python 学习笔记

print在python3中已经是一个函数而不是一条命令了，print(xxx)

错误：NameError: name 'raw_input' is not defined

解决：python3.x系列不再有 raw_input 函数。3.x中 input 和从前的 raw_input 等效

错误：ImportError: No module named 'cPickle'

解决：python3以后 cPickle 和pickle 模块合并，所以直接引入 pickle

错误：p.dump(shoplist, f)  TypeError: must be str, not bytes

解决：python3以后  如果要用存储器，那么读写文件都要用‘rb’和'wb'模式。将 

    f = file(shoplistfile, 'w')改为  f = open(shoplistfile, 'wb')

           f = file(shoplistfile) 改为  f = open(shoplistfile, 'rb')

错误：except ShortInputException , x

解决：except ShortInputException   as  x