What is the most efficent way to implement concurrency in Python?

In a cluster envir开发者_开发技巧onment using Python what is the least expensive way to develop a concurrent application or what is the pro / con of the various options?

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I would say Google app engine is the easiest option since you don't have to worry about all this things. But if it's a big project, it might not be the cheapest solution.

Again, it really depends on the size of your project and what you really want to do.

You need to give more details if you want to get a precise answer.

There is also a few packages available on the python package index.