代写Python系列作业，实现Optical character recognition

This semester you will be writing a program that models elements of recognizing and creating characters. Optical character recognition is an important area of research that allows photographs or printed documents to be digitized; by doing so, these documents are made available for machine-based searching. On the flip side, http://en.wikipedia.org/wiki/CAPTCHAis a system for differentiating between humans and computers: the goal here is to generate a non-machine readable image that