Creating a lock file (say, in /tmp) is a common approach. On launch, check to see if the file already exists. If it does, exit. Otherwise, create it and continue. This can lead to problems if your app ...

Think it's complex to connect your Python program to the UNIX shell? Think again! In past articles, I've looked into concurrency in Python via threads (see "Thinking Concurrently: How Modern Network ...

Python's "multiprocessing" module feels like threads, but actually launches processes. Many people, when they start to work with Python, are excited to hear that the language supports threading. And, ...