The PHP problem for me least is always available of existing projects I can modify. The last thing I did was an availability calendar and I soon found a perfect

The PHP problem for me least is always available of existing projects I can modify. The last thing I did was an availability calendar and I soon found a perfect opensource one already written in PHP. A few customer specific modifications later, and I had finished my task. I did look for one in python, but didn't find anything. If I had to write one from scratch, it would be in python, but why reinvent the wheel?