python2 与 python3 不兼容问题总结【持续更新】

1.python3 下报错：’dict’ object has no attribute ‘iteritems’

python2 下为 .iteritems()
python3 下为 .items()

a={'1':1,'2':2}a.items()Out[26]: dict_items([('2', 2), ('1', 1)])

2.python3下报错.TypeError: ‘dict_keys’ object does not support indexing

如果使用的是python2

firstStr = myTree.keys()[0]

LZ使用的是python3

firstSides = list(myTree.keys())firstStr = firstSides[0]

3.python3报错：pickle.dump(inputTree,fw) TypeError: write() argument must be str, not bytes

python序列化保存对象到文件时出错
python2：

import picklefw = open(filename,'w')pickle.dump(inputTree,fw)fw.close()

python3：

def storeTree(inputTree,filename):    import pickle    fw = open(filename,'wb')    pickle.dump(inputTree,fw)    fw.close()def grabTree(filename):    import pickle    fr = open(filename,'rb')    return pickle.load(fr)