Programmer Group

Python's time processing module is widely used in daily use, but it is basically necessary to check the data when using it, which is still troublesome. Sort it out for convenient use in the future. catalogue Time related concepts Python time module Time formatting t PI DAR Other built-in functions of time module Properties contained ...

E-commerce Data Preprocessing Today we have preprocessed the business data, mainly processing 1.Extract order data for 2019 2.Handle data for business process inconsistencies (payment time is earlier than order time, payment time is longer than 30 minutes, order amount is less than 0, payment amount is less than 0) 3.Data with empty proces ...

day8 - dictionaries and collections 1 dictionary related operations and methods 1. The dictionary does not support addition, mu lt iplication and >, <, > =<= 2. Dictionary support = == print({'a': 10, 'b': 20} == {'b': 20, 'a': 10}) 3.in and not in Key in dictionary ---- judge whether the specified key exists in the dictionar ...

1 Preface The four algorithms are similar, and have the following similarities and differences 2 similarities and differences Take STR1 = "ABCDEF", STR2 = "zabcdze" as an example Similarities: 1. Get a target on a string; 2. The core of the algorithm is the idea of dynamic programming. difference: 1. The targets are d ...

preface When I am running a deep learning or neural network model training, we often need to run many epoch s. Of course, we are most concerned about the accuracy of the model and other parameters in the training, but before that, we need to go through a parameter adjustment process. The parameter adjustment process is often determined a ...

brief introduction From: Easy to understand and explain linked list One way linked list: Bidirectional linked list: Look at the picture and understand... Bidirectional linked list data structure From: Data structure - bidirectional linked list (Python Implementation) Data structure has always been a very important part in the programm ...

color space Change color space (cv2.cvtColor()) There are more than 150 color space conversion methods in OpenCV. However, we only need to study the two most commonly used methods: BGR to GRAY and BGR to HSV. We use the cv.cvtColor(input_image, flag) function for color conversion, where flag determines the type of conversion. For BGR ...

openCV Window, mouse and keyboard operation Comprehensive example Generate a 500 * 500 pure black canvas, create a window, add mouse events to the window, and use the window to display images import cv2 import numpy as np # Generate 500 * 500 pure black canvas convas = np.zeros(shape=(512, 512, 3), dtype=np.uint8) # crea ...

01 - Common Pytest commands 1.Run a single use case pytest -v test_day01.py::test_simple_case1 Operation effect: Administrator@PC-202102061358 MINGW64 /d/python_demo/pytest $ pytest -v test_day01.py::test_simple_case1 =========================================================================================== test session starts ========= ...

1, Demand analysis In order to meet the needs of users to quickly extract pictures from docx files to specified folders, the system should meet the following functions: When the user selects the docx file and specifies the image output path, all images in the docx file can be extracted.When the file selected by the user is not a docx file ...