python的文件操作和Pick存储模块实例

文件操作

输入：

#!/usr/bin/python

# Filename: using_file.py

poem = '''\Programming is funWhen the work is doneif you wanna make your work also fun: use Python!'''

f = open('poem.txt', 'w')

# open for 'w'riting

f.write(poem)

# write text to file

f.close()

# close the file

f = open('poem.txt')

# if no mode is specified, 'r'ead mode is assumedby default

while True:

line = f.readline()

if len(line) == 0: # Zero length indicates EOF

break

print(line, end='')

f.close()

# close the file

输出：

$ python using_file.py

Programming is fun

When the work is done

if you wanna make your work also fun:

use Python!

解释：

本例中，设计到了文件的读写操作。

首先定义了一个字符串，打开一个文件，将数据存入，保存。

然后打开这个刚才保存的文件，按行输出内容。

Pickle模块

输入：

#!/usr/bin/python

# Filename: pickling.py

import pickle

# the name of the file where we will store the objectshoplistfile = 'shoplist.data'

# the list of things to buy

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

# Write to the file

f = open(shoplistfile, 'wb')

pickle.dump(shoplist, f)

# dump the object to a file

f.close()

del shoplist

# destroy the shoplist variable

# Read back from the storage

输出：

$ python pickling.py

['apple', 'mango', 'carrot']

解释:

Python提供了一个名为 pickle的标准模块，您可以使用它存储任何Python

文件中的对象，然后再将其取回。 这称为持久存储对象。