Python学习日记－1

def input(prompt):
    return (eval(raw_input(prompt)))

dbfilename = 'people-file'  
 
ENDDB = 'enddb.' 
 
ENDREC = 'endrec.' 
 
RECSEP = '=>' 
 
  
 
def storeDbase(db, dbfilenamedbfilename=dbfilename):  ＃加载dict数据到文件
 
    "formatted dump of database to flat file" 
 
    dbfile=open(dbfilename,'w')                       ＃文件打开函数open（），w代表写操作
 
    for key in db: 
 
        dbfile.write(key+'\n')                        ＃文件写操作。不带换行符
 
        for(name,value) in db[key].items():           
 
            dbfile.write(name+RECSEP+repr(value)+'\n') ＃repr函数代表取得字符串规范表示。反引号同样的作用
 
        dbfile.write(ENDREC+'\n') 
 
    dbfile.write(ENDDB+'\n') 
 
    dbfile.close() 
 
     
 
def loadDbase(dbfilenamedbfilename=dbfilename):  ＃读取文件数据到dict函数
 
    "parse data to reconstruct database" 
 
    dbfile = open(dbfilename)                    ＃默认关键字为‘r’
 
    import sys 
 
    sys.stdin = dbfile                           ＃sys.stdin 系统输入       
 
    db = {}                                      ＃定义dict
 
    key = raw_input()                              
 
    while key != ENDDB: 
 
        rec = {} 
 
        field = raw_input() 
 
        while field != ENDREC: 
 
            name,value = field.split(RECSEP)             ＃split函数以括号内符号分割字符串
 
            rec[name] = eval(value) 
 
            field = raw_input() 
 
        print rec 
 
        db[key] = rec 
 
        key = raw_input() 
 
    return db 
 
  
 
if __name__ == '__main__':  
 
    storeDbase(db) 
 
    db1=loadDbase() 
 
    db1['tom']['name']='Tom Tomson' 
 
    storeDbase(db1)