Python - Common built-in functions

map map() will map the specified sequence according to the provided function. The first parameter function calls the function function with each element in the parameter sequence and returns a new list containing the return value of each function function. Return the list in Python 2 and the iterator in Python 3. def square(x): return x ** ...

Posted by austrainer on Wed, 04 May 2022 21:33:38 +0300

How to draw color blocks with python matplotlib imshow and pcolormesh

preface Sometime, somewhere, the sun is bright. I clasp my fingers, lie behind my head, stretch my waist, shake my legs, and look up at the sky. It seems a little lazy. However, there was only one thought at that time, just like the poor photon that mistakenly entered the cavity of the blackbody, jumping repeatedly in my mind - "who t ...

Posted by interpim on Wed, 04 May 2022 16:47:31 +0300

Urlib2 Library - Introduction to Python crawler Foundation Series (12)

Tip: there are benefits at the end of the article! Latest Python crawler materials / Study Guide > > Poke me directly preface Urlib2 Library Urlib2 is python2 7 comes with a module (no need to download), which supports a variety of network protocols, such as FTP, HTTP, HTTPS, etc Urlib2 in Python 3 Changed to urllib in X request ...

Posted by jagguy on Wed, 04 May 2022 11:44:28 +0300

Multi process and multi thread programming in Linux

Creation and application of thread in Linux Multithreading programming technology in Linux is widely used. Multithreading can improve the running efficiency and convenience of programs. Multithreading programming technology is widely used in larger Linux programs. The communication problem between threads is how thread A passes messages to thr ...

Posted by svenski on Wed, 04 May 2022 11:07:14 +0300

Actual combat PyQt5: 088-QOpenGLWidget parts

Introduction to qoopenglwidget The qoopenglwidget class is a widget used to render OpenGL graphics. The QOpenGLWidget provides functionality for displaying OpenGL graphics integrated into Qt applications. It's easy to use: let the application's class inherit from it and use subclasses like any other QWidget, and it can choose between using QPa ...

Posted by pharcyde0 on Wed, 04 May 2022 06:30:19 +0300

How to divide by 0 in python

CSDN blog divide by 0 problem >This blog is used to record how to deal with the problem of dividing by 0 in python. > Problems encountered: in the process of writing matrix operation and machine learning, we will encounter the problem of matrix division. The previous processing method is to check each element one by one before division, ...

Posted by netpants on Wed, 04 May 2022 01:16:37 +0300

[MIT 6.0001 course notes] structure 3 String Manipulation, Guess and Check, Approximations, Bisection

Lecture 3. String Manipulation, Guess and Check, Approximations, Bisection In class readings Chapter 3.1 and 3.3-3.5 PPT Lecture 3 task Problem Set 1 (Continued) Formal notes String Manipulation string operation Treat a string as an ordered string Can be compared with = =, >, <, etc len() is a function that gets the len ...

Posted by virendrachandak on Wed, 04 May 2022 00:07:33 +0300

PTA ~ basic programming part question set

Calculate residents' water charges by sections 7-11 ~ 10 In order to encourage residents to save water, the water company adopts the method of step pricing according to water consumption. The water fee y (yuan) payable by residents is related to the monthly water consumption x (ton): when X does not exceed 15 tons, y=4x/3; After exceeding, ...

Posted by dougmcc1 on Tue, 03 May 2022 23:14:13 +0300

Image classification dataset (fashion MNIST)

Image classification dataset (fashion MNIST) The most commonly used image classification dataset is the handwritten numeral recognition dataset MNIST[1]. However, the classification accuracy of most models on MNIST exceeds 95%. In order to more intuitively observe the differences between algorithms, we will use a data set with more complex ima ...

Posted by F.Danials on Tue, 03 May 2022 15:43:56 +0300

django project creation

0x01 Django management tool After installing Django, you should now have the available administrative tool Django admin Py, if Windows does not configure environment variables, you can use Django admin. We can use Django admin Py to create a project: Let's take a look at the command introduction of Django admin: $ django-admin.py Type 'djan ...

Posted by Chetan on Tue, 03 May 2022 11:53:22 +0300