Python标准库参考笔记-pprint

地址：http://docs.python.org/library/pprint.html

 

以漂亮的格式打印。打印输出可以作为解释器的合法输入。

 

# -*- coding: cp936 -*-

import copy

import pprint

a = [1,2,3,4]

b = [a,a,a,a,a,a,a,a,a]

print '-------------print----------------'

print b

print '-------------pprint----------------'

pprint.pprint(b)

 

运行结果：

>>>

-------------print----------------

[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]]

-------------pprint----------------

[[1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4]]

 

可以控制输出的深度、宽度和缩进，例如：

 

# -*- coding: cp936 -*-

import copy

import pprint

a = [1,2,3,4]

b = [a,a,a,a,a,a,a,a,a]

pp = pprint.PrettyPrinter(indent=4)

print '-------------print----------------'

print b

print '-------------pprint----------------'

pprint.pprint(b)

print '-------------pp.pprint----------------'

pp.pprint(b)

 

结果：

 

>>>

-------------print----------------

[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]]

-------------pprint----------------

[[1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4],

 [1, 2, 3, 4]]

-------------pp.pprint----------------

[   [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4],

    [1, 2, 3, 4]]

 

PyMOTW：

http://www.doughellmann.com/PyMOTW/pprint/index.html