PyCharm does this. In addition to doing type inference while you have your project open, you can while debugging it run it and make it collect type information.

PyCharm does this. In addition to doing type inference while you have your project open, you can while debugging it run it and make it collect type information. That's quite a bit slower than usual, but once done you will get extra type hints of possible types passed to your functions. http://blog.jetbrains.com/pycharm/2013/02/dynamic-runtime-type-inference-in-pycharm-2-7/ http://blog.jetbrains.com/pycharm/2013/02/dynamic-runtime-ty...