how to make web framework based on Python like django?
I would also browse the documentation for Paste and read a bit from Ian Bicking.. He lays out the conceptual blocks so to speak, quite well and has bloggedthe lessons learned as it was developed.
Web2py doco also
but yes as UKU said: WSGI is a modern requirement.
I'm just wondering what knowledge or techniques are needed to make a web framework like django. 
so the webframework is able to serve as a cloud computing (a website can be scaled horizontally by sending some stuffs that must be solved to other server.) when needed, and can be used to build a website fast like django if a developer want to build a just simple website.
Sorry. my English is very awkward cause I'm an Korean.
just give me some approaches or instructions about what techniques are needed to build a web framework or what I have to do or learn. 
Thanks a lot.