When I develop the iOS application, I need a mac computer. But as you know, the mac computer is too expensive, so I have an idea to install the macOS on VirtualBox virtual machine, and then I can develop the iOS app on that virtual machine.
How To Download MacOS X High Sierra Installer In Mojave Read More »
When I copy an iso file from macOS to a USB disk, I meet The item can’t be copied because it is too large for the volume’s format error message. This article will tell you how to fix this error.
This article will tell you how to download the macOS Mojave installer file to your Mac, and how to convert the installer file to an iso file. Then you can use the iso file to install macOS on a virtual machine.
How To Download MacOS Mojave Installer And Convert To ISO File Read More »
The macOS spotlight search function is a useful function that can help you find files in your Mac. For example, if you want to search a file, you just need to press Command + Space to popup the spotlight searches input box and then input the part text of the file name in the search
How To Disable MacOS Spotlight Keyboard Shortcut Command + Space Read More »
Scala is based on java virtual machines, so if you want to learn scala programming, you need first install JDK, then install scala. This article will tell you how to install JDK and scala on both Ubuntu Linux, Windows, and macOS.
How To Install Java Jdk And Scala On Ubuntu Linux, Windows, MacOS Read More »
Configuration file in python is a text file which contains section and seciton’s options. The file extension is .ini. This is same with windows .ini file. One configuration file can contains multiple sections. And python configparser.ConfigParser class provide methods to read, write, update and remove the .ini file content. This article will show you some
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When you want to import a python module library in your python source code, you need first to make the python module library importable by adding the module package path in the PYTHONPATH system environment variable. You can also add the python module package path to the python module search path at runtime in python
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When creating Python source code, you often save custom modules in separate Python files. Each of these files serves as a Python module. Occasionally, you may find the need to import these modules (whose full file paths you’re aware of) into other Python source code during runtime. This article outlines how to accomplish this.
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Psycopg is a popular python postgresql database driver library which provide access to postgresql database server. Use psycopg, you can connect to postgresql database and execute sql statement easily in python source code. This article will tell you how to connect to postgresql database server use psycopg2, it also tell you how to run sql
How To Connect To PostgreSQL Database And Execute SQL Statement Use Psycopg2 In Python Read More »
When I connect to my local PostgreSQL database server with command $ psql postgres ‘postgres’ I encounter the error message psql: FATAL: Peer authentication failed for user “postgres”. :~$ psql postgres ‘postgres’ psql: FATAL: Peer authentication failed for user “postgres” After investigating I finally find the solution to fix this error. This error is because