Ben Chuanlong Du's Blog

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Static Type Checking of Python Scripts Using pytype

Configuration

There are 3 ways to control the behavior of `pytype.

  1. Pass command-line options to pytype.

  2. Specify a configuration file using pytype --config /path/to/config/file .... You can generate an example configuration file using the command pytype --generate-config pytype.cfg.

  3. If no configuration file is found, pytype uses the …

Call Java Using PyJNIus from Python

PyJNIus is a simple-to-use Java interface for Python. However, JPype is a better alternative.

Installation

pip install Cython
pip install pyjnius

Example with Imported Jar

import os
os.environ["CLASSPATH"] = "/path/to/your.jar"
from jnius import autoclass
YourClass = autoclass(path.to.YourClass)
yourObj = YourClass()

Note: Avoid using the same …

Java Interfaces for Python

JPype, py4j and PyJNIus are all good options for Java interface for Python. Jpype is easy to use and widely adopted. PyJNIus is an even easier solution compred to JPype. py4j is more complicated to use compared to JPype and PyJNIus, however, it has a better performance, generally speaking.

JPype …

Avoid Database Lock in SQLite3

  1. According to https://www.sqlite.org/lockingv3.html, POSIX advisory locking is known to be buggy or even unimplemented on many NFS implementations (including recent versions of Mac OS X) and that there are reports of locking problems for network filesystems under Windows. So, the rule of thumb is to …

Make Your Linux Server Securer

  1. Define host access rules in /etc/hosts.allow and /etc/hosts.deny. Usually I only allow login to my private server from my home and work ip. If I have to login into my private server from some other network, I login to a computer at my workplace, login into …