使用pickle存储数据dump 和 load实例讲解

yipeiwu_com6年前Python基础

使用pickle模块来dump你的数据:对上篇博客里的sketch.txt文件:

import os
import sys
import pickle
 
man=[ ]
other=[ ]
try:
    data=open('sketch.txt')
    for each_line in data:
        try:
            (role,line_spoken)=each_line.split(':',1)
            line_spoken=line_spoken.strip()
            if role == 'Man':
                man.append(line_spoken)
            elif role == 'Other Man':
                other.append(line_spoken)
        except ValueError:
            pass
    data.close()
except IOError:
    nester.print_lol('The data file is missing!')
 
try:
    with open('man_data.txt','wb') as man_file:
      pickle.dump(man,man_file)
    with open('other_data.txt','wb') as other_file:
      pickle.dump(other,other_file)
    
 
 
except IOError as err:
  print('File error: ' + str(err))
except pickle.PickleError as perr:
  print('Pickling error: ' + str(perr))
 

打开man_data.txt,看结果:

?]q (X'  Is this the right room for an argument?qX  No you haven't!qX  When?qX  No you didn't!qX  You didn't!qX  You did not!qX=  Ah! (taking out his wallet and paying) Just the five minutes.qX  You most certainly did not!qX  Oh no you didn't!q X  Oh no you didn't!q
X  Oh look, this isn't an argument!qX  No it isn't!qX  It's just contradiction!q
X  It IS!qX  You just contradicted me!qX  You DID!qX  You did just then!qX"  (exasperated) Oh, this is futile!!qX
  Yes it is!qe.

把已存储在man_data.txt上的二进制文件,恢复成可以读的文件,存放在new_man.txt中:

import nester
import os
import sys
import pickle
 
man=[ ]
other=[ ]
new_man=[ ]
 
try:
    data=open('sketch.txt')
    for each_line in data:
        try:
            (role,line_spoken)=each_line.split(':',1)
            line_spoken=line_spoken.strip()
            if role == 'Man':
                man.append(line_spoken)
            elif role == 'Other Man':
                other.append(line_spoken)
        except ValueError:
            pass
    data.close()
except IOError:
    print_lol('The data file is missing!')
 
try:
#    with open('man_data.txt','wb') as man_file:
#      pickle.dump(man,man_file)
#    with open('other_data.txt','wb') as other_file:
#      pickle.dump(other,other_file)
 
  with open('man_data.txt','rb') as man_file:
    new_man=pickle.load(man_file)
 
except IOError as err:
  print('File error: ' + str(err))
except pickle.PickleError as perr:
  print('Pickling error: ' + str(perr))

查看结果:

 RESTART: C:/Users/ThinkPad/AppData/Local/Programs/Python/Python36-32/chapter4-134-pickle.py 
>>> import nester
>>> nester.print_lol(new_man)
Is this the right room for an argument?
No you haven't!
When?
No you didn't!
You didn't!
You did not!
Ah! (taking out his wallet and paying) Just the five minutes.
You most certainly did not!
Oh no you didn't!
Oh no you didn't!
Oh look, this isn't an argument!
No it isn't!
It's just contradiction!
It IS!
You just contradicted me!
You DID!
You did just then!
(exasperated) Oh, this is futile!!
Yes it is!
>>> import os
>>> os.getcwd()
'C:\\Users\\ThinkPad\\AppData\\Local\\Programs\\Python\\Python36-32'
>>>

若是想保存new_man.txt到磁盘文件,可以加:

  with open('new_man.txt','w') as new_man_file:
    nester.print_lol(new_man,fn=new_man_file)

以上这篇使用pickle存储数据dump 和 load实例讲解就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持【听图阁-专注于Python设计】。

相关文章

使用Python实现正态分布、正态分布采样

使用Python实现正态分布、正态分布采样

多元正态分布(多元高斯分布) 直接从多元正态分布讲起。多元正态分布公式如下: 这就是多元正态分布的定义,均值好理解,就是高斯分布的概率分布值最大的位置,进行采样时也就是采样的中心点。而...

使用python采集脚本之家电子书资源并自动下载到本地的实例脚本

使用python采集脚本之家电子书资源并自动下载到本地的实例脚本

jb51上面的资源还比较全,就准备用python来实现自动采集信息,与下载啦。 Python具有丰富和强大的库,使用urllib,re等就可以轻松开发出一个网络信息采集器! 下面,是我写...

python3 打开外部程序及关闭的示例

如下所示: import os import time import subprocess subprocess.Popen(r'cmd') print('打开成功') time...

详解Python3中的Sequence type的使用

其实本来是要reverse一下list的,就去查了一下list[::-1]是什么意思,发现还有很多要注意的地方,所以就记一下。 主要是参照https://docs.python.org/...

python选择排序算法的实现代码

1.算法:对于一组关键字{K1,K2,…,Kn}, 首先从K1,K2,…,Kn中选择最小值,假如它是 Kz,则将Kz与 K1对换;然后从K2,K3,… ,Kn中选择最小值 Kz,再将Kz...