Matplotlib GridSpec: Spans, Ratios, and Custom Layouts
Use Matplotlib GridSpec for subplot spans, width and height ratios, dashboard layouts, colorbars, spacing, and constrained layout.
Python Blog: Tutorials, Fixes, and Projects
Browse practical Python tutorials, error fixes, library guides, data science examples, and project ideas from Python Pool.
cv2.findHomography in Python: RANSAC, Points, and Inlier Masks
Use cv2.findHomography in Python with matching points, RANSAC, reprojection thresholds, inlier masks, and common matrix errors.
Fix Unterminated String Literal in Python: Quotes and EOL
Find the unmatched quote behind an unterminated Python string, then choose correct delimiters, multiline syntax, escapes, or pathlib.
cv2.boundingRect() in Python: Get x, y, width, and height
Learn how cv2.boundingRect() returns an upright rectangle as x, y, width, and height, then use it to draw boxes, crop regions, and filter detections.
Matplotlib Slider: Interactive Controls, Callbacks, and Reset
Build an interactive Matplotlib Slider with callbacks, valstep, reset behavior, layout, and backend checks for responsive plot controls.
Python getopt: Parse Short and Long Command-Line Options
Use Python getopt to parse short and long command-line options, validate required arguments, handle errors, and know when argparse is the better choice.
Draw Rectangles in Matplotlib with Rectangle and add_patch
Draw Matplotlib rectangles with Rectangle, add_patch, data coordinates, styling, rotation, image boxes, zorder, and readable limits.
Matplotlib Aspect Ratio: set_aspect() and set_box_aspect()
Control Matplotlib plot aspect ratios with set_aspect(), axis(‘equal’), imshow(), set_box_aspect(), and figure sizing.
Check if a NumPy Array Is Empty: size, shape, and Safe Tests
Check whether a NumPy array is empty with size, avoid ambiguous truth-value errors, distinguish zero-size shapes from NaN values, and handle dimensions explicitly.
NumPy arctan2(): Angles, Quadrants, Zeros, and Arrays
Use NumPy arctan2() for signed angles with correct quadrants, broadcasting, degrees, zero inputs, infinities, and vectorized arrays.