Python：用sys.stdin和sys.stdout从文件中读写数据

#!/usr/bin/env python
# coding:UTF-8


"""
@version: python3.x
@author:曹新健
@contact: [email protected]
@software: PyCharm
@file: 0925ex.py
@time: 2018/9/25 22:37
"""

import  sys

#数据区start
zhangSan = {"name":"张三","age":18,"pay":200,"job":"学生"}
liSi = {"name":"李四","age":28,"pay":20000,"job":"程序员"}
LeeMin = {"name":"LeeMin","age":26,"pay":30000,"job":"销售"}

person = {}
person["zhangSan"] = zhangSan
person["liSi"] = liSi
person["LeeMin"] = LeeMin
#数据区end

#标志区
fileName = "people-file"
ENDDB = "enddb."
ENDREC = "endrec."
RECSEP = "=>"

#代码区
def storeDbase(db,file):
    with open(file,"w") as dbFile:
        sys.stdout = dbFile
        for key in db:
            print(key)
            for (name,value) in db[key].items():
                #print(1,file=dbFile)
                print(name+RECSEP+repr(value))
            print(ENDREC)
        print(ENDDB,)


def loadDbse(file):
    with open(file) as dbFile:
        db = {}
        sys.stdin = dbFile
        key = input()
        while key != ENDDB:
            rec = {}
            field = input()
            while field != ENDREC:
                name,value = field.split(RECSEP)
                rec[name] = eval(value)
                field = input()
            db[key] = rec
            key = input()
        return db

if __name__ == "__main__":
    #storeDbase(person,fileName)
    print(loadDbse(fileName))