denominations to values ? my_list = ["5Cr", "7M", "9B", "12L", "20Tr", "30K"] print("The list is :") print(my_list) value_dict = {"M": 1000000, "B": 1000000000, "Cr": 10000000, "L": 100000, "K": 1000, ...
Read MorePython Pandas - How to select rows from a DataFrame by passing row label
To select rows by passing a label, use the loc[] accessor in Pandas. You can specify the index label to retrieve specific rows from a DataFrame. The loc[] accessor is label-based and allows you to select data by row and column labels. Creating a DataFrame with Custom Index Labels First, let's create a DataFrame with custom index labels ? import pandas as pd # Create DataFrame with custom index labels dataFrame = pd.DataFrame([[10, 15], [20, 25], [30, 35]], ...
Read MorePython - Cast datatype of only a single column in a Pandas DataFrame
In Pandas, you can cast the datatype of only a single column using the astype()
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