机器学习实战一 kNN错误及修正

FileNotFoundError: [Errno 2] No such file or directory: 'datingTestSet.txt'

datingDataMat,datingLabels = kNN.file2matrix('datingTestSet.txt')

一定注意：
datingTestSet.txt要与本py文件在同一个文件夹下

ValueError: invalid literal for int() with base 10: 'largeDoses'

原因：
本书的实例代码出错了，此处应该要用datingTestSet2.txt，因为datingTestSet2.txt的末尾列为数字，而datingTestSet.txt末尾列为字符串。

 File "H:PycharmProjectkNN-master机器学习实战（中文版+英文版+源代码）机器学习实战源代码machinelearninginactionCh02kNN.py", line 30, in classify0
    sortedClassCount = sorted(classCount.iteritems(), key=operator.itemgetter(1), reverse=True)
AttributeError: 'dict' object has no attribute 'iteritems'

python2.x版本有iteritems，而python3.x将它删除了，将其改为items即可

kNN.classify0([0,0],group,labels,3)

 File "H:PycharmProjectkNN-master机器学习实战（中文版+英文版+源代码）机器学习实战源代码machinelearninginactionCh02kNN.py", line 92, in classifyPerson
    classifierResult = classify0((inArr-minVals)/ranges,normMat,datingLabels,3)
TypeError: unsupported operand type(s) for -: 'set' and 'float'

将下面这行代码改正：

 inArr = array({ffMiles,percentTats,iceCream})

inArr = [ffMiles,percentTats,iceCream]

https://blog.csdn.net/qq_44940689/article/details/120895909
https://blog.csdn.net/michaelhan3/article/details/74017111