Python Tutorial

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 […]

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.

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

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

Python dictionary is something like java map. It can hold key value pair values. This example will tell you some basic python dictionary object operations. It includes how to create, add, change and remove python dictionary key and values.

When you operate on a python string, it will create a new python string based on the original string. The original string value will not be changed. This article will list some python string operation example.

In python there are only two boolean value : True or False. And all Python object can be expressed as Boolean value, regardless of their own value. For example all python variable which value is 0’s boolean value is False, all python variable which value is not 0’s boolean value is True. Similarly, empty container

When I run my python script code, I meet an error like this IndentationError: unindent does not match any outer indentation level. This error is so strange and hard to find the reason. After some investigation, I finally find the solution.

When I develop my Django app example, I meet an error with TemplateSyntaxError: Could Not Parse The Remainder error message like below. This error is so strange but so simple to fix, but it cost me a lot of time. So I want to write down the solution here for the reader to fix it