Python编程中对文件和存储器的读写示例

1.文件的写入和读取

#!/usr/bin/python 
# -*- coding: utf-8 -*- 
# Filename: using_file.py 
# 文件是创建和读取 

s = '''''我们都是木头人， 
不许说话不许动！''' 

# 创建一个文件，并且写入字符 
f = file('test_file.txt', 'w') 
f.write(s) 
f.close() 

# 读取文件，逐行打印 
f = file('test_file.txt') 
while True: 
  line = f.readline() 
  # 如果line长度为0，说明文件已经读完了 
  if len(line) == 0: 
    break 
  # 默认的换行符也读出来了，所以用逗号取代print函数的换行符 
  print line, 
f.close() 

执行结果：

我们都是木头人，
不许说话不许动！

2.存储器的写入和读取

#!/usr/bin/python 
# -*- coding: utf-8 -*- 
# Filename using_pickle.py 
# 使用存储器 

#加载存储器模块，as后面是别名 
#import pickle as p 
#书上说cPickle比pickle快很多 
import cPickle as p 

listpickle = [1, 2, 2, 3] 
picklefile = 'picklefile.data' 

f = file(picklefile, 'w') 
# 写如数据 
p.dump(listpickle, f) 
f.close() 

del listpickle 

f = file(picklefile) 
# 读取数据 
storedlist = p.load(f) 
print storedlist 
f.close() 

执行结果：

[1, 2, 2, 3]

再来看一个使用cPickle储存器存储对象的例子

#!/usr/bin/python 
#Filename:pickling.py 

import cPickle as p 

shoplistfile = 'shoplist.data' 

shoplist = ['apple', 'mango', 'carrot'] 

f = file(shoplistfile, 'w') 
p.dump(shoplist, f) 
f.close() 

del shoplist 

f = file(shoplistfile) 
storedlist = p.load(f) 
print storedlist