如何从python中的文件处理中的namedtuple中提取数据

Question

在python中的文件处理中无法从namedtuple中提取数据。 它显示在属性对象---位置

from collections import namedtuple 

filename=input("Enter name of file ") 
Data=namedtuple('Data',['name','id','balance']) 

def write(): 
    file=open(filename,'a') 
    name=input("Enter name ") 
    idee=input("Enter ID ") 
    bal=input("Enter balance ") 
    data=Data(name,idee,bal) 
    file.write(str(data)) 
    file.close() 

def read(): 
    file=open(filename,'r') 
    for line in file: 
     print(Data.name,"\t",Data.id,"\t",Data.balance,"\n") 

write() 
write() 
read() 

我应该怎么做data.name提取数据？

Answer 1

将数据写入文件时，它只是一个字符串，读取它时只能得到字符串。

from collections import namedtuple 
import pickle 
filename=input("Enter name of file ") 
Data=namedtuple('Data',['name','id','balance']) 

def write(): 

    name=input("Enter name ") 
    idee=input("Enter ID ") 
    bal=input("Enter balance ") 
    data=Data(name,idee,bal) 
    with open(filename,'ab') as f: 
     pickle.dump(data,f) 

def read(): 
    with open(filename,'rb') as f: 
     while True: 
     try: 
     data=pickle.load(f) 
     print(data.name,"\t",data.id,"\t",data.balance,"\n") 
     except: 
      break 

write() 
write() 
read() 

Answer 2

你可以这样做：

print("%s\t%d\t%s\n" % line) 

打印namedtuple的内容。官方文档可能不是很明显，但是here is a good tutorial to understand named tuples