import pickle
import matplotlib.pyplot as plt
from sklearn import datasets
from sklearn.model_selection import train_test_split
from sklearn.neighbors import KNeighborsClassifier
from sklearn.
Abstract. Qt’s Undo Framework is an implementation of the Command Pattern, for implementing undo/redo functionality in applications. The Command pattern is based on the idea that all editing in an app
什么是框架？ 框架是包含了共享资源的分层文件夹，包含了动态共享库，nib文件，图像文件，本地化字符串头文件，引用文档在一个包里。多个程序可以同时使用所有这些资源。系统把他们加载进内存并且让所有程序共享这些资源的同一份拷贝。 框架也是一个bundle，并且内容可以被cocoa NSBundle类或CF Foundation Bu
