C × unsafe code

C × unsafe code When a code block is marked with the unsafe modifier, C ා allows pointer variables to be used in functions. Unsafe or unmanaged code refers to blocks of code that use pointer variables. Pointer variable A pointer is a variable whose value is the address of another variable, tha ...

Posted by Gokul on Thu, 16 Jan 2020 05:46:52 -0800

[Xuefeng magnetic needle stone blog] Bokeh data visualization tool 2 drawing foundation

Linear graph #Creating a line plot #Importing the required packages from bokeh.io import output_file, show from bokeh.plotting import figure #Creating our data arrays used for plotting the line plot x = [5,6,7,8,9,10] y = [1,2,3,4,5,6] #Calling the figure() function to create the figure of the plot plot = figure() #Creating a ...

Posted by Madzz on Sat, 11 Jan 2020 07:27:08 -0800

python basic learning 11 ---- functions

1, Definition of function def function name (parameter list): Function body return statement Return statement without writing or adding any object after it is return None 2, Parameters of function No parameter def func1(): print("No parameters") One parameter def func1(a): return a Multiple parameters def func1(a,b,c): ...

Posted by kelseyirene on Thu, 02 Jan 2020 20:59:44 -0800

grep of linux regular expression

Regular expression is the way to deal with strings. It can perform specific character handlers such as find, delete, and replace. Common commands grep, awk, sed [: alunm:] represents English case characters and numbers, i.e. 0-9 A-Z a-z [: alpha:] represents any English case letter A-Z A-Z [: blank:] represents the space b ...

Posted by cuteflower on Wed, 01 Jan 2020 02:07:59 -0800

Android development sets various properties of linear layout and relative layout RelativeLayout in the code

1. In the first case, I do not define the xml layout file at all. The layout file is completely written in the Java file. The code is as follows: import android.annotation.SuppressLint; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import and ...

Posted by Cateyes on Sun, 01 Dec 2019 13:50:18 -0800

04-tkinter's Entry Notes

Text box Entry is usually a single-line text box in the following format:Entry (parent object, options,...) Common options parameters: bg or background: Background color. borderwidth or bd: The boundary width, which defaults to 2 pixels. command: this function is automatically executed when the user changes the content. cursor: The shape of th ...

Posted by webbnino on Sat, 16 Nov 2019 18:12:40 -0800

Git Branch Management - Create, Merge, Delete Branches

Preface: Almost all version control supports branching in some way.Using branching means that you can separate your work from the development main line, so as not to affect it. Git's branching model is known as its "must-kill" feature, which makes Git stand out from many version control systems.Git handles branches incredibly lightwe ...

Posted by PURU on Thu, 14 Nov 2019 14:17:44 -0800

[advanced search] chivalry

Title Link Solving problems There are many ways to solve this problem. First of all, let's think about it. If it's more than 15, it will output - 1. Then let's find the minimum value. Obviously. It can be done with iteration deepening. We can enumerate the minimum steps directly. But that's only 20 points... You know, if t ...

Posted by DanielHardy on Wed, 13 Nov 2019 07:27:22 -0800

Python(day.5 function and Lambda expression)

function To create a function, the keyword del is used, followed by a colon and its executor. >>>del MyFirstFunction(): print('hello') print('world') print('!') >>>MyFirstFunction() hello world ! Parameters of function When calling a function, the parameter position should b ...

Posted by designxperts on Sat, 26 Oct 2019 08:08:38 -0700

centos7 installs MySQL 5.17 online and configures remote access

Environmental Science: centos7 mysql5.7Installation: Official Yum RepositoryOther notes: If you need to install other versions, please switch rpm version by yourself. This installation version is 57, that is, the asterisk position is "57". After MySQL 5.7, the password policy does not allow w ...

Posted by shawngibson on Tue, 01 Oct 2019 12:36:42 -0700